Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-03-19
1993-03-23
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358133, 358141, H04N 712, H04N 704
Patent
active
051969335
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.
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"Principles of Modulation and Channel Coding for Digital Broadcasting for Mobile Receivers", M. Alard and R. Lassalle, EBU Review--Technical No. 224 (Aug., 1987).
Etat Francais, Ministere des PTT
Groody James J.
Metjahic Safet
Telediffusion De France S.A.
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