Data compression
US6812865B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 2003 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Apr 1, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data compression apparatus includes a source detection arrangement for detecting whether or not the input data is source data that has not undergone a previous compression/decompression cycle; a data quantity generator, responsive to the source detection arrangement, for setting a desired data output quantity for the compressed data, the desired data quantity having a first value for source input data and a second, higher, value for non-source input data; a target allocator for allocating a target data quantity to respective subsets of the input data in dependence upon the desired output data quantity, the target data quantities together providing a desired output data quantity; and a data compression arrangement for compressing each subset of the input data in accordance with its respective target data quantity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.