Method for the coding of color images at high compression rate without filtering, corresponding decoding method, coder, decoder and applications
US5293228A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | May 15, 1992 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | May 15, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/044
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for the coding of images represented by source signals by means of which a luminance signal is formed by linear combination, using positive coefficients of the source signals, and at least one color signal, the luminance and color signals being digitized, sampled at the same resolution, and subjected to a reversible mathematical transformation in the frequency domain. The method comprises the steps of quantizing and assigning a code value to the continuous component and to each component of a set of alternating components of the transformed luminance signal, and quantizing and assigning a code value to only the continuous component of each of the transformed color signals, a set of alternating components being reconstructed by estimation during the decoding for each of the transformed color signals. The method can be applied to color images of any type represented as the superimposition of monochromatic images, whether the images are still images or motion images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.