diff --git a/README.md b/README.md
index 204f8c9a..736ff5cc 100644
--- a/README.md
+++ b/README.md
@@ -178,7 +178,7 @@ Now you should be able to build or run any of the examples:
 The version program should output the following:
 
 		gocv version: 0.2.0
-		opencv lib version: 3.3.1
+		opencv lib version: 3.4.0
 
 You might want to copy the `env.sh` script into your own projects, to make it easier to setup these vars when building your own code.
 
@@ -236,7 +236,7 @@ Now you should be able to build or run any of the command examples:
 The version program should output the following:
 
 		gocv version: 0.2.0
-		opencv lib version: 3.3.1
+		opencv lib version: 3.4.0
 
 You might want to copy the `env.sh` script into your own projects, to make it easier to setup these vars when building your own code.
 
@@ -260,13 +260,13 @@ Download and install CMake [https://cmake.org/download/](https://cmake.org/downl
 
 #### Download OpenCV 3.3 and OpenCV Contrib Modules
 
-Download the source code for the latest OpenCV release from [https://github.com/opencv/opencv/archive/3.3.1.zip](https://github.com/opencv/opencv/archive/3.3.1.zip) and extract it to the directory `C:\opencv\opencv-3.3.1`
+Download the source code for the latest OpenCV release from [https://github.com/opencv/opencv/archive/3.4.0.zip](https://github.com/opencv/opencv/archive/3.4.0.zip) and extract it to the directory `C:\opencv\opencv-3.4.0`
 
-Download the source code for the latest OpenCV Contrib release from [https://github.com/opencv/opencv_contrib/archive/3.3.1.zip](https://github.com/opencv/opencv_contrib/archive/3.3.1.zip) and extract it to the directory `C:\opencv\opencv_contrib-3.3.1`
+Download the source code for the latest OpenCV Contrib release from [https://github.com/opencv/opencv_contrib/archive/3.4.0.zip](https://github.com/opencv/opencv_contrib/archive/3.4.0.zip) and extract it to the directory `C:\opencv\opencv_contrib-3.4.0`
 
 Create the directory `C:\opencv\build` as the build directory.
 
-Now launch the `cmake-gui` program, and set the "Where is the source code" to `C:\opencv\opencv-3.3.1`, and the "Where to build the binaries" to `C:\opencv\build`.
+Now launch the `cmake-gui` program, and set the "Where is the source code" to `C:\opencv\opencv-3.4.0`, and the "Where to build the binaries" to `C:\opencv\build`.
 
 Click on "Configure" and select "MinGW MakeFile" from the window, then click on the  "Next" button.
 
@@ -278,7 +278,7 @@ Now, scroll down the list and change the following settings as follows:
 - `BUILD_PERF_TESTS` should be unchecked (aka disabled).
 - `ENABLE_PRECOMPILED_HEADERS` should be unchecked.
 - `ENABLE_CXX11` should be checked.
-- `OPENCV_EXTRA_MODULES_PATH` should be set to `C:\opencv\opencv_contrib-3.3.1\modules`
+- `OPENCV_EXTRA_MODULES_PATH` should be set to `C:\opencv\opencv_contrib-3.4.0\modules`
 
 Click on the "Configure" button again, and wait for the configuration step.
 
@@ -307,7 +307,7 @@ You should now have OpenCV 3.3 installed on your Windows 10 machine.
 Run these commands to configure Go to know about the include and lib directories:
 
 		set CGO_CPPFLAGS=-IC:\opencv\build\install\include
-		set CGO_LDFLAGS=-LC:\opencv\build\install\x64\mingw\lib -lopencv_core331 -lopencv_videoio331 -lopencv_imgproc331 -lopencv_highgui331 -lopencv_imgcodecs331 -lopencv_objdetect331 -lopencv_calib3d331 -lopencv_video331 -lopencv_xfeatures2d331 -lopencv_face331
+		set CGO_LDFLAGS=-LC:\opencv\build\install\x64\mingw\lib -lopencv_core340 -lopencv_videoio340 -lopencv_imgproc340 -lopencv_highgui340 -lopencv_imgcodecs340 -lopencv_objdetect340 -lopencv_calib3d340 -lopencv_video340 -lopencv_xfeatures2d340 -lopencv_face340
 
 Now you should be able to build or run any of the command examples:
 
@@ -316,7 +316,7 @@ Now you should be able to build or run any of the command examples:
 The version program should output the following:
 
 		gocv version: 0.2.0
-		opencv lib version: 3.3.1
+		opencv lib version: 3.4.0
 
 ## How to contribute
 
diff --git a/contrib/face.go b/contrib/face.go
index 823f55ae..4c187c2a 100644
--- a/contrib/face.go
+++ b/contrib/face.go
@@ -6,8 +6,9 @@ package contrib
 */
 import "C"
 import (
-	"gocv.io/x/gocv"
 	"unsafe"
+
+	"gocv.io/x/gocv"
 )
 
 type PredictResponse struct {
@@ -21,7 +22,7 @@ type LBPHFaceRecognizer struct {
 
 // Create new LBPH Recognizer model
 //
-// see https://docs.opencv.org/3.3.1/df/d25/classcv_1_1face_1_1LBPHFaceRecognizer.html
+// see https://docs.opencv.org/3.4.0/df/d25/classcv_1_1face_1_1LBPHFaceRecognizer.html
 //
 func NewLBPHFaceRecognizer() *LBPHFaceRecognizer {
 	return &LBPHFaceRecognizer{p: C.CreateLBPHFaceRecognizer()}
@@ -29,7 +30,7 @@ func NewLBPHFaceRecognizer() *LBPHFaceRecognizer {
 
 // Train loaded model with images and their labels
 //
-// see https://docs.opencv.org/3.3.1/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#ac8680c2aa9649ad3f55e27761165c0d6
+// see https://docs.opencv.org/3.4.0/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#ac8680c2aa9649ad3f55e27761165c0d6
 //
 func (fr *LBPHFaceRecognizer) Train(images []gocv.Mat, labels []int) {
 	cparams := []C.int{}
@@ -54,7 +55,7 @@ func (fr *LBPHFaceRecognizer) Train(images []gocv.Mat, labels []int) {
 
 // update existing trained model with new images and labels
 //
-// see https://docs.opencv.org/3.3.1/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#a8a4e73ea878dcd0c235d0487189d25f3
+// see https://docs.opencv.org/3.4.0/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#a8a4e73ea878dcd0c235d0487189d25f3
 //
 func (fr *LBPHFaceRecognizer) Update(newImages []gocv.Mat, newLabels []int) {
 	cparams := []C.int{}
@@ -79,7 +80,7 @@ func (fr *LBPHFaceRecognizer) Update(newImages []gocv.Mat, newLabels []int) {
 
 // predict image for trained model, retun label for correctly predicted image, return -1 if not found
 //
-// see https://docs.opencv.org/3.3.1/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#aa2d2f02faffab1bf01317ae6502fb631
+// see https://docs.opencv.org/3.4.0/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#aa2d2f02faffab1bf01317ae6502fb631
 //
 func (fr *LBPHFaceRecognizer) Predict(sample gocv.Mat) int {
 	label := C.LBPHFaceRecognizer_Predict(fr.p, (C.Mat)(sample.Ptr()))
@@ -89,7 +90,7 @@ func (fr *LBPHFaceRecognizer) Predict(sample gocv.Mat) int {
 
 // the same as above but returns some more info
 //
-// see https://docs.opencv.org/3.3.1/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#ab0d593e53ebd9a0f350c989fcac7f251
+// see https://docs.opencv.org/3.4.0/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#ab0d593e53ebd9a0f350c989fcac7f251
 //
 func (fr *LBPHFaceRecognizer) PredictExtendedResponse(sample gocv.Mat) PredictResponse {
 	respp := C.LBPHFaceRecognizer_PredictExtended(fr.p, (C.Mat)(sample.Ptr()))
@@ -103,7 +104,7 @@ func (fr *LBPHFaceRecognizer) PredictExtendedResponse(sample gocv.Mat) PredictRe
 
 // set Threshold value
 //
-// see https://docs.opencv.org/3.3.1/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#a3182081e5f8023e658ad8ab96656dd63
+// see https://docs.opencv.org/3.4.0/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#a3182081e5f8023e658ad8ab96656dd63
 //
 func (fr *LBPHFaceRecognizer) SetThreshold(threshold float32) {
 	C.LBPHFaceRecognizer_SetThreshold(fr.p, (C.double)(threshold))
@@ -111,7 +112,7 @@ func (fr *LBPHFaceRecognizer) SetThreshold(threshold float32) {
 
 // set Neighbors
 //
-// see https://docs.opencv.org/3.3.1/df/d25/classcv_1_1face_1_1LBPHFaceRecognizer.html#ab225f7bf353ce8697a506eda10124a92
+// see https://docs.opencv.org/3.4.0/df/d25/classcv_1_1face_1_1LBPHFaceRecognizer.html#ab225f7bf353ce8697a506eda10124a92
 // wrong neighbors can raise opencv exception!
 //
 func (fr *LBPHFaceRecognizer) SetNeighbors(neighbors int) {
@@ -120,7 +121,7 @@ func (fr *LBPHFaceRecognizer) SetNeighbors(neighbors int) {
 
 // get Neighbors
 //
-// see https://docs.opencv.org/3.3.1/df/d25/classcv_1_1face_1_1LBPHFaceRecognizer.html#a50a3e2ca6e8464166e153c9df84b0a77
+// see https://docs.opencv.org/3.4.0/df/d25/classcv_1_1face_1_1LBPHFaceRecognizer.html#a50a3e2ca6e8464166e153c9df84b0a77
 //
 func (fr *LBPHFaceRecognizer) GetNeighbors() int {
 	n := C.LBPHFaceRecognizer_GetNeighbors(fr.p)
@@ -130,7 +131,7 @@ func (fr *LBPHFaceRecognizer) GetNeighbors() int {
 
 // set Radius
 //
-// see https://docs.opencv.org/3.3.1/df/d25/classcv_1_1face_1_1LBPHFaceRecognizer.html#a62d94c75cade902fd3b487b1ef9883fc
+// see https://docs.opencv.org/3.4.0/df/d25/classcv_1_1face_1_1LBPHFaceRecognizer.html#a62d94c75cade902fd3b487b1ef9883fc
 //
 func (fr *LBPHFaceRecognizer) SetRadius(radius int) {
 	C.LBPHFaceRecognizer_SetRadius(fr.p, (C.int)(radius))
@@ -138,7 +139,7 @@ func (fr *LBPHFaceRecognizer) SetRadius(radius int) {
 
 // save trained model data to file
 //
-// see https://docs.opencv.org/3.3.1/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#a2adf2d555550194244b05c91fefcb4d6
+// see https://docs.opencv.org/3.4.0/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#a2adf2d555550194244b05c91fefcb4d6
 //
 func (fr *LBPHFaceRecognizer) SaveFile(fname string) {
 	cName := C.CString(fname)
@@ -148,7 +149,7 @@ func (fr *LBPHFaceRecognizer) SaveFile(fname string) {
 
 // load traned model data from file
 //
-// see https://docs.opencv.org/3.3.1/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#acc42e5b04595dba71f0777c7179af8c3
+// see https://docs.opencv.org/3.4.0/dd/d65/classcv_1_1face_1_1FaceRecognizer.html#acc42e5b04595dba71f0777c7179af8c3
 //
 func (fr *LBPHFaceRecognizer) LoadFile(fname string) {
 	cName := C.CString(fname)
diff --git a/contrib/xfeatures2d.go b/contrib/xfeatures2d.go
index fe98373e..091faed4 100644
--- a/contrib/xfeatures2d.go
+++ b/contrib/xfeatures2d.go
@@ -22,7 +22,7 @@ type SIFT struct {
 // NewSIFT returns a new SIFT algorithm.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d5/d3c/classcv_1_1xfeatures2d_1_1SIFT.html
+// https://docs.opencv.org/3.4.0/d5/d3c/classcv_1_1xfeatures2d_1_1SIFT.html
 //
 func NewSIFT() SIFT {
 	return SIFT{p: unsafe.Pointer(C.SIFT_Create())}
@@ -38,7 +38,7 @@ func (d *SIFT) Close() error {
 // Detect keypoints in an image using SIFT.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
 //
 func (d *SIFT) Detect(src gocv.Mat) []gocv.KeyPoint {
 	ret := C.SIFT_Detect((C.SIFT)(d.p), C.Mat(src.Ptr()))
@@ -50,7 +50,7 @@ func (d *SIFT) Detect(src gocv.Mat) []gocv.KeyPoint {
 // DetectAndCompute detects and computes keypoints in an image using SIFT.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#a8be0d1c20b08eb867184b8d74c15a677
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#a8be0d1c20b08eb867184b8d74c15a677
 //
 func (d *SIFT) DetectAndCompute(src gocv.Mat, mask gocv.Mat) ([]gocv.KeyPoint, gocv.Mat) {
 	desc := gocv.NewMat()
@@ -70,7 +70,7 @@ type SURF struct {
 // NewSURF returns a new SURF algorithm.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d5/df7/classcv_1_1xfeatures2d_1_1SURF.html
+// https://docs.opencv.org/3.4.0/d5/df7/classcv_1_1xfeatures2d_1_1SURF.html
 //
 func NewSURF() SURF {
 	return SURF{p: unsafe.Pointer(C.SURF_Create())}
@@ -86,7 +86,7 @@ func (d *SURF) Close() error {
 // Detect keypoints in an image using SURF.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
 //
 func (d *SURF) Detect(src gocv.Mat) []gocv.KeyPoint {
 	ret := C.SURF_Detect((C.SURF)(d.p), C.Mat(src.Ptr()))
@@ -98,7 +98,7 @@ func (d *SURF) Detect(src gocv.Mat) []gocv.KeyPoint {
 // DetectAndCompute detects and computes keypoints in an image using SURF.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#a8be0d1c20b08eb867184b8d74c15a677
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#a8be0d1c20b08eb867184b8d74c15a677
 //
 func (d *SURF) DetectAndCompute(src gocv.Mat, mask gocv.Mat) ([]gocv.KeyPoint, gocv.Mat) {
 	desc := gocv.NewMat()
diff --git a/core.go b/core.go
index 1bf92683..66b96354 100644
--- a/core.go
+++ b/core.go
@@ -68,7 +68,7 @@ const (
 // vector fields, point clouds, tensors, and histograms.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d3/d63/classcv_1_1Mat.html
+// http://docs.opencv.org/3.4.0/d3/d63/classcv_1_1Mat.html
 //
 type Mat struct {
 	p C.Mat
@@ -152,7 +152,7 @@ func (m *Mat) Mean() Scalar {
 // Indices of the entries are taken from the input array.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#gab55b8d062b7f5587720ede032d34156f
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#gab55b8d062b7f5587720ede032d34156f
 func LUT(src, wbLUT, dst Mat) {
 	C.LUT(src.p, wbLUT.p, dst.p)
 }
@@ -243,7 +243,7 @@ func (m *Mat) SetDoubleAt(row int, col int, val float64) {
 // or between an array and a scalar.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#ga6fef31bc8c4071cbc114a758a2b79c14
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#ga6fef31bc8c4071cbc114a758a2b79c14
 //
 func AbsDiff(src1 Mat, src2 Mat, dst Mat) {
 	C.Mat_AbsDiff(src1.p, src2.p, dst.p)
@@ -252,7 +252,7 @@ func AbsDiff(src1 Mat, src2 Mat, dst Mat) {
 // Add calculates the per-element sum of two arrays or an array and a scalar.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#ga10ac1bfb180e2cfda1701d06c24fdbd6
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#ga10ac1bfb180e2cfda1701d06c24fdbd6
 //
 func Add(src1 Mat, src2 Mat, dst Mat) {
 	C.Mat_Add(src1.p, src2.p, dst.p)
@@ -261,7 +261,7 @@ func Add(src1 Mat, src2 Mat, dst Mat) {
 // AddWeighted calculates the weighted sum of two arrays.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#gafafb2513349db3bcff51f54ee5592a19
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#gafafb2513349db3bcff51f54ee5592a19
 //
 func AddWeighted(src1 Mat, alpha float64, src2 Mat, beta float64, gamma float64, dst Mat) {
 	C.Mat_AddWeighted(src1.p, C.double(alpha),
@@ -273,7 +273,7 @@ func AddWeighted(src1 Mat, alpha float64, src2 Mat, beta float64, gamma float64,
 // or an array and a scalar.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#ga60b4d04b251ba5eb1392c34425497e14
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#ga60b4d04b251ba5eb1392c34425497e14
 //
 func BitwiseAnd(src1 Mat, src2 Mat, dst Mat) {
 	C.Mat_BitwiseAnd(src1.p, src2.p, dst.p)
@@ -282,7 +282,7 @@ func BitwiseAnd(src1 Mat, src2 Mat, dst Mat) {
 // BitwiseNot inverts every bit of an array.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#ga0002cf8b418479f4cb49a75442baee2f
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#ga0002cf8b418479f4cb49a75442baee2f
 //
 func BitwiseNot(src1 Mat, dst Mat) {
 	C.Mat_BitwiseNot(src1.p, dst.p)
@@ -292,7 +292,7 @@ func BitwiseNot(src1 Mat, dst Mat) {
 // or an array and a scalar.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#gab85523db362a4e26ff0c703793a719b4
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#gab85523db362a4e26ff0c703793a719b4
 //
 func BitwiseOr(src1 Mat, src2 Mat, dst Mat) {
 	C.Mat_BitwiseOr(src1.p, src2.p, dst.p)
@@ -302,7 +302,7 @@ func BitwiseOr(src1 Mat, src2 Mat, dst Mat) {
 // on two arrays or an array and a scalar.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#ga84b2d8188ce506593dcc3f8cd00e8e2c
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#ga84b2d8188ce506593dcc3f8cd00e8e2c
 //
 func BitwiseXor(src1 Mat, src2 Mat, dst Mat) {
 	C.Mat_BitwiseXor(src1.p, src2.p, dst.p)
@@ -311,7 +311,7 @@ func BitwiseXor(src1 Mat, src2 Mat, dst Mat) {
 // InRange checks if array elements lie between the elements of two Mat arrays.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#ga48af0ab51e36436c5d04340e036ce981
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#ga48af0ab51e36436c5d04340e036ce981
 //
 func InRange(src Mat, lb Mat, ub Mat, dst Mat) {
 	C.Mat_InRange(src.p, lb.p, ub.p, dst.p)
@@ -321,7 +321,7 @@ func InRange(src Mat, lb Mat, ub Mat, dst Mat) {
 // for a given vector size.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#ga6577a2e59968936ae02eb2edde5de299
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#ga6577a2e59968936ae02eb2edde5de299
 //
 func GetOptimalDFTSize(vecsize int) int {
 	return int(C.Mat_GetOptimalDFTSize(C.int(vecsize)))
@@ -331,7 +331,7 @@ func GetOptimalDFTSize(vecsize int) int {
 // of a 1D or 2D floating-point array.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#gadd6cf9baf2b8b704a11b5f04aaf4f39d
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#gadd6cf9baf2b8b704a11b5f04aaf4f39d
 //
 func DFT(src Mat, dst Mat) {
 	C.Mat_DFT(src.p, dst.p)
@@ -340,7 +340,7 @@ func DFT(src Mat, dst Mat) {
 // Merge creates one multi-channel array out of several single-channel ones.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#ga7d7b4d6c6ee504b30a20b1680029c7b4
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#ga7d7b4d6c6ee504b30a20b1680029c7b4
 //
 func Merge(mv []Mat, dst Mat) {
 	cMatArray := make([]C.Mat, len(mv))
@@ -358,7 +358,7 @@ func Merge(mv []Mat, dst Mat) {
 // NormType for normalization operations.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#gad12cefbcb5291cf958a85b4b67b6149f
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#gad12cefbcb5291cf958a85b4b67b6149f
 //
 type NormType int
 
@@ -377,7 +377,7 @@ const (
 // Normalize normalizes the norm or value range of an array.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#ga87eef7ee3970f86906d69a92cbf064bd
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#ga87eef7ee3970f86906d69a92cbf064bd
 //
 func Normalize(src Mat, dst Mat, alpha float64, beta float64, typ NormType) {
 	C.Mat_Normalize(src.p, dst.p, C.double(alpha), C.double(beta), C.int(typ))
@@ -386,7 +386,7 @@ func Normalize(src Mat, dst Mat, alpha float64, beta float64, typ NormType) {
 // Norm calculates the absolute norm of an array.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/de8/group__core__array.html#ga7c331fb8dd951707e184ef4e3f21dd33
+// https://docs.opencv.org/3.4.0/d2/de8/group__core__array.html#ga7c331fb8dd951707e184ef4e3f21dd33
 //
 func Norm(src1 Mat, normType NormType) float64 {
 	return float64(C.Norm(src1.p, C.int(normType)))
@@ -395,7 +395,7 @@ func Norm(src1 Mat, normType NormType) float64 {
 // TermCriteriaType for TermCriteria.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d9/d5d/classcv_1_1TermCriteria.html#a56fecdc291ccaba8aad27d67ccf72c57
+// https://docs.opencv.org/3.4.0/d9/d5d/classcv_1_1TermCriteria.html#a56fecdc291ccaba8aad27d67ccf72c57
 //
 type TermCriteriaType int
 
@@ -414,7 +414,7 @@ const (
 // TermCriteria is the criteria for iterative algorithms.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d9/d5d/classcv_1_1TermCriteria.html
+// https://docs.opencv.org/3.4.0/d9/d5d/classcv_1_1TermCriteria.html
 //
 type TermCriteria struct {
 	p C.TermCriteria
@@ -428,7 +428,7 @@ func NewTermCriteria(typ TermCriteriaType, maxCount int, epsilon float64) TermCr
 // Scalar is a 4-element vector widely used in OpenCV to pass pixel values.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d1/da0/classcv_1_1Scalar__.html
+// http://docs.opencv.org/3.4.0/d1/da0/classcv_1_1Scalar__.html
 //
 type Scalar struct {
 	Val1 float64
@@ -446,7 +446,7 @@ func NewScalar(v1 float64, v2 float64, v3 float64, v4 float64) Scalar {
 // KeyPoint is data structure for salient point detectors.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d2/d29/classcv_1_1KeyPoint.html
+// https://docs.opencv.org/3.4.0/d2/d29/classcv_1_1KeyPoint.html
 //
 type KeyPoint struct {
 	X, Y                  float64
diff --git a/features2d.go b/features2d.go
index 1f3565ae..4220cc8d 100644
--- a/features2d.go
+++ b/features2d.go
@@ -19,7 +19,7 @@ type AKAZE struct {
 // NewAKAZE returns a new AKAZE algorithm
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d8/d30/classcv_1_1AKAZE.html
+// https://docs.opencv.org/3.4.0/d8/d30/classcv_1_1AKAZE.html
 //
 func NewAKAZE() AKAZE {
 	return AKAZE{p: unsafe.Pointer(C.AKAZE_Create())}
@@ -35,7 +35,7 @@ func (a *AKAZE) Close() error {
 // Detect keypoints in an image using AKAZE.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
 //
 func (a *AKAZE) Detect(src Mat) []KeyPoint {
 	ret := C.AKAZE_Detect((C.AKAZE)(a.p), src.p)
@@ -47,7 +47,7 @@ func (a *AKAZE) Detect(src Mat) []KeyPoint {
 // Detect keypoints and compute in an image using AKAZE.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#a8be0d1c20b08eb867184b8d74c15a677
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#a8be0d1c20b08eb867184b8d74c15a677
 //
 func (a *AKAZE) DetectAndCompute(src Mat, mask Mat) ([]KeyPoint, Mat) {
 	desc := NewMat()
@@ -66,7 +66,7 @@ type AgastFeatureDetector struct {
 // NewAgastFeatureDetector returns a new AgastFeatureDetector algorithm
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/d19/classcv_1_1AgastFeatureDetector.html
+// https://docs.opencv.org/3.4.0/d7/d19/classcv_1_1AgastFeatureDetector.html
 //
 func NewAgastFeatureDetector() AgastFeatureDetector {
 	return AgastFeatureDetector{p: unsafe.Pointer(C.AgastFeatureDetector_Create())}
@@ -82,7 +82,7 @@ func (a *AgastFeatureDetector) Close() error {
 // Detect keypoints in an image using AgastFeatureDetector.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
 //
 func (a *AgastFeatureDetector) Detect(src Mat) []KeyPoint {
 	ret := C.AgastFeatureDetector_Detect((C.AgastFeatureDetector)(a.p), src.p)
@@ -100,7 +100,7 @@ type BRISK struct {
 // NewBRISK returns a new BRISK algorithm
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d8/d30/classcv_1_1AKAZE.html
+// https://docs.opencv.org/3.4.0/d8/d30/classcv_1_1AKAZE.html
 //
 func NewBRISK() BRISK {
 	return BRISK{p: unsafe.Pointer(C.BRISK_Create())}
@@ -116,7 +116,7 @@ func (b *BRISK) Close() error {
 // Detect keypoints in an image using BRISK.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
 //
 func (b *BRISK) Detect(src Mat) []KeyPoint {
 	ret := C.BRISK_Detect((C.BRISK)(b.p), src.p)
@@ -128,7 +128,7 @@ func (b *BRISK) Detect(src Mat) []KeyPoint {
 // Detect keypoints and compute in an image using BRISK.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#a8be0d1c20b08eb867184b8d74c15a677
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#a8be0d1c20b08eb867184b8d74c15a677
 //
 func (b *BRISK) DetectAndCompute(src Mat, mask Mat) ([]KeyPoint, Mat) {
 	desc := NewMat()
@@ -147,7 +147,7 @@ type FastFeatureDetector struct {
 // NewFastFeatureDetector returns a new FastFeatureDetector algorithm
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/df/d74/classcv_1_1FastFeatureDetector.html
+// https://docs.opencv.org/3.4.0/df/d74/classcv_1_1FastFeatureDetector.html
 //
 func NewFastFeatureDetector() FastFeatureDetector {
 	return FastFeatureDetector{p: unsafe.Pointer(C.FastFeatureDetector_Create())}
@@ -163,7 +163,7 @@ func (f *FastFeatureDetector) Close() error {
 // Detect keypoints in an image using FastFeatureDetector.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
 //
 func (f *FastFeatureDetector) Detect(src Mat) []KeyPoint {
 	ret := C.FastFeatureDetector_Detect((C.FastFeatureDetector)(f.p), src.p)
@@ -181,7 +181,7 @@ type ORB struct {
 // NewORB returns a new ORB algorithm
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/d19/classcv_1_1AgastFeatureDetector.html
+// https://docs.opencv.org/3.4.0/d7/d19/classcv_1_1AgastFeatureDetector.html
 //
 func NewORB() ORB {
 	return ORB{p: unsafe.Pointer(C.ORB_Create())}
@@ -197,7 +197,7 @@ func (o *ORB) Close() error {
 // Detect keypoints in an image using ORB.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
 //
 func (o *ORB) Detect(src Mat) []KeyPoint {
 	ret := C.ORB_Detect((C.ORB)(o.p), src.p)
@@ -209,7 +209,7 @@ func (o *ORB) Detect(src Mat) []KeyPoint {
 // Detect keypoints and compute in an image using ORB.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#a8be0d1c20b08eb867184b8d74c15a677
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#a8be0d1c20b08eb867184b8d74c15a677
 //
 func (o *ORB) DetectAndCompute(src Mat, mask Mat) ([]KeyPoint, Mat) {
 	desc := NewMat()
@@ -228,7 +228,7 @@ type SimpleBlobDetector struct {
 // NewSimpleBlobDetector returns a new SimpleBlobDetector algorithm
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d7a/classcv_1_1SimpleBlobDetector.html
+// https://docs.opencv.org/3.4.0/d0/d7a/classcv_1_1SimpleBlobDetector.html
 //
 func NewSimpleBlobDetector() SimpleBlobDetector {
 	return SimpleBlobDetector{p: unsafe.Pointer(C.SimpleBlobDetector_Create())}
@@ -244,7 +244,7 @@ func (b *SimpleBlobDetector) Close() error {
 // Detect keypoints in an image using SimpleBlobDetector.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
+// https://docs.opencv.org/3.4.0/d0/d13/classcv_1_1Feature2D.html#aa4e9a7082ec61ebc108806704fbd7887
 //
 func (b *SimpleBlobDetector) Detect(src Mat) []KeyPoint {
 	ret := C.SimpleBlobDetector_Detect((C.SimpleBlobDetector)(b.p), src.p)
diff --git a/gocv.go b/gocv.go
index f39fd136..caee52a9 100644
--- a/gocv.go
+++ b/gocv.go
@@ -6,6 +6,6 @@
 // computer vision algorithms.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d1/dfb/intro.html
+// http://docs.opencv.org/3.4.0/d1/dfb/intro.html
 //
 package gocv // import "gocv.io/x/gocv"
diff --git a/highgui.go b/highgui.go
index 3804f4fc..d1c50aa1 100644
--- a/highgui.go
+++ b/highgui.go
@@ -19,7 +19,7 @@ import (
 // quickly and visualize the results. This is what the HighGUI module has been designed for.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html
+// http://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html
 //
 type Window struct {
 	name string
@@ -29,7 +29,7 @@ type Window struct {
 // NewWindow creates a new named OpenCV window
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b
+// http://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b
 //
 func NewWindow(name string) *Window {
 	runtime.LockOSThread()
@@ -45,7 +45,7 @@ func NewWindow(name string) *Window {
 // Close closes and deletes a named OpenCV Window.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga851ccdd6961022d1d5b4c4f255dbab34
+// http://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga851ccdd6961022d1d5b4c4f255dbab34
 //
 func (w *Window) Close() error {
 	cName := C.CString(w.name)
@@ -100,7 +100,7 @@ const (
 // GetWindowProperty returns properties of a window.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#gaaf9504b8f9cf19024d9d44a14e461656
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#gaaf9504b8f9cf19024d9d44a14e461656
 //
 func (w *Window) GetWindowProperty(flag WindowPropertyFlag) float64 {
 	cName := C.CString(w.name)
@@ -112,7 +112,7 @@ func (w *Window) GetWindowProperty(flag WindowPropertyFlag) float64 {
 // SetWindowProperty changes parameters of a window dynamically.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga66e4a6db4d4e06148bcdfe0d70a5df27
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga66e4a6db4d4e06148bcdfe0d70a5df27
 //
 func (w *Window) SetWindowProperty(flag WindowPropertyFlag, value WindowFlag) {
 	cName := C.CString(w.name)
@@ -124,7 +124,7 @@ func (w *Window) SetWindowProperty(flag WindowPropertyFlag, value WindowFlag) {
 // SetWindowTitle updates window title.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga56f8849295fd10d0c319724ddb773d96
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga56f8849295fd10d0c319724ddb773d96
 //
 func (w *Window) SetWindowTitle(title string) {
 	cName := C.CString(w.name)
@@ -141,7 +141,7 @@ func (w *Window) SetWindowTitle(title string) {
 // the image for specified milliseconds. Otherwise, it won't display the image.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563
+// http://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563
 //
 func (w *Window) IMShow(img Mat) {
 	cName := C.CString(w.name)
@@ -156,7 +156,7 @@ func (w *Window) IMShow(img Mat) {
 // for normal event processing
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7
+// http://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7
 //
 func (w *Window) WaitKey(delay int) int {
 	return int(C.Window_WaitKey(C.int(delay)))
@@ -165,7 +165,7 @@ func (w *Window) WaitKey(delay int) int {
 // MoveWindow moves window to the specified position.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga8d86b207f7211250dbe6e28f76307ffb
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga8d86b207f7211250dbe6e28f76307ffb
 //
 func (w *Window) MoveWindow(x, y int) {
 	cName := C.CString(w.name)
@@ -177,7 +177,7 @@ func (w *Window) MoveWindow(x, y int) {
 // ResizeWindow resizes window to the specified size.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga9e80e080f7ef33f897e415358aee7f7e
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga9e80e080f7ef33f897e415358aee7f7e
 //
 func (w *Window) ResizeWindow(width, height int) {
 	cName := C.CString(w.name)
@@ -194,7 +194,7 @@ func (w *Window) ResizeWindow(width, height int) {
 // use key c to cancel selection (function will return a zero Rect).
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga8daf4730d3adf7035b6de9be4c469af5
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga8daf4730d3adf7035b6de9be4c469af5
 //
 func SelectROI(name string, img Mat) image.Rectangle {
 	cName := C.CString(name)
@@ -213,7 +213,7 @@ func SelectROI(name string, img Mat) image.Rectangle {
 // use esc to terminate multiple ROI selection process
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga0f11fad74a6432b8055fb21621a0f893
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga0f11fad74a6432b8055fb21621a0f893
 //
 func SelectROIs(name string, img Mat) []image.Rectangle {
 	cName := C.CString(name)
@@ -254,7 +254,7 @@ type Trackbar struct {
 // CreateTrackbar creates a trackbar and attaches it to the specified window.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#gaf78d2155d30b728fc413803745b67a9b
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#gaf78d2155d30b728fc413803745b67a9b
 //
 func (w *Window) CreateTrackbar(name string, max int) *Trackbar {
 	cName := C.CString(w.name)
@@ -270,7 +270,7 @@ func (w *Window) CreateTrackbar(name string, max int) *Trackbar {
 // GetPos returns the trackbar position.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga122632e9e91b9ec06943472c55d9cda8
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga122632e9e91b9ec06943472c55d9cda8
 //
 func (t *Trackbar) GetPos() int {
 	cName := C.CString(t.parent.name)
@@ -285,7 +285,7 @@ func (t *Trackbar) GetPos() int {
 // SetPos sets the trackbar position.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga67d73c4c9430f13481fd58410d01bd8d
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga67d73c4c9430f13481fd58410d01bd8d
 //
 func (t *Trackbar) SetPos(pos int) {
 	cName := C.CString(t.parent.name)
@@ -300,7 +300,7 @@ func (t *Trackbar) SetPos(pos int) {
 // SetMin sets the trackbar minimum position.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#gabe26ffe8d2b60cc678895595a581b7aa
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#gabe26ffe8d2b60cc678895595a581b7aa
 //
 func (t *Trackbar) SetMin(pos int) {
 	cName := C.CString(t.parent.name)
@@ -315,7 +315,7 @@ func (t *Trackbar) SetMin(pos int) {
 // SetMax sets the trackbar maximum position.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/dfc/group__highgui.html#ga7e5437ccba37f1154b65210902fc4480
+// https://docs.opencv.org/3.4.0/d7/dfc/group__highgui.html#ga7e5437ccba37f1154b65210902fc4480
 //
 func (t *Trackbar) SetMax(pos int) {
 	cName := C.CString(t.parent.name)
diff --git a/imgcodecs.go b/imgcodecs.go
index e89251ea..a4832939 100644
--- a/imgcodecs.go
+++ b/imgcodecs.go
@@ -124,7 +124,7 @@ const (
 // unsupported or invalid format), the function returns an empty Mat.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d4/da8/group__imgcodecs.html#ga288b8b3da0892bd651fce07b3bbd3a56
+// http://docs.opencv.org/3.4.0/d4/da8/group__imgcodecs.html#ga288b8b3da0892bd651fce07b3bbd3a56
 //
 func IMRead(name string, flags IMReadFlag) Mat {
 	cName := C.CString(name)
@@ -136,7 +136,7 @@ func IMRead(name string, flags IMReadFlag) Mat {
 // IMWrite writes a Mat to an image file.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d4/da8/group__imgcodecs.html#gabbc7ef1aa2edfaa87772f1202d67e0ce
+// http://docs.opencv.org/3.4.0/d4/da8/group__imgcodecs.html#gabbc7ef1aa2edfaa87772f1202d67e0ce
 //
 func IMWrite(name string, img Mat) bool {
 	cName := C.CString(name)
@@ -149,7 +149,7 @@ func IMWrite(name string, img Mat) bool {
 // With that func you can pass compression parameters
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d4/da8/group__imgcodecs.html#gabbc7ef1aa2edfaa87772f1202d67e0ce
+// http://docs.opencv.org/3.4.0/d4/da8/group__imgcodecs.html#gabbc7ef1aa2edfaa87772f1202d67e0ce
 //
 func IMWriteWithParams(name string, img Mat, params []int) bool {
 	cName := C.CString(name)
@@ -173,7 +173,7 @@ func IMWriteWithParams(name string, img Mat, params []int) bool {
 // using the image format passed in in the form of a file extension string.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d4/da8/group__imgcodecs.html#ga461f9ac09887e47797a54567df3b8b63
+// http://docs.opencv.org/3.4.0/d4/da8/group__imgcodecs.html#ga461f9ac09887e47797a54567df3b8b63
 //
 func IMEncode(fileExt string, img Mat) (buf []byte, err error) {
 	cfileExt := C.CString(fileExt)
@@ -190,7 +190,7 @@ func IMEncode(fileExt string, img Mat) (buf []byte, err error) {
 // returns an empty matrix.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d4/da8/group__imgcodecs.html#ga26a67788faa58ade337f8d28ba0eb19e
+// https://docs.opencv.org/3.4.0/d4/da8/group__imgcodecs.html#ga26a67788faa58ade337f8d28ba0eb19e
 //
 func IMDecode(buf []byte, flags IMReadFlag) Mat {
 	data := toByteArray(buf)
diff --git a/imgproc.go b/imgproc.go
index 2973eab5..e7ace3c9 100644
--- a/imgproc.go
+++ b/imgproc.go
@@ -17,7 +17,7 @@ import (
 // code param containing the desired ColorConversionCode color space.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d7/d1b/group__imgproc__misc.html#ga4e0972be5de079fed4e3a10e24ef5ef0
+// http://docs.opencv.org/3.4.0/d7/d1b/group__imgproc__misc.html#ga4e0972be5de079fed4e3a10e24ef5ef0
 //
 func CvtColor(src Mat, dst Mat, code ColorConversionCode) {
 	C.CvtColor(src.p, dst.p, C.int(code))
@@ -30,7 +30,7 @@ func CvtColor(src Mat, dst Mat, code ColorConversionCode) {
 // fairly sharp. However, it is very slow compared to most filters.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d4/d86/group__imgproc__filter.html#ga9d7064d478c95d60003cf839430737ed
+// https://docs.opencv.org/3.4.0/d4/d86/group__imgproc__filter.html#ga9d7064d478c95d60003cf839430737ed
 //
 func BilateralFilter(src Mat, dst Mat, d int, sigmaColor float64, sigmaSpace float64) {
 	C.BilateralFilter(src.p, dst.p, C.int(d), C.double(sigmaColor), C.double(sigmaSpace))
@@ -41,7 +41,7 @@ func BilateralFilter(src Mat, dst Mat, d int, sigmaColor float64, sigmaSpace flo
 // the specified Gaussian kernel params.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d4/d86/group__imgproc__filter.html#gaabe8c836e97159a9193fb0b11ac52cf1
+// http://docs.opencv.org/3.4.0/d4/d86/group__imgproc__filter.html#gaabe8c836e97159a9193fb0b11ac52cf1
 //
 func Blur(src Mat, dst Mat, ksize image.Point) {
 	pSize := C.struct_Size{
@@ -55,7 +55,7 @@ func Blur(src Mat, dst Mat, ksize image.Point) {
 // Dilate dilates an image by using a specific structuring element.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d4/d86/group__imgproc__filter.html#ga4ff0f3318642c4f469d0e11f242f3b6c
+// https://docs.opencv.org/3.4.0/d4/d86/group__imgproc__filter.html#ga4ff0f3318642c4f469d0e11f242f3b6c
 //
 func Dilate(src Mat, dst Mat, kernel Mat) {
 	C.Dilate(src.p, dst.p, kernel.p)
@@ -64,7 +64,7 @@ func Dilate(src Mat, dst Mat, kernel Mat) {
 // Erode erodes an image by using a specific structuring element.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d4/d86/group__imgproc__filter.html#gaeb1e0c1033e3f6b891a25d0511362aeb
+// https://docs.opencv.org/3.4.0/d4/d86/group__imgproc__filter.html#gaeb1e0c1033e3f6b891a25d0511362aeb
 //
 func Erode(src Mat, dst Mat, kernel Mat) {
 	C.Erode(src.p, dst.p, kernel.p)
@@ -213,7 +213,7 @@ func FindContours(src Mat, mode RetrievalMode, method ContourApproximationMode)
 // or rasterized shape.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d3/dc0/group__imgproc__shape.html#ga556a180f43cab22649c23ada36a8a139
+// https://docs.opencv.org/3.4.0/d3/dc0/group__imgproc__shape.html#ga556a180f43cab22649c23ada36a8a139
 //
 func Moments(src Mat, binaryImage bool) map[string]float64 {
 	r := C.Moments(src.p, C.bool(binaryImage))
@@ -250,7 +250,7 @@ func Moments(src Mat, binaryImage bool) map[string]float64 {
 // MorphologyEx performs advanced morphological transformations.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d4/d86/group__imgproc__filter.html#ga67493776e3ad1a3df63883829375201f
+// https://docs.opencv.org/3.4.0/d4/d86/group__imgproc__filter.html#ga67493776e3ad1a3df63883829375201f
 //
 func MorphologyEx(src Mat, dst Mat, op MorphType, kernel Mat) {
 	C.MorphologyEx(src.p, dst.p, C.int(op), kernel.p)
@@ -274,7 +274,7 @@ const (
 // and shape for morphological operations.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d4/d86/group__imgproc__filter.html#gac342a1bb6eabf6f55c803b09268e36dc
+// https://docs.opencv.org/3.4.0/d4/d86/group__imgproc__filter.html#gac342a1bb6eabf6f55c803b09268e36dc
 //
 func GetStructuringElement(shape MorphShape, ksize image.Point) Mat {
 	sz := C.struct_Size{
@@ -345,7 +345,7 @@ const (
 // the specified Gaussian kernel params.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d4/d86/group__imgproc__filter.html#gaabe8c836e97159a9193fb0b11ac52cf1
+// http://docs.opencv.org/3.4.0/d4/d86/group__imgproc__filter.html#gaabe8c836e97159a9193fb0b11ac52cf1
 //
 func GaussianBlur(src Mat, dst Mat, ksize image.Point, sigmaX float64,
 	sigmaY float64, borderType BorderType) {
@@ -360,7 +360,7 @@ func GaussianBlur(src Mat, dst Mat, ksize image.Point, sigmaX float64,
 // Laplacian calculates the Laplacian of an image.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d4/d86/group__imgproc__filter.html#gad78703e4c8fe703d479c1860d76429e6
+// https://docs.opencv.org/3.4.0/d4/d86/group__imgproc__filter.html#gad78703e4c8fe703d479c1860d76429e6
 //
 func Laplacian(src Mat, dst Mat, dDepth int, kSize int, scale float64,
 	delta float64, borderType BorderType) {
@@ -370,7 +370,7 @@ func Laplacian(src Mat, dst Mat, dDepth int, kSize int, scale float64,
 // Scharr calculates the first x- or y- image derivative using Scharr operator.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d4/d86/group__imgproc__filter.html#gaa13106761eedf14798f37aa2d60404c9
+// https://docs.opencv.org/3.4.0/d4/d86/group__imgproc__filter.html#gaa13106761eedf14798f37aa2d60404c9
 //
 func Scharr(src Mat, dst Mat, dDepth int, dx int, dy int, scale float64,
 	delta float64, borderType BorderType) {
@@ -380,7 +380,7 @@ func Scharr(src Mat, dst Mat, dDepth int, dx int, dy int, scale float64,
 // MedianBlur blurs an image using the median filter.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d4/d86/group__imgproc__filter.html#ga564869aa33e58769b4469101aac458f9
+// https://docs.opencv.org/3.4.0/d4/d86/group__imgproc__filter.html#ga564869aa33e58769b4469101aac458f9
 //
 func MedianBlur(src Mat, dst Mat, ksize int) {
 	C.MedianBlur(src.p, dst.p, C.int(ksize))
@@ -395,7 +395,7 @@ func MedianBlur(src Mat, dst Mat, ksize int) {
 // See http://en.wikipedia.org/wiki/Canny_edge_detector
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/dd/d1a/group__imgproc__feature.html#ga04723e007ed888ddf11d9ba04e2232de
+// http://docs.opencv.org/3.4.0/dd/d1a/group__imgproc__feature.html#ga04723e007ed888ddf11d9ba04e2232de
 //
 func Canny(src Mat, edges Mat, t1 float32, t2 float32) {
 	C.Canny(src.p, edges.p, C.double(t1), C.double(t2))
@@ -405,7 +405,7 @@ func Canny(src Mat, edges Mat, t1 float32, t2 float32) {
 // the sub-pixel accurate location of corners or radial saddle points.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/dd/d1a/group__imgproc__feature.html#ga354e0d7c86d0d9da75de9b9701a9a87e
+// https://docs.opencv.org/3.4.0/dd/d1a/group__imgproc__feature.html#ga354e0d7c86d0d9da75de9b9701a9a87e
 //
 func CornerSubPix(img Mat, corners Mat, winSize image.Point, zeroZone image.Point, criteria TermCriteria) {
 	winSz := C.struct_Size{
@@ -426,7 +426,7 @@ func CornerSubPix(img Mat, corners Mat, winSize image.Point, zeroZone image.Poin
 // finds the most prominent corners in the image or in the specified image region.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/dd/d1a/group__imgproc__feature.html#ga1d6bb77486c8f92d79c8793ad995d541
+// https://docs.opencv.org/3.4.0/dd/d1a/group__imgproc__feature.html#ga1d6bb77486c8f92d79c8793ad995d541
 //
 func GoodFeaturesToTrack(img Mat, corners Mat, maxCorners int, quality float64, minDist float64) {
 	C.GoodFeaturesToTrack(img.p, corners.p, C.int(maxCorners), C.double(quality), C.double(minDist))
@@ -436,7 +436,7 @@ func GoodFeaturesToTrack(img Mat, corners Mat, maxCorners int, quality float64,
 // The only "method" currently supported is HOUGH_GRADIENT = 3.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/dd/d1a/group__imgproc__feature.html#ga47849c3be0d0406ad3ca45db65a25d2d
+// https://docs.opencv.org/3.4.0/dd/d1a/group__imgproc__feature.html#ga47849c3be0d0406ad3ca45db65a25d2d
 //
 func HoughCircles(src Mat, circles Mat, method int, dp float64, minDist float64) {
 	C.HoughCircles(src.p, circles.p, C.int(method), C.double(dp), C.double(minDist))
@@ -447,7 +447,7 @@ func HoughCircles(src Mat, circles Mat, method int, dp float64, minDist float64)
 // http://homepages.inf.ed.ac.uk/rbf/HIPR2/hough.htm
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/dd/d1a/group__imgproc__feature.html#ga46b4e588934f6c8dfd509cc6e0e4545a
+// http://docs.opencv.org/3.4.0/dd/d1a/group__imgproc__feature.html#ga46b4e588934f6c8dfd509cc6e0e4545a
 //
 func HoughLines(src Mat, lines Mat, rho float32, theta float32, threshold int) {
 	C.HoughLines(src.p, lines.p, C.double(rho), C.double(theta), C.int(threshold))
@@ -458,7 +458,7 @@ func HoughLines(src Mat, lines Mat, rho float32, theta float32, threshold int) {
 // http://homepages.inf.ed.ac.uk/rbf/HIPR2/hough.htm
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/dd/d1a/group__imgproc__feature.html#ga8618180a5948286384e3b7ca02f6feeb
+// http://docs.opencv.org/3.4.0/dd/d1a/group__imgproc__feature.html#ga8618180a5948286384e3b7ca02f6feeb
 //
 func HoughLinesP(src Mat, lines Mat, rho float32, theta float32, threshold int) {
 	C.HoughLinesP(src.p, lines.p, C.double(rho), C.double(theta), C.int(threshold))
@@ -506,7 +506,7 @@ func Threshold(src Mat, dst Mat, thresh float32, maxvalue float32, typ Threshold
 // to the second one.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d6/d6e/group__imgproc__draw.html#ga0a165a3ca093fd488ac709fdf10c05b2
+// https://docs.opencv.org/3.4.0/d6/d6e/group__imgproc__draw.html#ga0a165a3ca093fd488ac709fdf10c05b2
 //
 func ArrowedLine(img Mat, pt1 image.Point, pt2 image.Point, c color.RGBA, thickness int) {
 	sp1 := C.struct_Point{
@@ -532,7 +532,7 @@ func ArrowedLine(img Mat, pt1 image.Point, pt2 image.Point, c color.RGBA, thickn
 // Circle draws a circle.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d6/d6e/group__imgproc__draw.html#gaf10604b069374903dbd0f0488cb43670
+// https://docs.opencv.org/3.4.0/d6/d6e/group__imgproc__draw.html#gaf10604b069374903dbd0f0488cb43670
 //
 func Circle(img Mat, center image.Point, radius int, c color.RGBA, thickness int) {
 	pc := C.struct_Point{
@@ -553,7 +553,7 @@ func Circle(img Mat, center image.Point, radius int, c color.RGBA, thickness int
 // Line draws a line segment connecting two points.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2
+// https://docs.opencv.org/3.4.0/d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2
 //
 func Line(img Mat, pt1 image.Point, pt2 image.Point, c color.RGBA, thickness int) {
 	sp1 := C.struct_Point{
@@ -580,7 +580,7 @@ func Line(img Mat, pt1 image.Point, pt2 image.Point, c color.RGBA, thickness int
 // It renders a rectangle with the desired characteristics to the target Mat image.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d6/d6e/group__imgproc__draw.html#ga346ac30b5c74e9b5137576c9ee9e0e8c
+// http://docs.opencv.org/3.4.0/d6/d6e/group__imgproc__draw.html#ga346ac30b5c74e9b5137576c9ee9e0e8c
 //
 func Rectangle(img Mat, r image.Rectangle, c color.RGBA, thickness int) {
 	cRect := C.struct_Rect{
@@ -636,7 +636,7 @@ const (
 // a specific font face, scale, and thickness.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d6/d6e/group__imgproc__draw.html#ga3d2abfcb995fd2db908c8288199dba82
+// http://docs.opencv.org/3.4.0/d6/d6e/group__imgproc__draw.html#ga3d2abfcb995fd2db908c8288199dba82
 //
 func GetTextSize(text string, fontFace HersheyFont, fontScale float64, thickness int) image.Point {
 	cText := C.CString(text)
@@ -652,7 +652,7 @@ func GetTextSize(text string, fontFace HersheyFont, fontScale float64, thickness
 // color, and line thinkness.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d6/d6e/group__imgproc__draw.html#ga5126f47f883d730f633d74f07456c576
+// http://docs.opencv.org/3.4.0/d6/d6e/group__imgproc__draw.html#ga5126f47f883d730f633d74f07456c576
 //
 func PutText(img Mat, text string, org image.Point, fontFace HersheyFont, fontScale float64, c color.RGBA, thickness int) {
 	cText := C.CString(text)
@@ -710,7 +710,7 @@ const (
 // zero for both fx and fy.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/da/d54/group__imgproc__transform.html#ga47a974309e9102f5f08231edc7e7529d
+// https://docs.opencv.org/3.4.0/da/d54/group__imgproc__transform.html#ga47a974309e9102f5f08231edc7e7529d
 func Resize(src, dst Mat, sz image.Point, fx, fy float64, interp InterpolationFlags) {
 	pSize := C.struct_Size{
 		width:  C.int(sz.X),
@@ -724,7 +724,7 @@ func Resize(src, dst Mat, sz image.Point, fx, fy float64, interp InterpolationFl
 // GetRotationMatrix2D calculates an affine matrix of 2D rotation.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/da/d54/group__imgproc__transform.html#gafbbc470ce83812914a70abfb604f4326
+// https://docs.opencv.org/3.4.0/da/d54/group__imgproc__transform.html#gafbbc470ce83812914a70abfb604f4326
 func GetRotationMatrix2D(center image.Point, angle, scale float64) Mat {
 	pc := C.struct_Point{
 		x: C.int(center.X),
@@ -736,7 +736,7 @@ func GetRotationMatrix2D(center image.Point, angle, scale float64) Mat {
 // WarpAffine applies an affine transformation to an image. For more parameters please check WarpAffineWithParams
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/da/d54/group__imgproc__transform.html#ga0203d9ee5fcd28d40dbc4a1ea4451983
+// https://docs.opencv.org/3.4.0/da/d54/group__imgproc__transform.html#ga0203d9ee5fcd28d40dbc4a1ea4451983
 func WarpAffine(src, dst, m Mat, sz image.Point) {
 	pSize := C.struct_Size{
 		width:  C.int(sz.X),
@@ -749,7 +749,7 @@ func WarpAffine(src, dst, m Mat, sz image.Point) {
 // WarpAffineWithParams applies an affine transformation to an image.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/da/d54/group__imgproc__transform.html#ga0203d9ee5fcd28d40dbc4a1ea4451983
+// https://docs.opencv.org/3.4.0/da/d54/group__imgproc__transform.html#ga0203d9ee5fcd28d40dbc4a1ea4451983
 func WarpAffineWithParams(src, dst, m Mat, sz image.Point, flags InterpolationFlags, borderType BorderType, borderValue color.RGBA) {
 	pSize := C.struct_Size{
 		width:  C.int(sz.X),
@@ -767,13 +767,13 @@ func WarpAffineWithParams(src, dst, m Mat, sz image.Point, flags InterpolationFl
 // ColormapTypes are the 12 GNU Octave/MATLAB equivalent colormaps.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d3/d50/group__imgproc__colormap.html
+// https://docs.opencv.org/3.4.0/d3/d50/group__imgproc__colormap.html
 type ColormapTypes int
 
 // List of the available color maps
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d3/d50/group__imgproc__colormap.html#ga9a805d8262bcbe273f16be9ea2055a65
+// https://docs.opencv.org/3.4.0/d3/d50/group__imgproc__colormap.html#ga9a805d8262bcbe273f16be9ea2055a65
 const (
 	ColormapAutumn  ColormapTypes = 0
 	ColormapBone                  = 1
@@ -793,7 +793,7 @@ const (
 // ApplyColorMap applies a GNU Octave/MATLAB equivalent colormap on a given image.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d3/d50/group__imgproc__colormap.html#gadf478a5e5ff49d8aa24e726ea6f65d15
+// https://docs.opencv.org/3.4.0/d3/d50/group__imgproc__colormap.html#gadf478a5e5ff49d8aa24e726ea6f65d15
 func ApplyColorMap(src, dst Mat, colormapType ColormapTypes) {
 	C.ApplyColorMap(src.p, dst.p, C.int(colormapType))
 }
@@ -801,7 +801,7 @@ func ApplyColorMap(src, dst Mat, colormapType ColormapTypes) {
 // ApplyCustomColorMap applies a custom defined colormap on a given image.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d3/d50/group__imgproc__colormap.html#gacb22288ddccc55f9bd9e6d492b409cae
+// https://docs.opencv.org/3.4.0/d3/d50/group__imgproc__colormap.html#gacb22288ddccc55f9bd9e6d492b409cae
 func ApplyCustomColorMap(src, dst, customColormap Mat) {
 	C.ApplyCustomColorMap(src.p, dst.p, customColormap.p)
 }
diff --git a/imgproc_colorcodes.go b/imgproc_colorcodes.go
index f1458450..3ad2352a 100644
--- a/imgproc_colorcodes.go
+++ b/imgproc_colorcodes.go
@@ -3,7 +3,7 @@ package gocv
 // ColorConversionCode is a color conversion code used on Mat.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d7/d1b/group__imgproc__misc.html#ga4e0972be5de079fed4e3a10e24ef5ef0
+// http://docs.opencv.org/3.4.0/d7/d1b/group__imgproc__misc.html#ga4e0972be5de079fed4e3a10e24ef5ef0
 //
 type ColorConversionCode int
 
diff --git a/objdetect.go b/objdetect.go
index c90c978d..f03cb4d1 100644
--- a/objdetect.go
+++ b/objdetect.go
@@ -14,7 +14,7 @@ import (
 // CascadeClassifier is a cascade classifier class for object detection.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d1/de5/classcv_1_1CascadeClassifier.html
+// http://docs.opencv.org/3.4.0/d1/de5/classcv_1_1CascadeClassifier.html
 //
 type CascadeClassifier struct {
 	p C.CascadeClassifier
@@ -35,7 +35,7 @@ func (c *CascadeClassifier) Close() error {
 // Load cascade classifier from a file.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d1/de5/classcv_1_1CascadeClassifier.html#a1a5884c8cc749422f9eb77c2471958bc
+// http://docs.opencv.org/3.4.0/d1/de5/classcv_1_1CascadeClassifier.html#a1a5884c8cc749422f9eb77c2471958bc
 //
 func (c *CascadeClassifier) Load(name string) bool {
 	cName := C.CString(name)
@@ -47,7 +47,7 @@ func (c *CascadeClassifier) Load(name string) bool {
 // The detected objects are returned as a slice of image.Rectangle structs.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d1/de5/classcv_1_1CascadeClassifier.html#aaf8181cb63968136476ec4204ffca498
+// http://docs.opencv.org/3.4.0/d1/de5/classcv_1_1CascadeClassifier.html#aaf8181cb63968136476ec4204ffca498
 //
 func (c *CascadeClassifier) DetectMultiScale(img Mat) []image.Rectangle {
 	ret := C.CascadeClassifier_DetectMultiScale(c.p, img.p)
@@ -73,7 +73,7 @@ func (c *CascadeClassifier) DetectMultiScale(img Mat) []image.Rectangle {
 // to values other than just the defaults.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d1/de5/classcv_1_1CascadeClassifier.html#aaf8181cb63968136476ec4204ffca498
+// http://docs.opencv.org/3.4.0/d1/de5/classcv_1_1CascadeClassifier.html#aaf8181cb63968136476ec4204ffca498
 //
 func (c *CascadeClassifier) DetectMultiScaleWithParams(img Mat, scale float64,
 	minNeighbors, flags int, minSize, maxSize image.Point) []image.Rectangle {
@@ -111,7 +111,7 @@ func (c *CascadeClassifier) DetectMultiScaleWithParams(img Mat, scale float64,
 // HOGDescriptor is a Histogram Of Gradiants (HOG) for object detection.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d5/d33/structcv_1_1HOGDescriptor.html#a723b95b709cfd3f95cf9e616de988fc8
+// https://docs.opencv.org/3.4.0/d5/d33/structcv_1_1HOGDescriptor.html#a723b95b709cfd3f95cf9e616de988fc8
 //
 type HOGDescriptor struct {
 	p C.HOGDescriptor
@@ -133,7 +133,7 @@ func (h *HOGDescriptor) Close() error {
 // The detected objects are returned as a slice of image.Rectangle structs.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d5/d33/structcv_1_1HOGDescriptor.html#a660e5cd036fd5ddf0f5767b352acd948
+// https://docs.opencv.org/3.4.0/d5/d33/structcv_1_1HOGDescriptor.html#a660e5cd036fd5ddf0f5767b352acd948
 //
 func (h *HOGDescriptor) DetectMultiScale(img Mat) []image.Rectangle {
 	ret := C.HOGDescriptor_DetectMultiScale(h.p, img.p)
@@ -159,7 +159,7 @@ func (h *HOGDescriptor) DetectMultiScale(img Mat) []image.Rectangle {
 // to values other than just the defaults.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d5/d33/structcv_1_1HOGDescriptor.html#a660e5cd036fd5ddf0f5767b352acd948
+// https://docs.opencv.org/3.4.0/d5/d33/structcv_1_1HOGDescriptor.html#a660e5cd036fd5ddf0f5767b352acd948
 //
 func (h *HOGDescriptor) DetectMultiScaleWithParams(img Mat, hitThresh float64,
 	winStride, padding image.Point, scale, finalThreshold float64, useMeanshiftGrouping bool) []image.Rectangle {
@@ -196,7 +196,7 @@ func (h *HOGDescriptor) DetectMultiScaleWithParams(img Mat, hitThresh float64,
 // HOGDefaultPeopleDetector returns a new Mat with the HOG DefaultPeopleDetector.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d5/d33/structcv_1_1HOGDescriptor.html#a660e5cd036fd5ddf0f5767b352acd948
+// https://docs.opencv.org/3.4.0/d5/d33/structcv_1_1HOGDescriptor.html#a660e5cd036fd5ddf0f5767b352acd948
 //
 func HOGDefaultPeopleDetector() Mat {
 	return Mat{p: C.HOG_GetDefaultPeopleDetector()}
@@ -205,7 +205,7 @@ func HOGDefaultPeopleDetector() Mat {
 // SetSVMDetector sets the data for the HOGDescriptor.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d5/d33/structcv_1_1HOGDescriptor.html#a09e354ad701f56f9c550dc0385dc36f1
+// https://docs.opencv.org/3.4.0/d5/d33/structcv_1_1HOGDescriptor.html#a09e354ad701f56f9c550dc0385dc36f1
 //
 func (h *HOGDescriptor) SetSVMDetector(det Mat) error {
 	C.HOGDescriptor_SetSVMDetector(h.p, det.p)
@@ -215,7 +215,7 @@ func (h *HOGDescriptor) SetSVMDetector(det Mat) error {
 // GroupRectangles groups the object candidate rectangles.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d5/d54/group__objdetect.html#ga3dba897ade8aa8227edda66508e16ab9
+// https://docs.opencv.org/3.4.0/d5/d54/group__objdetect.html#ga3dba897ade8aa8227edda66508e16ab9
 //
 func GroupRectangles(rects []image.Rectangle, groupThreshold int, eps float64) []image.Rectangle {
 	cRectArray := make([]C.struct_Rect, len(rects))
diff --git a/video.go b/video.go
index f4c7a947..3e15cb74 100644
--- a/video.go
+++ b/video.go
@@ -18,7 +18,7 @@ type BackgroundSubtractorMOG2 struct {
 // Segmentation Algorithm.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/d7b/classcv_1_1BackgroundSubtractorMOG2.html
+// https://docs.opencv.org/3.4.0/d7/d7b/classcv_1_1BackgroundSubtractorMOG2.html
 //
 func NewBackgroundSubtractorMOG2() BackgroundSubtractorMOG2 {
 	return BackgroundSubtractorMOG2{p: unsafe.Pointer(C.BackgroundSubtractorMOG2_Create())}
@@ -34,7 +34,7 @@ func (b *BackgroundSubtractorMOG2) Close() error {
 // Apply computes a foreground mask using the current BackgroundSubtractorMOG2.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/df6/classcv_1_1BackgroundSubtractor.html#aa735e76f7069b3fa9c3f32395f9ccd21
+// https://docs.opencv.org/3.4.0/d7/df6/classcv_1_1BackgroundSubtractor.html#aa735e76f7069b3fa9c3f32395f9ccd21
 //
 func (b *BackgroundSubtractorMOG2) Apply(src Mat, dst Mat) {
 	C.BackgroundSubtractorMOG2_Apply((C.BackgroundSubtractorMOG2)(b.p), src.p, dst.p)
@@ -52,7 +52,7 @@ type BackgroundSubtractorKNN struct {
 // Segmentation Algorithm
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/db/d88/classcv_1_1BackgroundSubtractorKNN.html
+// https://docs.opencv.org/3.4.0/db/d88/classcv_1_1BackgroundSubtractorKNN.html
 //
 func NewBackgroundSubtractorKNN() BackgroundSubtractorKNN {
 	return BackgroundSubtractorKNN{p: unsafe.Pointer(C.BackgroundSubtractorKNN_Create())}
@@ -68,7 +68,7 @@ func (k *BackgroundSubtractorKNN) Close() error {
 // Apply computes a foreground mask using the current BackgroundSubtractorKNN.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/d7/df6/classcv_1_1BackgroundSubtractor.html#aa735e76f7069b3fa9c3f32395f9ccd21
+// https://docs.opencv.org/3.4.0/d7/df6/classcv_1_1BackgroundSubtractor.html#aa735e76f7069b3fa9c3f32395f9ccd21
 //
 func (k *BackgroundSubtractorKNN) Apply(src Mat, dst Mat) {
 	C.BackgroundSubtractorKNN_Apply((C.BackgroundSubtractorKNN)(k.p), src.p, dst.p)
@@ -79,7 +79,7 @@ func (k *BackgroundSubtractorKNN) Apply(src Mat, dst Mat) {
 // Gunnar Farneback's algorithm.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/dc/d6b/group__video__track.html#ga5d10ebbd59fe09c5f650289ec0ece5af
+// https://docs.opencv.org/3.4.0/dc/d6b/group__video__track.html#ga5d10ebbd59fe09c5f650289ec0ece5af
 //
 func CalcOpticalFlowFarneback(prevImg Mat, nextImg Mat, flow Mat, pyrScale float64, levels int, winsize int,
 	iterations int, polyN int, polySigma float64, flags int) {
@@ -92,7 +92,7 @@ func CalcOpticalFlowFarneback(prevImg Mat, nextImg Mat, flow Mat, pyrScale float
 // the iterative Lucas-Kanade method with pyramids.
 //
 // For further details, please see:
-// https://docs.opencv.org/3.3.1/dc/d6b/group__video__track.html#ga473e4b886d0bcc6b65831eb88ed93323
+// https://docs.opencv.org/3.4.0/dc/d6b/group__video__track.html#ga473e4b886d0bcc6b65831eb88ed93323
 //
 func CalcOpticalFlowPyrLK(prevImg Mat, nextImg Mat, prevPts Mat, nextPts Mat, status Mat, err Mat) {
 	C.CalcOpticalFlowPyrLK(prevImg.p, nextImg.p, prevPts.p, nextPts.p, status.p, err.p)
diff --git a/videoio.go b/videoio.go
index fdb06386..de9b4978 100644
--- a/videoio.go
+++ b/videoio.go
@@ -152,7 +152,7 @@ const (
 // VideoCapture is a wrapper around the OpenCV VideoCapture class.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/d8/dfe/classcv_1_1VideoCapture.html
+// http://docs.opencv.org/3.4.0/d8/dfe/classcv_1_1VideoCapture.html
 //
 type VideoCapture struct {
 	p C.VideoCapture
@@ -216,7 +216,7 @@ func (v *VideoCapture) Grab(skip int) {
 // VideoWriter is a wrapper around the OpenCV VideoWriter`class.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/dd/d9e/classcv_1_1VideoWriter.html
+// http://docs.opencv.org/3.4.0/dd/d9e/classcv_1_1VideoWriter.html
 //
 type VideoWriter struct {
 	mu *sync.RWMutex
@@ -228,7 +228,7 @@ type VideoWriter struct {
 // codec, for example "MJPG".
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/dd/d9e/classcv_1_1VideoWriter.html#a0901c353cd5ea05bba455317dab81130
+// http://docs.opencv.org/3.4.0/dd/d9e/classcv_1_1VideoWriter.html#a0901c353cd5ea05bba455317dab81130
 //
 func VideoWriterFile(name string, codec string, fps float64, width int, height int) (vw *VideoWriter, err error) {
 	vw = &VideoWriter{
@@ -256,7 +256,7 @@ func (vw *VideoWriter) Close() error {
 // IsOpened checks if the VideoWriter is open and ready to be written to.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/dd/d9e/classcv_1_1VideoWriter.html#a9a40803e5f671968ac9efa877c984d75
+// http://docs.opencv.org/3.4.0/dd/d9e/classcv_1_1VideoWriter.html#a9a40803e5f671968ac9efa877c984d75
 //
 func (vw *VideoWriter) IsOpened() bool {
 	isOpend := C.VideoWriter_IsOpened(vw.p)
@@ -266,7 +266,7 @@ func (vw *VideoWriter) IsOpened() bool {
 // Write the next video frame from the Mat image to the open VideoWriter.
 //
 // For further details, please see:
-// http://docs.opencv.org/3.3.1/dd/d9e/classcv_1_1VideoWriter.html#a3115b679d612a6a0b5864a0c88ed4b39
+// http://docs.opencv.org/3.4.0/dd/d9e/classcv_1_1VideoWriter.html#a3115b679d612a6a0b5864a0c88ed4b39
 //
 func (vw *VideoWriter) Write(img Mat) error {
 	vw.mu.Lock()