Verfahren und Einrichtung zur Beseitigung von Kodier-/Dekodier-Verzerrungen von Bewegtbilddaten

摘要

In a moving-picture image signal processing system (1000) used in a so-called "video phone communication system", a coding/decoding distortion contained in a coded moving-picture image signal (2) is removed therefrom. The image signal processing system (1000) comprises a memory unit (90) for previously storing plural coefficients ( alpha , 1- alpha ) of variation amounts with respect to pixel values of coded input image data (2); a subtraction unit (4) for performing s subtraction between the pixel value of the coded input image data (2) and a pixel value of reference image data (5) to obtain a difference pixel value (d), the reference image data (5) being obtained from distortion-free image data acquired during one image-data processing cycle before a present image-data processing cycle for the coded image data (2); and, a distortion removing unit (10B ) for removing a coding/decoding distortion contained in the input image data (2) by processing the pixel value of the coded image data (2) based upon these coefficients ( alpha , 1- alpha ) read out from the memory unit (90) in response to the difference pixel value (d), whereby distortion-free input image data is produced. <IMAGE>