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想要遍历图片中所有颜色的阈值，和已知的阈值相比较，但是在遍历图片中的阈值的时候应该调用什么函数呢，就是遍历图片中的颜色返回threshold的值和已知的threshold相比较，求大佬解答
https://book.openmv.cc/example/10-Color-Tracking/image-histogram-info.html
直接用直方图就行了。