An improved enhancement approach based on anisotropy differential used for SAR image
Xiaowei Wang · Journal of Optoelectronics·laser · 2010
Synthetic aperture radar(SAR) image after speckle suppression,the edge of the target image will appear fuzzy.In this paper,an improved enhancement approach based on anisotropy differential used for SAR image is proposed,two distribution functions are structured with gradient diffusion coefficient in gradient direction and vertical one in this paper.In non-target region,the extent of the spread is equal to all directions,and the speckle noise has a better inhibitory effect;in the target region,in order to protect and enhance edge,the edges in gradient direction are does not smoothed,and while in vertical gradient one,the edges have a greater smoothing highlight to perpendicular.Experimental results show that the method has both very good speckle suppression edge and enhancement capacity.