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.
据多家外媒报道，其中一名袭击者为24岁的澳大利亚公民纳维德·阿克拉姆，他在现场被捕，随后被送往悉尼的一家医院。另一名袭击者是他的父亲萨吉德·阿克拉姆，他于1998年来到澳大利亚，被警方当场击毙。，推荐阅读快连下载安装获取更多信息
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Video from the incident shows a large group of people following police officers, showering them with snowballs and jeering, as they retreat to their vehicles outside the park. Videos also showed officers shoving at least two people to the ground while getting hit from all directions by snowballs.