Image Denoising Algorithm Based on Improved Contourlet Transform

In the contourlet transform, the image obtained by Laplacian Pyramid(LP) decomposition may produce artifacts on singularity of signal, which is harmful to image denoising. Due to the lack, a new LP decomposition is proposed and it can suppress the artifacts around the edge effectively. The new LP is used to implement the improved contourlet transform. Denoising experiments for Lena image using adaptive threshold show that denoising performance of the improved contourlet transform outperforms the contourlet transforms both in peak signal-to-noise ratio and visual quality.