Question

I have been working on a college project using OpenCV. I made a simple program which detects faces, by passing frames captured by a webcam in a function which detects faces.

On detection it draws black boxes on the faces when detected. However my project does not end here, i would like to be able to clip out those faces which get detected as soon as possible and save it in an image and then apply different image processing techniques [as per my need]. If this is too problematic i could use a simple image instead of using frames captured by a webcam.

I am just clueless about how to go about clipping those faces out that get detected.

Answer 1

For C++ version you can check this tutorial from OpenCV documentation.

In the function detectAndDisplay you can see the line

Mat faceROI = frame_gray( faces[i] );

where faceROI is clipped face and you can save it to file with imwrite function:

imwrite("face.jpg", faceROI);