Forced intra-frame coding method.

摘要

A forced intra-frame coding method in which video data is coded in the vertical direction of a frame and the coding is performed for forcibly intra-frame coded macro block (MB) lines set to have a predetermined vertical interval. Whenever the coding for respective frames is finished, the macro block lines are shifted downward by one macro block so that the original image is restored relatively rapidly. Furthermore, the coding direction of macro blocks is set to be vertical so that the amount of data for respective macro blocks stays uniform and the transmission buffer of a coder is easily controlled.