Image processing method and apparatus

Details Image processing method and apparatus Image processing method and apparatus

2007-10-02

2007-10-02

Couso, Yon J. (Department: 2624)

Image analysis

Image enhancement or restoration

Image filter

C382S128000

Reexamination Certificate

active

10862082

ABSTRACT:
An image processing method for conducting anisotropic diffusion filtering on a pixel value Ii,jin a two-dimensional image, comprises: finding conduction coefficients Cn, Cs, Cw, Ce, Cnw, Csw, Cneand Csein 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,jm+⁢λ[[Cn·∇n⁢I+Cs·∇s⁢I+Cw·∇w⁢I+Ce·∇e⁢I]+⁢12⁡[Cnw·∇nw⁢I+Csw·∇sw⁢I+Cne·∇ne⁢I+Cnw·∇nw⁢I]]i,jn,(n: the number of times of repetition, λ: a constant).

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