Detect eye blink?

[zhu2bowen]

Are the ret landmarks suitable to compute EAR？
more see https://pyimagesearch.com/2017/04/24/eye-blink-detection-opencv-python-dlib/
def eye_aspect_ratio(eye):
# compute the euclidean distances between the two sets of
# vertical eye landmarks (x, y)-coordinates
A = dist.euclidean(eye[1], eye[5])
B = dist.euclidean(eye[2], eye[4])

# compute the euclidean distance between the horizontal
# eye landmark (x, y)-coordinates
C = dist.euclidean(eye[0], eye[3])

# compute the eye aspect ratio
ear = (A + B) / (2.0 * C)

# return the eye aspect ratio
return ear