Compression rate control system and method with variable subband processing
US7525463B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2005 |
| Grant date | Apr 28, 2009 |
| Priority date | — |
| Expiry date | Sep 20, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system, method and computer program product provide finer rate control in data compression by processing a data stream through a plurality of parallel subbands, wherein a first subband processes the data differently than a second subband. Separate shift quantization parameters for each separate run-of-zeros compressed storage area or pile can be provided, instead of a single common shift parameter for every coefficient as in the prior art. The parameter value for each such area or pile can be recorded in the compressed output file. The separate shift quantization parameters can also be adjusted dynamically as data is being compressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.