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 :
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
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Марина Аверкина
With only a handful of clues to answer, the daily puzzle doubles as a speed-running test for many who play it.