Patent ID: 6292514
Filing Date: 2001-09-18
Classification: H04N

Abstract:
A computer program product for operating a computer, comprising:a computer readable medium having first program instruction means for instructing the computer to down-sample an alpha-map signal, which represents a shape of an object and a position in a frame of the object, at a down-sampling ratio based on size conversion ratio information, for obtaining a down-sampled alpha-map signal;second program instruction means for instructing the computer to up-sample the alpha-map signal at an up-sampling ratio based on size conversion ratio information given to restore the down-sampled alpha-map signal to an original size, and output a local decoded alpha-map signal;third program instruction 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;fourth program instruction means for instructing the computer to down-sample the motion compensation signal at the down-sampling ratio, for obtaining a down-sampled estimation/compensation signal;fifth program instruction means for instructing the computer to encode the alpha-map signal down-sampled by said first down-sampling means to a binary image in accordance with the down-sampled motion estimation/compensation signal, and outputting an encoded binary image signal; andsixth program instruction means for instructing the computer to multiplex and output the encoded binary image signal and the size conversion ratio information.