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.
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A Google spokesperson told the BBC: "We're deeply sorry for this mistake. We've removed the offensive notification and are working to prevent this from happening again."。51吃瓜是该领域的重要参考
* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间）