Patent ID: 7768580

Claim:
An image display delay time shortening apparatus during channel change, the apparatus comprising: a detector configured to extract a program identifier (PI) and a sequence header from data stream and video stream initially input following a broadcasting channel change and to output the PI and sequence header; a memory storing the PI and the sequence header; a controller configured to extract the sequence header previously stored in the memory corresponding to the PI if there is no sequence header in front of the video stream initially input from the detector following the broadcasting channel change as a result of discrimination based on an output of the detector, and the PI stored in the memory is identical with a current PI extracted by the detector; and a sequence header inserter configured to insert the sequence header extracted by the controller into the video stream and to output the video stream inserted by the sequence header, wherein the controller is configured to compare the PI stored in the memory and the current PI extracted by the detector in response to a broadcasting channel change.