Mastering OpenCV 4 - Third Edition

Implementation of the skin color changer

Rather than detecting the skin color and then the region with that skin color, we can use OpenCV's floodFill() function, which is similar to the bucket fill tool in most image editing software. We know that the regions in the middle of the screen should be skin pixels (since we asked the user to put their face in the middle), so to change the whole face to have green skin, we can just apply a green flood fill on the center pixel, which will always color some parts of the face green. In reality, the color, saturation, and brightness are likely to be different in different parts of the face, so a flood fill will rarely cover all the skin pixels of a face unless the threshold is so low that it also covers ...