Method and apparatus for transmitting and recovering video signal

A video signal transmitting apparatus for inserting a plurality of resynchronization markers into groups of blocks (GOBs) to prevent the propagation of errors generated in a transmission channel before a video signal having a hierarchical structure of a frame, the GOBs, and macro blocks is received and recovered, comprising:

• an encoder for encoding image data;
• a frame code storing unit for storing respective CODed macro block indication (COD) values determined by the encoder;
• a frame bitstream storing unit for storing a bit stream generated by the encoder;
• a resynchronization marker generator for determining the number and positions of the resynchronization markers to be inserted into the bit stream based on the COD values stored in the frame code storing portion and generating the resynchronization markers;
• and
• a resynchronization marker inserting unit for inserting the generated resynchronization markers into corresponding positions of the stored bit stream and transmitting the generated resynchronization markers.

A method for recovering a received video signal having a hierarchical structure of a frame, groups of blocks (GOBs), and macro blocks by inserting a plurality of resynchronization markers into predetermined positions of the corresponding GOBs, wherein the positions are determined to minimize the mean error propagation cost based on whether respective macro blocks positioned between the resynchronization markers to be inserted are skipped, to prevent the propagation of errors generated in a transmission channel, comprising:

• detecting an error from a macro block between inserted resynchronization markers;
• deleting recovered data of a section in which the error is detected;
• and
• concealing the error of the section by replacing the deleted data section with the data of the immediately preceding concealed section.