Generating an "alien" mode using skin detection
Now that we have a sketch mode, a cartoon mode (painting + sketch mask), and an evil mode (painting + evil mask), for fun let's try something more complex: an "alien" mode, by detecting the skin regions of the face and then changing the skin color to be green.
Skin-detection algorithm
There are many different techniques used for detecting skin regions, from simple color thresholds using RGB (Red-Green-Blue) or HSV (Hue-Saturation-Brightness) values or color histogram calculation and reprojection, to complex machine-learning algorithms of mixture models that need camera calibration in the CIELab color space and offline training with many sample faces, and so on. But even the complex methods don't ...
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