Model based rate control for predictive video encoder
US7403562B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2005 |
| Grant date | Jul 22, 2008 |
| Priority date | — |
| Expiry date | Jun 11, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A rate control algorithm for a predictive video encoder is provided to accurately control the coding rate while requiring a small complexity. The algorithm assumes the video encoder to consist of two processors, pre-processor and main processor, and the rate control located in main processor uses prediction cost and residual cost for each picture that are computed in pre-processor. Prediction cost represents the estimated number of bits needed to generate an error image, and residual cost describes the difficulty of encoding the resultant error image. Accurate and simple rate control is made possible by using a new rate model that adapts to the local characteristic of a video sequence, and by targeting to maintain the quantization parameter as constant as possible in a given set of pictures, GOP, instead of the conventional two step approach.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.