Spherical Shading Correction of Eye Fundus Image by Parabola Function
The hill climbing method; all the results obtained don’t converge into the true values, but they depend rather on the initial values.
The pattern search method; this is a simplification of the hill climbing method. The results obtained do not always converge into the true values.
The razor search method; to improve the convergence of the pattern search method, we apply the razor search method additionally to the pattern search method.
The slice method; when we binarize a spherical shaded image of eye fundus photograph by thresolding, a circular area is obtained. We can estimate the shading correcting function from this area. By this algorithm, we obtained the good corrected images that depict the blood vessels.
KeywordsPattern Search Circular Area Parabola Function Ocular Fundus Slice Method
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