To provide a moving image decoder capable of accurately calculating a motion vector of a color difference component from a motion vector of a luminance component in inter-screen prediction decoding, when decoding a code string made by encoding an inputted interlaced moving image, making one field one picture.
A moving image decoder 200 is capable of calculating an accurate motion vector by correcting on the basis of color difference sample position information, when calculating a motion vector of a color difference component from a motion vector of a luminance component in inter-screen prediction decoding by acquiring the color difference sample position information which shows in what positional relationship a sample position of the color difference component of a picture to be decoded is in relation to a sample position of the luminance component, in a color difference sample position information analysis unit 206.
KIMURA KAZUHITO
OKOSE HIDEYUKI
ARAKAWA HIROSHI
ARIMURA KOJI
Daisuke Nagano
Kentaro Fujii
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