Rate-distortion optimized coding mode selection for video coders
US6167162A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1999 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Oct 4, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/19
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A new method for real time implementation of rate-distortion optimized coding mode selection is disclosed that can be efficiently applied to H-263-compatible video codecs and other codecs of similar type. A normalized rate-distortion model is used to efficiently compute the rate and the distortion when encoding motion-compensated prediction error signals, instead of performing DCT, quantization and entropy-encoding. A fast algorithm is also disclosed that determines sub-optimal values of coding parameters such as the quantization parameter and the Lagrangian multiplier, .lambda., for the trellis search. Very good rate control and picture quality are achieved, especially when the disclosed techniques are applied in very low bitrate video coding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.