Get coordinates of the face

[sonidiaz]

Hi, guys, me again
In the app that I am working I need to get a picture of the face for each gesture that the user makes. For that I need to get the data of the x, y, width and height coordinates like jeelizFaceFilter does with detectState.
I saw that they added the method get_positionScale() (#5) but I can not get the data correctly and I do not know if it will help me for what I need. Could you tell me if that is the way to go to get that data (x, y, w, h) with JEEFACETRANSFERAPI?

Thank you!

[xavierjs]

With positionScale you got Px,Py,s relative to the viewport
To get x,y,w,h in pixels you have:
x = W*(Px+1)/2
y = H*(Py+1)/2
w = W*s
h = w (because the face detection is a square)
W,H are the size of the viewport in pixels.
x,y are the coordinates of the center of the detection window (not the corner).

[sonidiaz]

Thanks for the quick reply!
I will review that function.

[sonidiaz]

Hi @xavierjs,

Sorry to bother you, but I can't get the data correctly, I'm probably doing something wrong, but with the data I get I can't do much. Do you have an example of how to apply it?

Thanks and sorry again!

[xavierjs]

Hi,

I did a mistake, I correct it and commit the changes, it should be working now :)
I also updated the documentation. x and y are given between 0 and 1
Only 3 floats are returned by get_positionScale. Indeed since the detection window is a square we don't need the scale along the vertical axis.
It also allows me to detect and correct a bug relative to stabilization :).

[xavierjs]

To resume,
To get x,y,w,h in pixels you have:
x = WPx
y = HPy
w = W*s
h = w (because the face detection is a square)
W,H are the size of the viewport in pixels.
x,y are the coordinates of the center of the detection window (not the corner).

[sonidiaz]

Hi, @xavierjs
Yea!!! Now it works very well and the stabilization has improved a lot.
Thank you!