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Pré-Publication, Document De Travail Année : 2014

A Non local Variational Formulation for the Improvement of Tone Mapped Images

Résumé

Due to technical limitations, common display devices can only reproduce images having a low range of intensity values (dynamic range). As a consequence, the dynamic range of images encoding real world scenes, which is large, has to be compressed in order for them to be reproduced on a common display, and this technique is called tone mapping. Because there is no ground truth to compare with, evaluation of a tone mapped image has to be done by comparing with the original high dynamic range image. As standard metrics based on pixel-wise comparisons are not suitable for comparing images of different dynamic range, non local perceptual based metrics are commonly used. We propose a general method for optimizing tone mapped images with respect to a given non local metric. In particular, if the metric is perceptual, i.e. it involves perceptual concepts, we provide an adequate minimization strategy. Experiments on a particular perceptual metric tested with different tone mapped images provided by several tone mapping operators validate our approach.
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Dates et versions

hal-00986918 , version 1 (05-05-2014)
hal-00986918 , version 2 (09-09-2014)

Identifiants

  • HAL Id : hal-00986918 , version 2

Citer

Praveen Cyriac, Thomas Batard, Marcelo Bertalmío. A Non local Variational Formulation for the Improvement of Tone Mapped Images. 2014. ⟨hal-00986918v2⟩

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