On debiasing restoration algorithms: applications to total-variation and nonlocal-means

Bias in image restoration algorithms can hamper further analysis, typically when the intensities have a physical meaning of interest, e.g., in medical imaging. We propose to suppress a part of the bias -- the method bias -- while leaving unchanged the other unavoidable part -- the model bias. Our debiasing technique can be used for any locally affine estimator including â1 regularization, anisotropic total-variation and some nonlocal filters.

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