这里讨论利用输入图像中像素的小邻域来产生输出图像的方法，在信号处理中这种方法称为滤波（filtering）。其中，最常用的是线性滤波：输出像素是输入邻域像素的加权和。 1.相关算子（Correlation Operator)       定义：,  即 ，其中ｈ称为相关核(Kernel).　　　　　　　　　　步骤：        1）滑动核，使其中心位于

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