Video image color encoding
US6301389A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1996 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Jan 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/644
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method is described of encoding pixel color values for a digital video image frame in which each different color within the image is assigned a color value. A predominant color is identified for the image frame and, in a first embodiment (FIG. 5), each pixel having a color other than the predominant color is separately coded as its respective color value (0010 to 1111), with runs of three or more successive pixels of the predominant color being run-length encoded. A further code (0000 0011 cccc), similar in arrangement to that indicating a run, is provided to allow a change in the specified predominant color during the course of a frame. In a further embodiment, runs of all colors are run-length encoded but with a shorter coding scheme for runs of the predominant color or, in a still further embodiment, a small range of predominant colors. A principle use for these coding schemes is to improve efficiency of coding for certain classes of image material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.