Patent ID: 9591302
Date: 2017-03-07
CPC Classifications: H04N

Claim:
1. A computing device that implements an image or video encoder, wherein the computing device comprises a processing unit and memory, and wherein the computing device is configured to perform operations comprising: encoding image or video content for which values of quantization parameter (QP) vary according to a relationship between a luma component and chroma components, wherein the encoding includes: wherein variables QP Q and QP P represent luma QP values for blocks on either side of an edge in the at least part of the slice on which deblock filtering is performed, wherein variable cqp_offset represents the picture-level chroma QP offset, wherein the variable qP I is used to determine a variable QP C that is used in the derivation of the control parameter, and wherein values of the control parameter are derived separately for two different chroma components of the picture; and outputting at least part of a bitstream including the encoded content, wherein the picture-level chroma QP offset is separately signaled for the two different chroma components, and wherein bitstream syntax permits signaling of different slice-level chroma QP offsets for different slices of the picture.