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。

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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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The directional chain code is used to record the contour information data according to the trend of the contour, and this will be very convenient for the smoothing process later on.

采用方向链码记录轮廓信息，它依据轮廓走向的顺序来记录数据，这对以后的光顺处理工作将是十分方便的。

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