two pixels, speeding up the algorithm by a factor of 50 while preserving comparable quality of the result. See also Anisotropic diffusion Digital image processing Noise reduction Nonlocal operator Signal processing Total variation denoising Bounded variation Total variation References External links Recent trends in denoising tutorial Non-local image denoising, with code and online demonstration Patents citing 2005 IEEE paper where NLM was claimed as a new technique Image processing Image noise reduction techniques