Method and apparatus for compressing and extending an image
US5357584A · kind A · utility
14Cited by
6References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 1, 1993 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Feb 1, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/152
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image evaluation circuit is connected to an image compression circuit and an image extension circuit. In the image evaluation circuit, original image data and extended image data reproduced from compressed image data are compared in each block pixel by pixel to generate block noise. The comparison is carried out twice to provide two block noises by two compression factors, and an optimum compression factor is determined in accordance with the two compression factors and the two block noises.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.