Concerning the defects of multi-scale threshold on directional information using Contourlet transform,a new adaptive threshold denoising algorithm was proposed,which was based on average energy of neighboring window.According to the distribution of the coefficients energy,the Contourlet coefficients were divided up into three areas.The noise could be reduced obviously by adjusting the threshold of these areas with different variables.In contrast with the wavelet threshold,Contourlet threshold and multi-scal...