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Фото: Valentyn Ogirenko / Reuters
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Another way to approach dithering is to analyse the input image in order to make informed decisions about how best to perturb pixel values prior to quantisation. Error-diffusion dithering does this by sequentially taking the quantisation error for the current pixel (the difference between the input value and the quantised value) and distributing it to surrounding pixels in variable proportions according to a diffusion kernel . The result is that input pixel values are perturbed just enough to compensate for the error introduced by previous pixels.
街头肯定不太平。国会肯定吵翻天。不管什么党，不管什么旗帜，老百姓对掏钱这件事是最敏感的。这场战争很可能还没打起来，政治上就先崩了。