Patent ID: 7215709

Claim:
A computer readable storage medium in which a computer program is stored, the computer program comprising: means for instructing a computer to demultiplex an alpha-map code and a size conversion ratio information code from an encoded alpha-map signal; means for instructing the computer to decode the alpha-map code to a binary image; means for instructing the computer to up-sample the binary image in accordance with the size conversion ratio information code to output the up-sampled image as a decoded video signal; means for instructing the computer to generate a motion compensation signal on the basis of a previous decoded video signal and a motion vector signal; and means for instructing the computer to down-sample the motion compensation signal in accordance with the size conversion ratio information to output the down-sampled motion compensation signal, wherein the step of decoding decodes the alpha-map code in accordance with the motion compensation signal and the size conversion ratio information.