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.
Begg took three maternity leaves of around six months in the space of five years, returning to work each time in a four-day week capacity.
append uses a small, stack-allocated backing store as the first，更多细节参见夫子
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