A color image denoising method based on nonlinear diffusion equation is discussed. On the basis of the three basic requirements of image denoising, the deficiencies of the harmonic term model and the color total variation denoising model are summarized, and the local information constructor of the image is used to make the model anisotropically smooth near the edge of the image and maintain the boundary. Isotropic smoothing is performed in flat areas to prevent the generation of step effects, and the corner point shape is maintained by using the corner point information. Experimental results show that the constructed model can better maintain the geometric structure of the target in the image and has good denoising ability. Keywords: isotropy; anisotropy; total variation model; image denoising
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