Patent ID: 9185418
Filing Date: 2015-11-10
Classification: H04N

Abstract:
1. A computing device comprising a processing unit, memory and a storage medium storing computer-executable instructions which, when executed, cause the computing device to perform: encoding enhancement layer video, including varying quantization spatially and between plural color channels of the enhancement layer video for a picture organized in plural color channels, and further including, when unit-level spatial quantization variation is used for the picture, for a current unit of the enhancement layer video for the picture, predicting a unit-level quantization parameter (“QP”) for the current unit using one or more unit-level QPs for spatially neighboring units; and outputting the encoded enhancement layer video in a bitstream, including: signaling in the bitstream information that indicates an on/off decision for unit-level spatial quantization variation for the picture; and signaling in the bitstream QP information that indicates plural QPs that at least in part parameterize the varied quantization of the enhancement layer video for the picture, the QP information including, when unit-level spatial quantization variation is used, the unit-level QP for the current unit signaled in the bitstream as a differential QP relative to the predicted unit-level QP for the current unit, thereby facilitating combination by a video decoder of the differential QP with a prediction of the unit-level QP computed by the video decoder for the current unit.