codeScanner.cpp

#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <zbar.h>
#include <iostream>

using namespace cv;
using namespace std;
using namespace zbar;

 //g++ main.cpp /usr/local/include/ /usr/local/lib/ -lopencv_highgui.2.4.8 -lopencv_core.2.4.8  
int main(int argc, char* argv[])  
{
    VideoCapture cap(0); // open the video camera no. 0  
    // cap.set(CV_CAP_PROP_FRAME_WIDTH,800);  
    // cap.set(CV_CAP_PROP_FRAME_HEIGHT,640);  
    if (!cap.isOpened()) // if not success, exit program  
    {
        cout << "Cannot open the video cam" << endl;  
        return -1;  
    }  
    ImageScanner scanner;   
    scanner.set_config(ZBAR_NONE, ZBAR_CFG_ENABLE, 1);   
    double dWidth = cap.get(CV_CAP_PROP_FRAME_WIDTH); //get the width of frames of the video  
    double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //get the height of frames of the video  
    cout << "Frame size : " << dWidth << " x " << dHeight << endl;  
    namedWindow("MyVideo",CV_WINDOW_AUTOSIZE); //create a window called "MyVideo"  

    while (1)
    {
        Mat frame;
        bool bSuccess = cap.read(frame); // read a new frame from video  
        if (!bSuccess) //if not success, break loop  
        {
            cout << "Cannot read a frame from video stream" << endl;  
            break;  
        }

        Mat grey;  
        cvtColor(frame,grey,CV_BGR2GRAY);  
        int width = frame.cols;   
        int height = frame.rows;   
        uchar *raw = (uchar *)grey.data;   
        // wrap image data   
        Image image(width, height, "Y800", raw, width * height);   
        // scan the image for barcodes   
        int n = scanner.scan(image);   
        // extract results   
        for(Image::SymbolIterator symbol = image.symbol_begin(); symbol != image.symbol_end(); ++symbol)
        { 
            vector<Point> vp;   
            // do something useful with results   
            cout << "decoded " << symbol->get_type_name() << " symbol " << symbol->get_data() << '"' << " " << endl;   
            int n = symbol->get_location_size();   
            for(int i=0; i<n; ++i)
            { 
                vp.push_back(Point(symbol->get_location_x(i),symbol->get_location_y(i)));   
            }

            RotatedRect r = minAreaRect(vp);
            Point2f pts[4];   
            r.points(pts);   
            for(int i=0;i<4;i++)
            { 
                line(frame,pts[i],pts[(i+1)%4],Scalar(255,0,0),3);   
            }   
            //cout<<"Angle: "<<r.angle<<endl;   
            }   
            imshow("MyVideo", frame); //show the frame in "MyVideo" window  
            if (waitKey(30) == 27) //wait for 'esc' key press for 30ms. If 'esc' key is pressed, break loop  
            {
                cout << "esc key is pressed by user" << endl;  
            break;
        }
    }
    return 0;
}