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。
Directional smoothing filter is frequently used in digital image processing for it has the double properties of noise filtering and edge preserving.
本文主要提出了基于主方向的平滑算法，并结合平均曲率流算法和法向滤波算法进行了改进。
We present a smoothing algorithm based on the main direction combined with mean curvature flow and normal filter method.
提出并构建了八方向平滑和增强滤波器。
The eight-direction smoothing and enhancing filter are also proposed.
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