Method and apparatus for transfer of image data

摘要

At the transmitter section the image data is subject to a source image encoding by the JPEG method and picture elements(MCU) are compressed. One or more of such MCUs are taken as one transmission block and the transmission blocks thus obtained are transmitted in each HDLC frame via the modulator 4 to the demodulator 6 over the transmission line 5. The output signal e from the demodulator 6 is supplied to the HDLC frame disassembler 33 in which the signal e having been received and demodulated in FCS sequence is partitioned into HDLC frames and each frame is checked for any error based on the error correction data thereof. If no error is detected, the transmission block in the HDLC frame is disassembled into individual MCUs and delivered. If an error is detected in any HDLC frame, data in the transmission block in that frame is discarded and a signal t indicative of the error is delivered to the block substitution unit 32. The discarded data is replaced by data u from the substitution block extracted from memory 34 by the block substitution unit 32, disassembled into individual MCUs and delivered.