Decoder which switches output depending on whether input was field or frame encoded

摘要

An image signal decoder for decoding an input signal coded by a hybrid coding method comprising a field/frame processing detection section 302 for determining whether the input signal was coded in units of frames or fields, a motion compensation section 305 for performing motion compensation, a field interpolation section 307 for interpolating the output of the motion compensation section if the field/frame detection 302 section determines that the input signal was coded in units of fields and an output switching section 308 for outputting the output of the motion compensation section 305 when the field/frame detection section 302 determines that the input signal was encoded in units of frames and outputting the output of the interpolation section when the field/frame detection section determines 302 that the input signal was encoded in units of fields.