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Title : Demosaicing First or Denoising First?
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Demosaicing First or Denoising First?

University of Inner Mongolia, China, and CNRS, France, publish a paper "A Review of an Old Dilemma: Demosaicking First, or Denoising First?" by Qiyu Jin, Gabriele Facciolo, and Jean-Michel Morel.

"Image denoising and demosaicking are the first two crucial steps in digital camera pipelines. In most of the literature, denoising and demosaicking are treated as two independent problems, without considering their interaction, or asking which should be applied first. Several recent works have started addressing them jointly in works that involve heavy weight neural networks, thus incompatible with low power portable imaging devices. Hence, the question of how to combine denoising and demosaicking to reconstruct full color images remains very relevant: Is denoising to be applied first, or should that be demosaicking first? In this paper, we review the main variants of these strategies and carry-out an extensive evaluation to find the best way to reconstruct full color images from a noisy mosaic. We conclude that demosaicking should applied first, followed by denoising. Yet we prove that this requires an adaptation of classic denoising algorithms to demosaicked noise, which we justify and specify."

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