Image encoder and image decoder
US6256449A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1998 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Feb 17, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an image encoder and an image decoder of an image transmission system, enabling the deterioration of decoded images in image quality to be avoided, the color frame information D.sub.CF in separating a predetermined video signal into a luminance component and a color component (chroma component) is extracted prior to the compressive encoding processing of a video signal S.sub.SDI1, added after the compressive encoding processing and delivered to transmission means 18A, and moreover the color frame information is extracted prior to the decoding processing of the compressed video signal S.sub.SDDI1 obtained from the transmission means 18A and is added after the decoding processing, thereby enabling data on color frame information D.sub.CF to be added to the decoded video signal S.sub.SDI1 after the decoding processing as they remain invariant free from deformation (loss) and delivered to the transmission means. Thus, a playback video signal (composite video signal) S.sub.OUTA can be obtained using the color frame information in the decoded video signal S.sub.SDI1 and therefore the deterioration of playback images can be prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.