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我希望用阈值操作屏蔽一些不同亮度的图片，防止他们干扰到我的图像，我不是希望二值化而是希望类似于opencv一样的截断的操作，（truncate），这个操作。但是、苦于找不到函数。希望求解。并且我希望我阈值选取之后我可以把那一块色块变成白色，不知道应该如何操作，望告知。多谢
https://book.openmv.cc/example/03-Drawing/flood-fill.html