IEEE Trans Image Process - Symmetric smoothing filters from global consistency constraints.

Tópicos

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Resumo

Many patch-based image denoising methods can be viewed as data-dependent smoothing filters that carry out a weighted averaging of similar pixels. It has recently been argued that these averaging filters can be improved using their doubly stochastic approximation, which are symmetric and stable smoothing operators. In this paper, we introduce a simple principle of consistency that argues that the relative similarities between pixels as imputed by the averaging matrix should be preserved in the filtered output. The resultant consistency filter has the theoretically desirable properties of being symmetric and stable, and is a generalized doubly stochastic matrix. In addition, we can also interpret our consistency filter as a specific form of Laplacian regularization. Thus, our approach unifies two strands of image denoising methods, i.e., symmetric smoothing filters and spectral graph theory. Our consistency filter provides high-quality image denoising and significantly outperforms the doubly stochastic version. We present a thorough analysis of the properties of our proposed consistency filter and compare its performance with that of other significant methods for image denoising in the literature.

Resumo Limpo

mani patchbas imag denois method can view datadepend smooth filter carri weight averag similar pixel recent argu averag filter can improv use doubli stochast approxim symmetr stabl smooth oper paper introduc simpl principl consist argu relat similar pixel imput averag matrix preserv filter output result consist filter theoret desir properti symmetr stabl general doubli stochast matrix addit can also interpret consist filter specif form laplacian regular thus approach unifi two strand imag denois method ie symmetr smooth filter spectral graph theori consist filter provid highqual imag denois signific outperform doubli stochast version present thorough analysi properti propos consist filter compar perform signific method imag denois literatur

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