Patent ID: 8509307

Claim:
An apparatus comprising: a decoder which decodes, using a generated chrominance motion vector, an encoded motion picture signal composed of a plurality of fields with an inter-field motion compensating prediction to thereby provide a decoded motion picture signal, wherein the decoder generates the chrominance motion vector from a luminance motion vector according to a calculation method represented by the formula: MVC y =MV y /2 when a reference source field and a reference destination field are both a top field or are both a bottom field, the formula: MVC y =MV y /2−0.25 when the reference source field is the top field and the reference destination field is the bottom field, and the formula: MVC y =MV y /2+0.25 when the reference source field is the bottom field and the reference destination field is the top field, wherein MV y implies a luminance motion vector indicating a vertical displacement of one luminance pixel of a field image by the value 1 of a vector component as units, MVC y implies a chrominance motion vector indicating a vertical displacement of one chrominance pixel of a field image by the value 1 of a vector component as units, and a motion vector is a vector that connects two corresponding pixels between a reference source field and a reference destination field.