METHOD AND APPARATUS FOR RECOVERING AN IMAGE IN A VIDEO TELEPHONE SYSTEM

An image recovery method and apparatus in a video telephone system includes an image compression coding device for coding an analog image signal and for decoding image data received in dependence upon control signals indicative of a mode signal and a frame operator signal; a transmitting/receiving entropy coder/decoder device for compressing, coding and outputting entropy coded data from the image data provided from the image compression coding device, and for decoding, expanding and providing entropy decoded data to the image compression coding device; a network interface device for multiplexing control data and entropy encoded data provided from the transmitting/receiving entropy part to output multiplexed image data to a transmission line, and for de-multiplexing multiplexed data received from the transmission line to provide demultiplexed image data to the transmitting/receiving entropy part and simultaneously extract the control data from the multiplexed data; a controller connected to the network interface device, for controlling the transmission and reception of image data of the network interface device, for supplying a BAS code signal indicative of protocol data requesting an image recovery from a broken image to the network interface part in response to a fast up-date request signal and for outputting a fast up-date request acknowledge signal in response to the control data provided from the network interface device; and a data error detector for providing the fast up-data request signal to the controller in dependence upon a comparison of a length of entropy decoded data and a length of standard data via header codes, and for setting a mode operation of the image compression coding device to an intraframe mode in response to the fast up-date request acknowledge signal provided from the controller.