Video Quantization Parameter Decoding Method And Device

Abstract: A video quantization parameter decoder includes: prediction means for generating a predicted quantization parameter from a past reconstructed quantization parameter; quantization parameter decoding means for binary-arithmetic-decoding a first bin indicating whether or not a delta quantization parameter is significant, a sign bin indicating whether the delta quantization parameter is positive or negative, and other bins indicating an absolute value of the delta quantization parameter; de-binarization means for de-binarizing the first bin, the other bins and the sign bin to generate a delta quantization parameter; and adding means for adding a predicted quantization parameter to the delta quantization parameter to generate a re-constructed quantization parameter, wherein the quantization parameter decoding means performs binary-arithmetic-decoding using no context for the sign bin, using a first context for the first bin and using a second context for the other bins.

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