Lucas Lucena Gambarra,  José Antonio Gomes de Lima,  Hamilton Soares da Silva,  Leonardo Vidal Batista,  Yuri Gonzaga G. da Costa. 

The problem of noise removal is a critical issue in image restoration because it must maintain the integrity of relevant image information. Considering all the necessary tasks for a quantitative analysis of images, the noise removal is an essential step to increase their quality and improve theperformance of such analysis. For non-local means (NLM) denoising approach presented by Buades et al., notable denoising results are obtained at the expense of high computational cost. This paper proposes a hardware implementation of the NLM algorithm with less computation time. Besides being faster than the software approach, this implementation produces comparable results in terms of mean-squared error (MSE) and perceptual image quality.

http://www.lbd.dcc.ufmg.br/colecoes/wcas/2012/004.pdf

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