Method and apparatus for blocking effect reduction

Details Method and apparatus for blocking effect reduction Method and apparatus for blocking effect reduction

H - Electricity

04

N

H04N 7/64 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01) H04N 17/00 (2006.01)

Patent

CA 2345784

By utilising parameters derivable from a compressed bit-stream, measures are obtained of the subjective quality of a decoded picture, without the necessity for reference to source material. A blockiness measure is derived both locally and globally and used to control a de-blocking filter. An estimate of signal- to-noise ratio is derived from quantization values.

En mettant en oeuvre des paramètres dérivables d'un train de bits comprimé, des mesures sont obtenues concernant la qualité subjective d'une image décodée, sans nécessité de se référer à des données initiales. Une mesure de groupage est établie aux niveaux tant local que global et utilisée pour contrôler des filtres de dégroupage. Une estimation du rapport signal-bruit est tirée de valeurs de quantification.

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