In order to solve the problem that current denoising methods might smooth or lose the significant details of image,a new ultrasound image denoising model based on multiscale nonlinear diffusion (MSND) was proposed.This model combined the strongpoint of redundant Laplace pyramid decomposition and nonlinear diffusion.Redundant Laplace pyramid decomposition was utilized to decompose the image into isometric space-frequency sub-images.The edges and details of the image were well expressed by synthesizing the characteristics of all the sub-images.Then the nonlinear diffusion processing was carried out according to the synthesized characteristics in each sub-image.The experimental results showed that the proposed algorithm was capable of filtering speckle noise efficiently and preserving edges and details of images.
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