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 :
二是“猛火炒饭”。曾经推着三轮车流动出摊的店主没有想到，自己的炒饭大受远近食客欢迎。他更没想到的是，为了留住街头这股“烟火气”，在属地街道和城管执法部门共同协调下，他拥有了一家属于自己的小店。几乎每天下午4点刚过，就有不少人在门口排队，只为等待那一口锅气。
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Which Samsung Galaxy Phone Should You Buy?。同城约会是该领域的重要参考
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It isn’t just celebrities like George Clooney packing up for France. Places like Portugal, Spain, and the Netherlands have seen American expat populations double lately, and Germany and Ireland both received more American arrivals last year than the other way around.