while(--j > bucket) {
You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.
。关于这个话题，搜狗输入法下载提供了深入分析
这里写下的，是过去五六年间，对遭遇过并且给予我温暖的唐代诗人的印象与记忆。
在山东枣庄考察石榴种植园，提出“要做好品牌、提升品质，延长产业链”；
В России ответили на имитирующие высадку на Украине учения НАТО18:04