Abstract
Previously, we have proposed the three different l^p-l^2 color shrinkage schemes, for p=0, 1 and 2, utilizing inter-channel cross-correlations, and have shown that the l^1-l^2 color shrinkage and the l^1-l^2 color shrinkage improve performance of the color-image denoising in the redundant Haar wavelet domain. Superiority or inferiority in performance of the three color shrinkage schemes depends on prior distributions of true wavelet coefficients to be resotored. To improve color-image denoising in the redundant Haar wavelet domain, this paper studies marginal prior distributions of wavelet coefficients of natural clean color images, and addresses the propriety of the three color shrinkage schemes.
