Device for coding a picture signal by compression
US5051840A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1989 |
| Grant date | Sep 24, 1991 |
| Priority date | — |
| Expiry date | Dec 12, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A picture signal compression coding device divides picture data into a plurality blocks and subjects the individual blocks of picture data to an orthogonal transform, a normalization, and a coding. The amounts of data to be allocated to the individual blocks are determined on the basis of the ratios of the activities of the individual blocks to a sum of the block-by-block activities, whereby the output of the individual blocks of coded data is restricted. The amount of coded data is allocated in matching relation to the frequency components of the individual blocks, so that more data are distributed to those blocks in which high frequency components are predominant. Further, the number of bits to be assigned to the entire picture is maintained constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.