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img.morph(1, [+2, +1, +0, +1, +1, -1, +0, -1, -2]) # 浮雕图像
这个是morph操作, 也叫卷积, 3x3的数组是卷积核。
在 数字图像处理的书里都有。
https://baike.baidu.com/item/卷积核/3377590