Methods and apparatus for scan block caching
US7672005B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2005 |
| Grant date | Mar 2, 2010 |
| Priority date | — |
| Expiry date | Nov 23, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/41
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for comparing portions of data from a digital raster signal to a plurality of scan blocks of data, where each scan block in the plurality describes either a defined image area or entire image frame is disclosed. Included are a hashing function that calculates hash codes for spatially-defined segments of an incoming raster signal; a recent scan hash table containing hash codes for scan blocks received within a specified time period; a comparator for comparing calculated hash codes for the spatially-defined segments of the incoming raster signal with hash codes stored in the recent scan hash table; a pixel capture and timing module for capturing a digital raster signal; and an output selector for selecting for transmission a compressed form of a scan block, a hash code index, or no data if a scan block exists in a remote frame playout buffer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.