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.
第二十六条 在确保国家安全的前提下，国家允许核燃料循环产业相关企业有效利用资本市场，逐步形成核燃料循环产业多元化投入机制。
，更多细节参见91视频
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The previous posts in this series built detection around TR39’s binary confusable map: a character either is or isn’t confusable. confusable-vision provides the empirical data to move beyond binary.