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sobel过滤器
2022-07-04 22:06:00 【Melody2050】
假如有如图的颜色变换
其像素深度变化可如下图
我们看到其曲线在中间位置的变化是最陡峭的。计算其一阶导数,从下图橙色线进一步观察。
所以,通过计算像素值的导数,可以判断其边界。但图像的像素值是离散的,没法计算导数。所以通过卷积的方式来计算。
用一个如图所示的卷积核,去覆盖一片3x3的区域,就可以捕获水平/竖直方向边沿的特征。
其他细节见原文。
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