05031038 is referenced by 33 patents and cites 2 patents.

Process and device for the compression of image data by a mathematical transformation implemented at low cost, particularly for the transmission at reduced speed of sequences of images.

The objective is to provide an economical method in "silicon area - processing speed" cost to implement a mathematical transformation of the DCT type, on arrays of pixels, suitable for image compression.

According to the invention, the method consists essentially of combining a permutation (1) of each block of pixels with a series of one dimensional FFT (211, 213). A series of variants is obtained by adding or not adding steps of matrix calculation (22) of reconstitution of a complex 2D-FET, of rotations (3) of reconstitution of the DCT, and/or of suppression of the imaginary coefficients.

Title
Process and device for the compression of image data by mathematical transformation effected at low cost, particularly for the transmission at a reduced rate of sequences of images
Application Number
7/510752
Publication Number
5031038
Application Date
April 18, 1990
Publication Date
July 9, 1991
Inventor
Pierre Duhamel
Issy Les Moulineaux
FR
Jean Claude Carlac h
Rennes
FR
Christine Guillemot
Rennes
FR
Agent
Barnes & Thornburg
Assignee
Telediffusion de France
FR
Etat Francais
FR
IPC
H04N 7/133
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