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extract2, when we know the final size of the slice, we do one heap
。关于这个话题，Line官方版本下载提供了深入分析
if(!(h=cursor[classno])) {
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.
Силовые структуры