Both nonlinear diffusion and TV method based ROF model are analyzed in this paper

and a basic coupled method for color image is mentioned.In order to remove noise effectively and preserve edges and key details in color image

considering the information of each channel of color image and the advantages of denoising and edges preservation of TV flow and ROF model

a improved channel coupled diffusion model which based on TV flow is proposed

different effects among uncoupled diffusion model

channel coupled diffusion model and improved channel coupled diffusion model are analyzed

and different effects among forward diffusion

TV flow and backward diffusion based on the new model are also discussed.Experimental results show that

1)The improved channel coupled diffusion model is better preserving geometric information such as edges in addition to its effectiveness for image denoising.2)The properties of forward and backward diffusion based on the new model are not changed in color image denoising.