Kodierverfahren zum Erhöhen der Effektivität der Datenkompression während der Übertragung oder der Abspeicherung von Bildsignalen

摘要

A coding method for increasing the compressing efficiency during transmissions or storing of video data is disclosed. The device for carrying out the coding method includes a CPU (10), a ROM (20), a RAM (30) and a zig-zag scanning section (40). In carrying out the coding method, first, run fields, a count and a coefficient number is initialized. Then ac coefficients are zig-zag scanned, and the ac coefficients are checked as to whether they are 0 or not. If the ac coefficients are not 0, the run field and the count are increased by 1, and the non-zero coefficients are grouped together. The non-zero coefficients are coded, and an EONZ code is outputted to indicate the completion of the coding of the non-zero coefficients. Then the run field for the ac coefficients is coded. According to the present invention, the size of the coding table becomes smaller, the average length of the code word can be shortened, and the encoding and decoding can be carried out in a simpler manner. <IMAGE>