METHOD FOR COMPRESSION AND RECOVERY OF MESSAGES Russian patent published in 2009 - IPC H04N7/30 

FIELD: information technologies.

SUBSTANCE: for compression and recovery of K>1 images, previously, prior to beginning of communication session on transmitting and receiving sides, random square matrix is identically generated with size of m×m elements, values of which belong to the range from -500 to 500, and by G×K, where G>1, random key matrices with size of N×m and m×N of single and zero elements, they form matrix of permitted code groups with size of G×m₁ of single and zero elements, where m₁≤m. Then on transmitting side from K immovable halftone images, K matrices are generated with norm values of N×N size elements and transformed into digital form. Matrices of norm values are represented by rectangular matrix with N×m size of single and zero elements, at the same time the first nil elements of its N line are generated only from elements of permitted code group matrix lines, which are transferred along digital communication channel. On receiving side at first errors are corrected in the first m₁ elements of N line in accepted rectangular matrix, then on the basis of available random square and key matrices and rectangular matrix received after correction of errors, K recovered matrices of norm values are generated with N× size elements, which are used to recover K fixed halftone images.

EFFECT: improved quality of messages recovery on receiving side with preservation of specified speed of information transfer through communication channel.

2 cl, 9 dwg