Systems and methods for playing digital video in reverse and fast forward modes
US6970640B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 2001 |
| Grant date | Nov 29, 2005 |
| Priority date | — |
| Expiry date | Mar 25, 2024 |
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 interceded frames, those frames not dependant on other frames for generation, is stored. The index includes the size of intercoded frames and their storage location. When a specified playback rate is requested, the intercoded frames are retrieved using the index. The interceded 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 interceded 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.