With the summary and analysis of available anisotropic diffusion algorithms, a new adaptive diffusion algorithm based on image characteristics is presented.
通过对目前非线性扩散算法的分析、总结，提出了基于区域特征分析的地形图图像自适应平滑算法。
2
To preserve image features, the nonlinear diffusion coefficients are locally adjusted according to the directional derivatives of the image.
而且为了保持图像特征，利用图像的方向导数局部地调整非线性扩散系数。
3
Finally, it gave an image de-noising algorithm of coherence enhancing diffusion, which used wavelet coefficients to estimate the image edge according to the wavelets time-frequent analysis function.