METHOD AND DEVICE FOR COMPRESSION OF IMAGE DATA BY MATHEMATICAL TRANSFORMATION AT REDUCED COST OF IMPLEMENTATION, PARTICULARLY FOR TRANSMISSION AT A REDUCED RATE OF IMAGE SEQUENCES

摘要

The objective is to provide a cost-effective method "silicon surface - processing speed" to implement a mathematical transformation of TCD type, on matrices of pixels, suitable for image compression. / P According to the invention, the method essentially consists in combining a permutation 1 of each block of pixels with a set of one-dimensional TFRs 211, 213. A series of variants is obtained by adding or not adding calculation grid steps. 22 of reconstitution of a complex TFR-2D, rotations 3 of reconstitution of the TCD, and / or suppression of the imaginary coefficients. / P