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, and wherein in the case where a value of the first bin is zero, the delta quantization parameter is not significant, and in the case where the value of the first bin is one, the delta quantization parameter is significant. Fig. 14

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