Color image data and control bit compression scheme with run length encoding
US6721456B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 2000 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Feb 23, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/46
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of compressing pixel information is described. The pixel data is received in a data stream and compressed into a compressed data format by identifying a run of consecutive bytes of the data stream based on the similarity of the consecutive data bytes in the data stream. A mode bit of a compression byte is used to indicate whether a run of consecutive bytes is identified. Count bits of the compression byte are used to indicate the number of times the data bytes are repeated and zero counts may be used to indicate particular types of runs, for example, runs to the end of a scan line and the end of an object. Where a pixel byte is represented by 8 bits, the data stream may be compressed in multiples of four bytes at a time. If a pixel is represent by less than 8 bits, the compression method may look for repetitions of similar bytes one byte at a time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.