Patent ID: 9451259
Filing Date: 2016-09-20
CPC Classification: H04N

Claim Text:
1. An image quantization parameter encoding method for encoding a quantization parameter for a video encoding process that is based on context-based adaptive binary arithmetic coding, the image quantization parameter encoding method comprising: generating a predicted quantization parameter from a past reconstructed quantization parameter; generating a delta quantization parameter from a quantization parameter and the predicted quantization parameter; and binary arithmetic encoding: (a) a first bin indicating whether the delta quantization parameter is significant; and when the delta quantization parameter is determined to be significant, (b) other bins, which are encoded subsequent to the first bin, indicating an absolute value of the delta quantization parameter, and (c) a sign bin, which is encoded subsequent to the other bins, indicating whether the delta quantization parameter is positive or negative, wherein the binary arithmetic encoding is performed using contexts for the first bin and the other bins, and using no context for the sign bin.