Systems and methods for playing digital video in reverse and fast forward modes
US7620294B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2005 |
| Grant date | Nov 17, 2009 |
| Priority date | — |
| Expiry date | Oct 17, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/8045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Replaying a compressed digital video stream in fast-forward and reverse modes at varied playback rates. An index of intercoded frames, those frames not dependant on other frames for generation, is stored. The index includes the size of interceded frames and their storage location. When a specified playback rate is requested, the interceded frames are retrieved using the index. The intercoded frames then have one or more intracoded frames, frames that reference other frames for generation, placed between them to generate a frame sequence. The intracoded frames are “blank,” meaning they contain only information from their associated intercoded frame. By inserting “blank” frames specified playback rates and bit rates are generated. The index of interceded frames may also be accessed to generate playback in reverse mode, which conserves memory resources of associated systems by generating the reverse playback stream in an iterative manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.