Frame-level rate control for video compression
US6141380A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 20, 1998 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Nov 20, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/895
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The algorithm assumes a constant bit rate over a timing window of specified duration (e.g., a specified number of consecutive frames), where the current frame to be encoded lies in the interior of the timing window. A target bit rate for the current frame is initially selected by calculating the number of bits already used to encode other frames within the window and then assuming that the remaining available bits allocated to the timing window will be evenly distributed to the remaining unencoded frames in the timing window. The target bit rate may then be optionally adjusted based on scene content, encoder state, and buffer considerations. Through a combination of target bit allocation and frame skipping, spatial and temporal resolutions are maintained within acceptable ranges while meeting buffer delay constraints. The algorithm has also been extended to include PB frames in addition to P-only coders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.