H.264 / avc video synthesis method and apparatus in a compressed domain

Discloses a video synthesis method and device according to the H.264 / AVC compression area. The image combination method, without having to perform decoding of a bit stream of a plurality of the inputted input image, a bit stream of the composite image reconstruction, in whole or in part, the same H.264 / AVC format and an input image of a plurality of input image to generate outputs. In this method, it performs a first parsed bitstream for each of the sequence parameter set (SPS), Picture Parameter Set (PPS), and slice header of the H.264 / AVC format for the received plurality of the input image. And to change some of the parameters and variables of the SPS, PPS, and slice header, or set to the new so as to correspond to the display type of the synthesized image. Parameters and variables are changed or set is related things like display form of the synthetic image is changed or set to the display form of the composite image. Changes in syntax and parameters, such as is done in the compressed domain. And it generates and outputs a bit stream of the H.264 / AVC format for a composite image including the changed or reset the parameters and variables. H.264 / AVC, image synthesis, PPS, SPS, NAL, NALU