Patent ID: 9635364
Date: 2017-04-25
CPC Classifications: H04N

Claim:
1. A method of encoding video comprising: dividing a portion of a picture into a plurality of non-over-lapping blocks; determining a minimum quantization-parameter-coding-unit size for the plurality of non-over-lapping blocks for which a first quantization parameter will be determined; determining a quantization parameter for a first region formed from at least one of the plurality of non-over-lapping blocks; determining a predicted quantization parameter for the first region by finding an average value of a quantization parameter of an immediate left neighboring non-over-lapping block of the first region and a quantization parameter of an immediate top neighboring non-over-lapping block of the first region; determining a delta quantization parameter for the first region that is related to a difference between the quantization parameter of the first non-over-lapping block and the predicted quantization parameter of the first non-over-lapping block; encoding the delta quantization parameter into a bit stream if the size of the first region is greater than or equal to the minimum quantization-parameter-coding-unit size; and encoding the quantization-parameter-coding-unit size into the bit stream at a picture level.