Patent ID: 6259738
Filing Date: 2001-07-10
Classification: G06T,H04N

Abstract:
A computer system for video coding, comprising:first down-sampling means for down-sampling 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;up-sampling means for up-sampling the alpha-map signal at an up-sampling ratio based on size conversion ratio information given to restore the alpha-map signal down-sampled by said first down-sampling means to an original size, and outputting a local decoded alpha-map signal;motion compensation means for generating a motion compensation signal on the basis of a previous decoded video signal and a motion vector signal;second down-sampling means for down-sampling the motion compensation signal at the down-sampling ratio;encoding means for encoding the alpha-map signal down-sampled by said first down-sampling means to a binary image in accordance with the motion estimation/compensation signal down-sampled by said second down-sampling means, and outputting an encoded binary image signal; andmeans for multiplexing and outputting the encoded binary image signal and the size conversion ratio information.