Apparatus and method for compressing and expanding multibit digital pixel data
US5081450A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1990 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Mar 9, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/8042
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for converting multibit pixel data to a lesser number of bit pixel data and re-expanding the compressed data. Luminance data for each pixel is established as the 5 most significant bits of the original luminance signal. The chrominance information for groups of pixels is subsampled, and a common chrominance value assigned to each of the pixels in a group. The resulting compressed pixels may be 8 bits wide providing economical possibilities to store the 8 bit wide data. The data is expanded for display by adding lower order data bits to the compressed luminance signal data bits. A subsampled chrominance data signal is appended to the expanded luminance data for display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.