Non-linear quantizer for video coding

H - Electricity – 04 – N

Patent

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H04N 7/30 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2280038

A quantizer and dequantizer for use in a video coding system that applies non linear, piece-wise linear scaling functions to video information signals based on a value of a variable quantization parameter. The quantizer and dequantizer apply different non linear, piece-wise linear scaling functions to a DC luminance signal, a DC chrominance signal and an AC chrominance signal. A code for reporting updates of the value of the quantization parameter is interpreted to require larger changes when the quantization parameter initially is large and smaller changes when the quantization parameter initially is small.

L'invention concerne un quantificateur et un déquantificateur destinés à être utilisés dans un système de codage vidéo appliquant des fonctions d'échelles non-linéaires, linéaires par pièce, à des signaux d'informations vidéo, sur la base d'une valeur d'un paramètre de quantification de variables. Le quantificateur et le déquantificateur appliquent différentes fonctions d'échelles non-linéaires, linéaires par pièce, à un signal de luminance CC, à un signal de chrominance CC et à un signal de chrominance CA. Un code destiné à effectuer des mises à jour de la valeur du paramètre de quantification est interprété pour demander des changements plus grands lorsque le paramètre de quantification est initialement grand, et des changements plus petits lorsque le paramètre de quantification est initialement petit.

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