| 摘要 |
PCT No. PCT/EP92/02977 Sec. 371 Date Sep. 3, 1993 Sec. 102(e) Date Sep. 3, 1993 PCT Filed Dec. 12, 1992 PCT Pub. No. WO93/04572 PCT Pub. Date Mar. 18, 1993A method is provided for coding images and originals, for example, for telefax and color television. The method saves hardware and allows the transmission time of information to be shortened, particularly for black and white digital or numeric longitudinal coding. According to the method of the present invention, the same code words are assigned for black and white run-lengths. As discriminating criterion, the input sequence of black and white is used. During coding of several successive white lines, the transmission time can be further shortened by providing the coded number of white lines before or after the code word for the white line. During gray coding, transmission time can further be reduced by subdividing the gray scales or binary code words with deliberate redundancy, if necessary, since in this case many characters occur successively and can be transmitted in the same way as the white lines. During color image transmission, transmission time is further reduced by code multiplexing and, if necessary, by QAM-based transmission, whereas in addition the PAM-coded information is D.C. biased. The sum alternating current thus varies in phases in the range of 90 degrees only. |
