Video compression
US6625221B2 · kind B2 · utility
12Cited by
2References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2001 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Dec 12, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/39
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An MPEG-2 or other compressed video stream (CP) can be manipulated as separate information bus (IB) and coefficient (CP*) streams. The information bus stream (IB) contains motion vector information but also information derived from a previous decoding operation (14, 18) for use in a subsequent coding operation (22). Processing in the coefficient domain enables bit rate conversion without decoding to the pixel level and also simplifies the combination of MPEG layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.