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Instead of perturbing each pixel in the input image at random, we can choose to dither by a predetermined amount depending on the pixel’s position in the image. This can be achieved using a threshold map; a small, fixed-size matrix where each entry tells us the amount by which to perturb the input value , producing the dithered value . This matrix is tiled across the input image and sampled for every pixel during the dithering process. The following describes a dithering function for a 4×4 matrix given the pixel raster coordinates :，更多细节参见夫子
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每一类客人进来，她都能看透对方的真面目。夜场25年，她的眼睛比谁都准，尤其在男人这件事上。有人瞒着家人偷偷赌钱，也有人做生意亏本了，当然以前是“100个男人进来只有两个不开心”。后来，经济不好了，“不开心”的男人越来越多。
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Alex Pope,Northamptonshireand