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When you receive the eye region from haarcascade you can localize the pupil in the eye region. If your input image resolution is low The robust method for localize the pupil use of k-mean(k=3) for segmentation then use circle hough for localization of pupil.If you don't segment your input image then circle hough is unstable.

When you receive the eye region from haarcascade you can localize the pupil in the eye region. If your input image resolution is low The robust method for localize pupil localization is the pupil use of k-mean(k=3) for segmentation then use circle hough for localization of pupil.If pupil. If you don't segment your input image then circle hough is unstable.