METHOD FOR ENCODING MOVING PICTURE WITH REDUCING AMOUNT OF DCT CALCULATION AND APPARATUS THEREOF

摘要

PURPOSE: A method for encoding a moving picture with reducing an amount of DCT calculation and an apparatus thereof are provided to obtain the existing SAD information without increasing the amount of DCT calculation, and selectively apply a DCT calculation method based on the SAD information. CONSTITUTION: A DCT(Discrete Cosine Transform)(210) transforms an error signal between a current video signal and an estimated video signal according to a range of an SAD(Sum of Absolute Difference). A motion estimator(260) divides an error signal between a previous video signal and the current video signal according to signs and adds each absolute sum for generating the SAD value. A mode control unit(270) compares the SAD value with a threshold for controlling the complexity of DCT operation.