Patent ID: 6393059
Filing Date: 2002-05-21
Classification: H04N

Abstract:
An apparatus for converting a first bit stream of moving picture that has been encoded by motion-compensated prediction to a second bit stream of moving picture motion-compensated at a block size different from that for the first bit stream, the apparatus comprising:a separator to separate a bit stream of first motion vector data from the first bit stream, the first motion vector data corresponding to a first block size; a decoder to decode a portion or all of the first bit stream by motion-compensated prediction at the first block size using the first motion vector data to obtain a decoded picture or a decoded signal at an intermediate processing stage; a forming unit to form a bit stream of second motion vector data using the first motion vector data by forming a plurality of second motion vectors for the second motion vector data by using one first motion vector for the first motion vector data, the second motion vector data corresponding to a second block size that is smaller than the first block size; an encoder to encode the decoded picture or the decoded signal by motion-compensated prediction at the second block size using the second motion vector data to obtain a third bit stream; and a multiplexer to multiplex the third bit stream and the bit stream of the second motion vector data to obtain the second bit stream.