Directional smoothing filter is frequently used in digital image processing for it has the double properties of noise filtering and edge preserving.
方向平滑滤波器兼有去噪和边缘保持的双重特性，在数字图像预处理中被经常采用。
This paper has proposed a optimal smoothing filter for directional filtering and image restoration, based on the maximum energy criterion.
本文从最大能量准则出发，得到了一种用于方向滤波和方向增强的平滑滤波器。
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