关键词: 各向异性扩散, 斑点噪声, 扩散系数

Abstract: Coherent optical images often suffer from speckle noise.An anisotropic diffusion scheme is proposed to tackle the problem of image restoration in coherent optical image processing.The diffusion coefficient in the proposed algorithm theoretically satisfies the conditions for the design of diffusion coefficients presented by Charbonnier，et al.At the same time，this paper combines the modified anisotropic diffusion scheme with logarithmic transformation to restore the original appearance of coherent image.Experimental results show that compared with the SRAD，Lee，Frost，Non-local Means，BLS-GSM and BM3D method，the proposed anisotropic diffusion scheme can effectively remove speckle noise in coherent optical image and preserve the edge and texture features.

Key words: anisotropic diffusion, speckle, diffusion coefficient