Image compression by optimal reconstruction
US5534925A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 1994 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | May 2, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/86
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of producing a video image from a compressed version of a source video image which has been compressed by transforming to a transform domain and quantizing the source video image in accordance with quantization constraints, including back-transforming from the transform domain and dequantizing the compressed version to produce a decompressed video image, reducing total variation in the first decompressed video image to produce a reduced variation image, transforming the reduced variation image to produce a revised transform and conforming the revised transform with the quantization constraints of the compressed version so as to produce a constrained transform, and back-transforming the constrained transform so as to produce a replica of the source video image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.