Chinese Optics Letters, Vol. 5, Issue 3, 156 (2007)
Image denoising exploiting inter- and intra-scale dependency in complex wavelet domain
[in Chinese]1,2and [in Chinese]1
- 1School of Science, National University of Defense Technology, Changsha 410073
- 2Institute of Automation, Chinese Academy of Sciences, Beijing 100080
A new locally adaptive image denoising method, which exploits the intra-scale and inter-scale dependency in the dual-tree complex wavelet domain, is presented. Firstly, a recently emerged bivariate shrinkage rule is extended to a complex coefficient and its neighborhood, the corresponding nonlinear threshold functions are derived from the models using Bayesian estimation theory. Secondly, an adaptive weight, which is able to capture the inter-scale dependency of the complex wavelet coefficients, is combined to the obtained bishrink threshold. The experimental results demonstrate an improved denoising performance over related earlier techniques both in peak signal-to-noise ratio (PSNR) and visual effect.