Patent ID: 7151799

Claim:
A transcoder for coded video, which performs transcoding an encoding mode, and outputting, comprising: a coded data extractor that partially decodes coded information of compressed video data and extracts it; an approximate image generator that generates an approximate image from the coded information that has been extracted; a first motion vector detector that performs detection of motion vector candidates from the approximate image; a decoder that decodes the coded information and generates a luminance signal and a chrominance signal; a second motion vector detector that performs detection of a motion vector on the basis of the luminance signal that has been produced in the decoder and the motion vector candidates that have been detected in the first motion vector detector; and a re-encoder that performs re-encoding of the data on the basis of the motion vector information that has been detected in the second motion vector detector, the luminance signal that has been decoded in the decoder, and the chrominance signal the data format of that has been transcoded.