ADPCM recompression and decompression of a data stream of a video image and differential variance estimator
US6023295A · kind A · utility
35Cited by
1References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1997 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | Sep 9, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The video memory requirement of an MPEG decoder, or of an SQTV processor, or of similar devices, wherein the storing of full pages or pixels or portions thereof is performed in decoding or in filtering noise, may be dynamically reduced by ADPCM recompressing and decompressing of the MPEG decoded digital data stream, before and after storing the data in the video memory, respectively. A particularly efficient and simple ADPCM compression method employs a differential variance estimator which, instead of processing bidimensional blocks of pels, instead processes blocks of pels all belonging to a same horizontal video line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.