Method and apparatus for generating CLUT-format video images
US5381180A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 16, 1993 |
| Grant date | Jan 10, 1995 |
| Priority date | — |
| Expiry date | Aug 16, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for generating a video image by converting full-resolution three-component video data into color-look-up-table (CLUT) index data. The three-component video data are processed to generate N-bit index data for a lookup table that maps to M-bit CLUT index data, where M is less than N. The M-bit CLUT data is then used to generate the video image. In a preferred embodiment used to generate video images from subsampled video data, subsampled video data (e.g., in YUV-9 or YUV-12 format) is first upsampled (e.g., by replication or interpolation) to generate the full-resolution three-component video data. In a different preferred embodiment used to generate dithered video images, the processing of the full-resolution three-component data involves adding noise, truncating the three "noisy" components, and combining the three truncated "noisy" components to generate the N-bit lookup table index data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.