Video quality measurement

H - Electricity – 04 – N

Patent

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H04N 17/00 (2006.01)

Patent

CA 2506664

A measure of quality of compressed video signals is obtained without reference to the original uncompressed version, but generated directly from the coded image parameters, thereby avoiding the need to decode the compressed signal.A first measure is generated (3) from the quantiser step size and a second generated (10, 11) as a function of the number of blocks in the picture that have only one transform coefficient NC. The two measures are combined at 414. Adjustments may be made to the step-size based measure to compensate for spatial or temporal masking effects.

Selon l'invention, une mesure de qualité de signaux vidéo compressés est obtenue sans référence à la version d'origine non compressée, mais produite directement à partir des paramètres d'image codée, ce qui permet d'éviter d'avoir recours au décodage du signal compressé. Une première mesure est produite (3) à partir de la taille de l'échelon de quantification et une seconde mesure est produite (10, 11) en fonction du nombre de blocs dans l'image qui ont un seul coefficient de transformée N<SB>C</SB>. Les deux mesures sont combinées en 414. Des réglages peuvent avoir lieu sur la mesure basée sur la taille de l'échelon afin de compenser les effets de masquage spatial ou temporel.

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