METHOD FOR DETECTING AND LOCALIZING TRANSMISSION ERROR IN MOVING PICTURE COMPRESSING SYSTEM

摘要

PURPOSE: A method for detecting and localizing a transmission error in a moving picture compressing system is provided to inflict limitation on a position having possibility of motion displacement, so as to effectively detect the transmission error and localize a position of the error. CONSTITUTION: An integer-pel motion estimator(100) estimates motion displacement by the unit of integer-pel of an initial frame or a reference frame. A half-pel motion estimator(120) estimates motion displacement by the unit of half-pel. An SAD(Sum of Absolute Difference) storage unit(140) stores current SAD values respectively detected from the integer-pel motion estimator and the half-pel motion estimator. A motion displacement update unit(160) updates the detected motion displacement. And a motion displacement limiting unit(180) inflicts limitation on a position for the motion displacement. For the motion estimation, a point having a minimum SAD value is selected as final motion displacement in 9 search points of the half-pel unit centered on a currently searched pel.