Patent ID: 6577679
Filing Date: 2003-06-10
Classification: H04N

Abstract:
A method for transcoding a coded object-based picture signal representing a picture to a coded block-based picture signal representing the picture, the method comprising:culling, from the coded object-based picture signal, signal portions that represent objects not visible in the picture to generate a culled object-based picture signal wherein the object-based picture signal includes, for each of the objects, an object descriptor comprising a coded amplitude descriptor including interior tiles and boundary tiles, in which culling signal portions that represent objects not visible in the picture includes: culling signal portions that represent objects that are not present in the picture; and culling signal portions that represent objects that are present in the picture, but are hidden includes culling, from the object-based picture signal, signal portions that represent interior tiles and boundary tiles that are hidden in the picture; partially decoding portions of the culled object-based picture signal and generating therefrom blocks of a partially-coded block-based picture signal, the blocks having differing coding states; and re-encoding the partially-coded block-based picture signal to generate the coded block-based picture signal in which the blocks have a uniform coding state.