G - Physics – 06 – F
Patent
G - Physics
06
F
354/72
G06F 3/18 (2006.01) H04N 7/30 (2006.01)
Patent
CA 1089100
ABSTRACT OF THE DISCLOSURE A matrix transform system for coding and decoding images. The system comprises means for sampling the lines and the columns of an image and forming with these samples a sample square matrix and storing the same. This sample square matrix is splitted into component square matrices of order 3N x 3N having a central part of order N x N. Each of these component matrices is multiplied by a first rectangular coefficient matrix of order N x 3N having a square central part in which the coefficients are equal to unity and two square lateral parts in which the coefficients are selec- tively equal to zero and a predetermined factor smaller than unity, which gives an intermediate matrix of order N x 3N. This inter- mediate matrix is multiplied by a second rectangular coefficient matrix of order 3Nx N which is the transpose of the first rec- tangular coefficient matrix, which gives an output matrix of order N x N which is the tranform of the central part of the component matrix. If N = 2, the output matrix is of order 2 x 2 ; one of its terms depends on four samples of the image, two of its terms depend on twelve samples of the image and the last of its terms depends on thirty six samples of the image.
263732
Jolivet Jean-Claude
Stouls Francois X.
Robic Robic & Associes/associates
Societe Anonyme de Telecommunications
LandOfFree
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