Patent ID: 6198768
Filing Date: 2001-03-06
Classification: H04N

Abstract:
An alpha-map decoding apparatus comprising:a demultiplexer for demultiplexing an alpha-map code and a size conversion ratio information code from an encoded alpha-map signal;a binary image decoder for decoding the alpha-map code to a binary image;an up-sampling circuit for up-sampling the binary image as the alpha-map code output from said binary image decoder in accordance with the size conversion ratio information code, and outputting the up-sampled image as a decoded video signal;a motion compensation circuit for generating a motion compensation signal on the basis of a previous decoded video signal and a motion vector signal; anda down-sampling circuit for down-sampling the motion compensation signal in accordance with the size conversion ratio information, and outputting the down-sampled motion compensation signal to said binary image decoder,wherein said binary image decoder decodes the alpha-map code in accordance with the motion estimation/compensation signal and the size conversion ratio information.