Process and device for bite-rate reduction for the recording of images on a video recorder
US5604602A · kind A · utility
20Cited by
9References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 3, 1995 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | May 3, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method comprising breaking an image down into sub-bands, performing a pre-analysis of the image in image blocks, recursively and adaptively assigning the available bit-rate to each pixel in the sub-bands, selecting a quantizer determined by the source probability density and a calculation of the minimum quantizing error variance, and coding each pixel of each signal component in every sub-band according to the selected quantizer. The method is applicable to HDTV digital VCRs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.