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
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United States of America Patent
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Jul 9, 1991
Grant Date -
N/A
app pub date -
Apr 18, 1990
filing date -
Apr 18, 1989
priority date (Note) -
Expired
status (Latency Note)
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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.
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