A Non local Variational Formulation for the Improvement of Tone Mapped ImagesReport as inadecuate




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* Corresponding author 1 Image Processing for Enhanced Cinematography DTIC - Department of Information and Communication Technologies Barcelone

Abstract : 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.


keyword : tone mapping non local variational problem perceptual distance just noticeable difference





Author: Praveen Cyriac - Thomas Batard - Marcelo Bertalmío -

Source: https://hal.archives-ouvertes.fr/



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