Differential square image plane and the image can reflect the energy of high frequency. Computational method of Planar Differential squares calculated in the space domain to the square of the difference between the brightness of adjacent pixels and corresponds to the image in the frequency domain calculation of high frequency energy and, this value is larger, the more accurate the image focus

spsmd算法\HSIKJ.m
.........\HSITEST.m
.........\rgb2hsi.m
spsmd算法

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