Process and device for the compression of image data by mathemat

Details Process and device for the compression of image data by mathemat Process and device for the compression of image data by mathemat

1990-04-18

1991-07-09

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358136, 364725, H04N 7133

Patent

active

050310380

ABSTRACT:
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.

REFERENCES:
patent: 4302775 (1981-11-01), Widergren
patent: 4708761 (1988-10-01), Daly

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