Face recognition and image normalization
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How can I normalize image to align the eyes with a horizontal line.
EyeDetect = vision.CascadeObjectDetector('EyePairBig');
I = imread('1.jpg');
As I understand I can rotate image by imrotate , but I need to know angle of the rotation.
Dima Lisin on 6 Nov 2014
If (x1,y1) is the center of the first eye, and (x2, y2) is the center of the second eye, then (y2 - y1) / (x2 - x1) is the tangent of the angle between the line connecting the two centers and the horizontal. You can get the angle using atan2(y2-y1, x2-x1).