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.
用产品经理的心态对待咖啡，不断迭代好喝的咖啡。公众号：咖啡平方
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Handguns, assault rifles and improvised explosive devices were recovered from the speedboat, along with other tactical gear, according to the statement.