| 摘要 |
A system and method of modifying pixels supplied to the system that a multiple level signals for a digitized image wherein a moving pixel window with a center pixel, Dc, is used from which the annular means, ma, of the center pixel (the mean of the 2N pixel values of the window surrounding the center pixel, where N is an integer of 1 or more) is determined with the center pixel and selected pixels surrounding the center pixel, Dc, are used to determine a measure of deviation (center deviation, .sigma.c) of the center pixel relative to the center pixel that is used to obtain a modification gain, f(.sigma.c,Cg). The center pixel, Dc, its annular mean, ma, and its modification gain, f(.sigma.c,Cg) or f'(.sigma.c,Cg) are used to obtain a modified center pixel value, Dc', in accordance with one of the following equations that are of the form for an algorithm for determining the unsharp masking filter value for an image pixel: Dc' = ¢f(.sigma.c,Cg) x (Dc - ma)! + ma; or where n is an integer of 0 or greater. |
