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Estimer, mesurer et corriger les artefacts de compression pour la télévision numérique

Abstract : The compression of image data is mandatory for the TV broadcast but generates a number of artefacts. In order to increase the overall image- quality, each correction for a given artefact has to be efficient, reliable and should use low cost operators in order to limit the processing time prior to the image display. To reach this compromise, this study is divided in 3 parts : artefacts estimation, measurement and correction.
We define the problematic of this work by estimating the most annoying artefacts and the risks of their corrections : how can we correct the blocking and the ringing effects, that are typical compression artefacts, still limiting the blur effect which is the main artefact of the correction ?
These artefacts can be measured by objective metrics which are themselves validated by subjective tests. Based on the study of state-of-the-art solutions and on our analysis of the human perception of these artefacts, we develop two new metrics, the BLE (Block Level Estimator) and the BluM (Blur Metric) which are respectively able to evaluate the blocking and the blur effects in an image.
These metrics can be used to validate and to help controlling the corrections. Consequently, we propose new modules to improve existing corrections, to increase their reliability and that can be easily plugged into current solutions. Then, to solve our initial problem, we integrate these modules within a new complete solution, named SQDSE (Studio Quality Digital Source Enhancement), for the correction of the blocking and ringing effects. Its structure and its successful validation both by visual tests and by the BluM and BLE objective quality metrics show that the SQDSE meets all our initial requirements in terms of efficiency, reliability and simplicity.
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https://tel.archives-ouvertes.fr/tel-00229416
Contributor : Frédérique Crété-Roffet <>
Submitted on : Thursday, January 31, 2008 - 10:21:52 AM
Last modification on : Thursday, November 19, 2020 - 12:59:38 PM
Long-term archiving on: : Monday, May 3, 2010 - 3:38:48 PM

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  • HAL Id : tel-00229416, version 1

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Frédérique Crété-Roffet. Estimer, mesurer et corriger les artefacts de compression pour la télévision numérique. Traitement du signal et de l'image [eess.SP]. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00229416⟩

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