Patent ID: 7248633
Filing Date: 2007-07-24
Classification: H04N

Abstract:
1. An image decoding apparatus for decoding dynamic image coded data coded by a coding system for dividing a frame into plural blocks and performing motion prediction coding of each block, the apparatus comprising: motion compensation means for, when the motion prediction-coded block is a decoding target block, specifying a reference area in a decoded frame using motion prediction information included in the image coded data and performing motion compensation of the decoding target block using information of the specified reference area; and error map table holding means for holding an error map table with respect to the decoded frame to be referred to when performing the motion compensation; wherein an error block existing in the decoded frame is shown in the error map table, and when the error map table is referred to and an error block is found to be included in the block included in the reference area, or when the dynamic image coded data of the decoding target block is broken, the motion compensation means performs error conceal processing to interpolate a pixel in the decoding target block with a pixel of the decoded frame and output the resulting data, then generates an error map table showing the error-concealed block as an error block, and stores the error map table into the error map table holding means; wherein the reference area is an arbitrary area within a reference frame to be referred to when performing the motion compensation and a position of said reference area is specified by a motion vector with respect to the decoding target block.