Invention Grant
- Patent Title: Chroma quantization in video coding
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Application No.: US14452494Application Date: 2014-08-05
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Publication No.: US09294766B2Publication Date: 2016-03-22
- Inventor: Alexandros Tourapis , Guy Cote
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: APPLE INC.
- Current Assignee: APPLE INC.
- Current Assignee Address: US CA Cupertino
- Agency: Adeli LLP
- Main IPC: H04N19/105
- IPC: H04N19/105 ; H04N19/124 ; H04N19/30 ; H04N19/70 ; H04N19/126 ; H04N19/186 ; H04N19/157 ; H04N19/96 ; H04N19/86

Abstract:
A method of signaling additional chroma QP offset values that are specific to quantization groups is provided, in which each quantization group explicitly specifies its own set of chroma QP offset values. Alternatively, a table of possible sets of chroma QP offset values is specified in the header area of the picture, and each quantization group uses an index to select an entry from the table for determining its own set of chroma QP offset values. The quantization group specific chroma QP offset values are then used to determine the chroma QP values for blocks within the quantization group in addition to chroma QP offset values already specified for higher levels of the video coding hierarchy.
Public/Granted literature
- US20150071345A1 CHROMA QUANTIZATION IN VIDEO CODING Public/Granted day:2015-03-12
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