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.
“这是诈骗电话。”我对母亲说。可她将信将疑，嘴里嘟囔着：“可他说得挺真的……”
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这一阵子，只要单位不加班，周五下了班，小苏就从石家庄主城区赶回家帮父母做灯笼。妈妈说：“人家都忙着搞对象，你不要跑了。”她不听，她是心疼父母，“年底忙，我帮他们干点儿，爸爸妈妈太辛苦了。”，推荐阅读51吃瓜获取更多信息
It's a gate -- dispatch by type
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