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تبدیل خطی هاف
Eyelids were isolated by first fitting a line to the upper and lower eyelid using the linear Hough transform.
The linear Hough transform is implemented using the MATLAB(r) Radon transform, which is a form of the Hough transform.
A linear Hough transform has the advantage over its parabolic version, in that there are less parameters to deduce, making the process less computationally demanding.
Automatic segmentation was achieved through the use of the circular Hough transform for localising the iris and pupil regions, and the linear Hough transform for localising occluding eyelids.
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