Encoding and transmission method with at least two levels of quality of digital pictures belonging to a sequence of pictures, and corresponding devices
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 23, 1993
Grant Date -
N/A
app pub date -
Mar 19, 1991
filing date -
Mar 23, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An encoding and transmission method with at least two levels of quality of digital pictures, each digital picture being formed by at least one matrix of encoded picture elements, wherein each of the pictures is cut up into blocks of picture elements, a reversible mathematical transformation is applied to each of the blocks of picture elements, the coefficients of the transformed picture blocks are quantized and the quantized coefficients are encoded. The transformed coefficients are divided into at least two digital trains, the first train including basic coefficients enabling the reconstruction of a standard quality picture, and at least one second digital train including a set of complementary coefficients enabling the reconstruction of higher quality pictures, in combination with the basic coefficients of the first digital train and possibly the coefficients of other complementary digital trains, the digital trains being processed and/or used distinctly, during the encoding. This enables notably the transmission of digital images that can be received, on the one hand, by moving receivers, especially under difficult reception conditions and, on the other hand, by fixed receivers requiring high image quality.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully