To exaggerate color features on a face, we can always get the features first by subtracting the warpped face from the main face, and then add or subtract the difference times a scale (alpha) back to the main face.
My face warped to the mean shape
Mean face
Difference
alpha=-1: mean - difference
alpha=2: mean + 2* difference
It seems not work not on the gray images. Now I will try to exaggerate shape features instead.
To exaggerate shape features on a face, I times a scale (alpha) to difference between the reference points on my face and the mean face. Then I add the result back to mean face reference point cooridinates to enlarge my difference from the mean face.
Below are examples setting alpha = 1.5 and 3 respectively, and we can see my features like
large nose, smiled mouth and narrower jaw are exaggerated!
my face warpped to the mean shape
(alpha = 1)
my original face
alpha = 3
alpha = 1.5
mean face
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