Patent ID: 8306338

Claim:
A moving-picture coding device that performs inter-field motion compensation prediction in response to a moving-picture signal comprised of a plurality of fields, the moving-picture coding device comprising: a coding target picture limit area determining unit to determine a coding target picture limit area putting a limit to a vector used to code target pictures; a reference limit area determining unit to select, for each reference picture with respect to one or plurality of reference pictures used to code, a luminance reference limit area putting a limit to a reference picture used to generate a prediction picture having a luminance of a coding block belonging to the coding target picture limit area and a chrominance reference limit area putting a limit to the reference picture used to generate the prediction picture having a chrominance of the coding block belonging to the coding target picture limit area from the coding target picture limit area where each reference picture is previously coded; a selecting inhibit vector determining unit to determine a selecting inhibit vector, when the coding block belongs to the coding target picture limit area, and control a motion vector of the chrominance generated from a motion vector of the luminance, the selecting inhibit vector inhibits selecting by a motion determination unit according to a position of the coding block, a parity of the coding block, and a parity of one of the reference pictures so that both prediction images of the luminance and the chrominance are comprised of only pixels of the luminance reference limit area and the chrominance reference limit area; and a motion vector determining unit that excludes the selecting inhibit vector to determine at least one motion vector when coding of the coding block is used in the coding target picture limit area, and the motion vector is used in coding of the target picture limit area.