Visual Quality Measure of the Compressed Images
Mesure de la Qualité Visuelle des Images Compressées
OPEN ACCESS
This article presents a visual quality measure of the compressed monochrome image. This measure uses a reference image. The originality of this measure is based on the weighting of the Standard measures by a local error density, calculated on the windows overlapping the image. The local error computation is based on the contrast, the structure and the quantification criteria. Actually, this method is compared with standard PSNR (Peak Signal to Noise Ratio) and MAE (Mean of Absolute Error) measures, weighted by the simplified Daly model [6], and Fränti [9] methods. The results of our measure are reliable, compared with the methods mentioned above. The results are then evaluated in terms of the correlation measure with the Mean Opinion Score (MOS).
Résumé
Cet article présente une méthode de mesure objective de la qualité visuelle des images monochromes dégradées par des schémas de codage. La méthode développée se classe dans le cadre des méthodes utilisant une référence. L’originalité de la méthode repose sur la pondération des mesures standards par une densité d’erreur locale calculée sur des fenêtres d’analyse recouvrant l’image. Le calcul de cette densité se base sur trois critères qui sont le contraste, la structure et la quantification. D’autres méthodes, telles que les mesures standards PSNR (Peak Signal to Noise Ratio) et EAM (Erreur Absolue Moyenne), pondérées par le modèle de Daly simplifié [6], et la méthode de Fränti [9], sont décrites dans cet article. Les résultats des différentes méthodes de mesure sont comparés entre eux. La mesure proposée est la plus fiable en terme de coefficient de corrélation avec la mesure subjective pour l’ensemble des images testées.
Quality assessment, objective quality, Mean Opinion Score (MOS), image compression, distortion measures.
Mots clés
Qualité objective, qualité subjective, évaluation de la qualité, Mean Opinion Score (MOS), codage d’image, mesure des dégradations, coefficient de corrélation
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