Nonlocal Means-Based Speckle Filtering for Ultrasound Images

There have been many works on localized image de-noising like simple averaging, Gaussian filtering, Median Filtering and also works on non local image de-noising like the work by Buades et al.[1], also then came up the using of Blockwise Non local image de-denoising by Coupe et al.[2] and in the specific case of UltraSound images where the noise is mostly speckle noise the above 2 methods did work quite well but the work by Coupe et al.[3] combining their previous work on Blockwise image filtering and introducing a new patch comparison Pearson Distance proved to be better than the previous works.