CPC H04N 19/126 (2014.11) [H04N 19/124 (2014.11); H04N 19/157 (2014.11); H04N 19/174 (2014.11); H04N 19/176 (2014.11); H04N 19/196 (2014.11); H04N 19/197 (2014.11); H04N 19/198 (2014.11); H04N 19/51 (2014.11); H04N 19/513 (2014.11); H04N 19/593 (2014.11); H04N 19/61 (2014.11); H04N 19/139 (2014.11); H04N 19/52 (2014.11)] | 20 Claims |
1. An apparatus, comprising:
a decoder for decoding image data for at least a portion of a picture using a quantization parameter predictor for a current quantization parameter to be applied to the image data, the quantization parameter predictor being determined using multiple quantization parameters from previously decoded neighboring portions,
wherein a value indicative of a difference between the current quantization parameter and the quantization parameter predictor is decoded for use in decoding the image data, and
wherein said quantization parameter predictor is determined by finding the mean of the quantization parameters of the previously d e coded neighboring portion to the left and the previously decoded neighboring portion above the portion currently being decoded when these neighboring portions are available, and
if at least one of said neighboring portions is not available, basing the quantization parameter predictor on a quantization parameter of another portion or on a quantization parameter for a current slice.
|