Constant bit rate control using implicit quantization values
US9113164B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 2012 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | Jan 26, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Techniques for controlling constant bit rate for a coded video bitstream using implicitly derived quantization values during coding are presented. A decoder component and an encoder component independently track a first subset of quantization-related parameters in relation to coding video frames. The encoder component encodes a macroblock of a video frame using a quantization value based on the first subset of coding parameters and a second subset of coding parameters. The decoder component calculates the quantization value for the macroblock based on the first subset and second subset of quantization-related parameters, the second subset received in a header with the bitstream. The decoder component uses calculated quantization values to adjust quantization levels in relation to decoding macroblocks of a frame to facilitate maintaining constant bit rate control for the bitstream. The second subset of quantization-related parameters includes parameter information other than explicit quantization change information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.