fix 5-landmark dlib eye points #249

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goigle wants to merge 1 commit into PyImageSearch:master

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fix 5-landmark dlib eye points #249

goigle wants to merge 1 commit into PyImageSearch:master from goigle:master

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@goigle goigle commented Jun 1, 2021 •

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Currently, the points for the 5 landmark dlib model are wrong. The range uses 1 point for each eye, when it should be two points. The range for dlib 68 for the eyes are 36-42 (6 pts) and 42-48 (6pts). For dlib 5, it's 0-1 (1pt) and 2-3 (1pt) respectively. Changing the range to 0-2 and 2-4 correctly gives 2 pts for each eye and allows properly calculating the centerpoint of the eye.

This fix makes the face aligner work identically for both dlib models, like intended:

 			if (len(shape)==68):
 			# extract the left and right eye (x, y)-coordinates
 			(lStart, lEnd) = FACIAL_LANDMARKS_68_IDXS["left_eye"]
 			(rStart, rEnd) = FACIAL_LANDMARKS_68_IDXS["right_eye"]
 		else:
 			(lStart, lEnd) = FACIAL_LANDMARKS_5_IDXS["left_eye"]
 			(rStart, rEnd) = FACIAL_LANDMARKS_5_IDXS["right_eye"]
 		leftEyePts = shape[lStart:lEnd]
 		rightEyePts = shape[rStart:rEnd]

Here's a chart showing the proper indexes for dlib's 5 and 68 face landmark models