Image processing method and apparatus

摘要

For the purpose of conducting anisotropic diffusion filtering in a shorter time, an image processing method for conducting anisotropic diffusion filtering on a pixel value Ii, j in a two-dimensional image, comprises: finding conduction coefficients Cn, Cs, Cw, Ce, Cnw, Csw, Cne and Cse in eight surrounding directions for each pixel based on a pixel value gradient ∇I to produce a two-dimensional distribution image of the conduction coefficients; and finding pixel value first partial differentials ∇nI, ∇sI, ∇wI, ∇eI, ∇nwI, ∇swI, ∇neI and ∇seI in the eight surrounding directions for each pixel to calculate a pixel value in an output image according to: Ii,jn+1 = Ii,jn+λ[[Cn⁢·∇nI+Cs⁢·∇sI+Cw⁢·∇wI+Ce⁢·∇eI] +12[Cnw⁢·∇nwI+Csw⁢·∇swI+Cne⁢·∇neI+Cnw⁢·∇nwI]]i,jn, (n: the number of times of repetition, λ: a constant).