Bit rate control using short-term and long-term performance characterization
US5832125A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1995 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Dec 7, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The performance of video encoding is characterized both over the short term (e.g., based on the previous encoded frame) and over the long term (e.g., based on the previous n encoded frames). An encoding parameter (e.g., the global quantization level) is selected for the current frame based on the short-term and long-term performance characterizations and the current frame is encoded using that selected encoding parameter. In a preferred embodiment, the global quantization (Q) level is permitted to change for only certain (i.e., adjustable) frames. In addition, the global Q level for key frames is generated using special processing which tends to allow the key frames to be encoded using more bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.