PURPOSE: To transmit an image with a plurality of gray values and/or colors by converting separately bit values with equal binary position of a group of pixel values by run length coding, sending the run length code, and allowing the run length code to provide specific binary position bits after decoding. CONSTITUTION: A carrier 2 is scanned by an optical scanner 4 in pixel sequential in a sequential image line, an analog scanning value is fed to a quantization device 6, a digital scanning value reproduced by a hierarchical binary code is fed to a pre-processing unit 8. The pre-processing unit provides a binary word to a memory 10, and given to a storage location in the word parallel mode. After the scanning of one image line is finished, contents of different binary location are fed to a run length encoder 14 by a changeover switch 12 at all times. The received data are re-converted into a coded run length by a demodulator 26 at a receiver side and given to a specific binary position bit of a binary word of a group of pixels. Thus, a plurality of gray color tones or color components are transmitted.
IMAGE TRANSMISSION METHOD AND DEVICE