- Patent Title: Techniques for calculation of quantization matrices in video coding
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Application No.: US15487853Application Date: 2017-04-14
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Publication No.: US10567768B2Publication Date: 2020-02-18
- Inventor: Xiang Fu , Xiaohua Yang , Linfeng Guo , Francesco Iacopino , Krishna Rapaka , Felix Chou , Mukta Gore
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: BakerHostetler
- Main IPC: H04N19/124
- IPC: H04N19/124 ; H04L29/06 ; H04N19/105 ; H04N19/117 ; H04N19/176 ; H04N19/61 ; H04N19/85

Abstract:
Techniques are disclosed for developing quantization matrices for use in video coding. According to these techniques a first quantization matrix may be derived from a second quantization matrix by scaling quantization values of the second quantization matrix by scaling parameters. The scaling parameters may increase according to distance between each matrix position and a matrix origin, they may be derived from characteristics of a video sequence to be coded, or both. The first quantization matrix may be communicated to a decoder. Thereafter, a video sequence may be coded predictively. As part of the coding, pixel data of the video sequence may be transformed to a plurality of frequency domain coefficients, and the frequency domain coefficients may be quantized according to the first quantization matrix.
Public/Granted literature
- US20180302621A1 Techniques for Calculation of Quantization Matrices in Video Coding Public/Granted day:2018-10-18
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