Method and apparatus for controlling intra-refreshing in a video telephony communication system

A reception apparatus for requesting intra-refreshing in a video telephone communication system, the apparatus comprising:

• an error detection block for checking a Cyclic Redundancy Check (CRC) attached to received video data to detect an error, and checking a sequence number of the received video data;
• a decoder for decoding the error-detected video data to check frame type information;
• and
• a controller for generating a control signal for requesting intra-refreshing in accordance with the checked frame type information and the sequence number, and transmitting the generated control signal for requesting intra-refreshing to a transmission apparatus.

A method for transmitting by a transmission apparatus an I-frame obtained by compressing an independent image in response to a request for intra-refreshing in a video telephone communication system, the method comprising:

• determining whether a control signal for requesting transmission of an I-frame obtained by compressing an independent image is received from a reception apparatus;
• checking frame type information and a sequence number of video data being compressed;
• determining whether to transmit a temporary I-frame corresponding to the received control signal or to transmit an I-frame based on a predetermined period, in accordance with the checked frame type information and the sequence number;
• and
• transmitting the I-frame to the reception apparatus using a variable time according to the determination.