Image enhancement based on nonsubsampled contourlet transform

Based on nonsubsampled contourlet transform(NSCT) and experiment image statistical property which contains uneven illumination,low comparison and high noise,an image enhancement method is presented.Firstly the original image is carried on nonsubsampled contourlet to be decomposed into low and high coefficients sub-band.Then the low frequency is carried on adaptive histogram processing to enhance the contrast of pixels.The high frequency coefficients are classified by threshold and carried on non-linear transformation.Finally the enhanced image can be obtained after inverse NSCT.Experimental results show that such method is not only effective and robust,but also practical.