We propose an improved anisotropic diffusion method based on the human visual model to gradient threshold for the diffusion coefficients.First

we studied the evaluation of gradient thresholds for anisotropic diffusion coefficient based on the primal PM equation.Through analyzing Weber’s law according to the bionics principle and based on the background

the image brightness was divided into different regions.The gradient thresholds for the different areas were calculated according to the different equations.Then

we discussed the discrete implementation of the proposed method for the eight neighborhoods.The simulation results indicate that the proposed method not only preserves the image information better

but also suppression the noise more satisfactory.