HIGH EFFICIENCY DECODER FOR IMAGE SIGNAL AND ITS METHOD

摘要

PROBLEM TO BE SOLVED: To efficiency conduct field processing or frame processing even for an image with small motion or an image or the like with much motion. SOLUTION: A high efficiency decoder is provided with an inverse variable length coding circuit 51 that receives image coded data to be reproduced and header information, decodes them, and outputs motion prediction mode information denoting which of motion compensation in the unit of frame in a macro block and motion compensation in the unit of field is more efficient and outputs block processing mode information denoting which of block processing for orthogonal transform in the unit of frame of the macro block and for orthogonal transform in the unit of field of the macro block is more efficient and with a motion compensation circuit 59 or the like that conducts motion compensation inter-frame prediction or motion compensation inter-field prediction based on the detected motion vector, the motion prediction mode information and the block processing mode to output an image signal whose motion is compensated.