Bandwidth scaling of a compressed video stream
US6438168B1 · kind B1 · utility
57Cited by
5References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 23, 2001 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Jun 23, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/6405
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An original previously compressed video stream image having a first level of compression including a first level of quantization is decompressed, and a set of original motion vectors for each P source picture and for each B source picture is recovered and saved. The decompressed video stream image is re-compressed re-using the most relevant saved original motion vectors in order to create a re-compressed video stream image having a second level of compression including a second level of quantization. The most relevant motion vectors point out to the camera movement and to the moving objects within the original reference frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.