Method and apparatus for indexing and locating key frames in streaming and variable-frame-length data
US6693959B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 2000 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Mar 3, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/9206
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for indexing and locating key frames in streaming frame data and variable-frame-length data is described. Fast and efficient location of desired key frames in both directions (e.g., forward/backward, future/past) is provided. An estimate of the distance to the desired key frame is made and a seek performed according to that distance. At the location specified by the seek, key frame seek assist data are obtained. The desired key frame is located or a new seek is performed, depending on the key frame seek assist data obtained. By placing the key frame seek assist data at readily identifiable locations, efficient location of key frames is provided. The key frame seek assist data may be tailored to optimize efficiency for seeking in a particular direction, for example, backwards. The seek process is correspondingly configured to favor seeking in the more efficient direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.