Modified BM3D algorithm for image denoising using nonlocal centralization prior
We remove the 1D transform across grouped blocks and introduce the nonlocal centralization prior. Both local sparsity of wavelet coefficients and nonlocal similarity can be better utilized. Nonlocal shrinkage functions are developed under different norm restrictions. Such shrinkage functions are verified to be competitive or better than the BM3D algorithm.
denoising nonlocal sparsity wavelet shrinkage block matching