INVERSE DISCRETE COSINE TRANSFORM METHOD, INVERSE DISCRETE TRANSFORM APPARATUS, CODING APPARATUS FOR MOVING PICTURE, DECODING APPARATUS FOR MOVING PICTURE, INFORMATION RECORDING MEDIUM, AND TRANSMITTING APPARATUS

摘要

An inverse discrete cosine transform method comprising the steps of: determining a sum of plural input coefficients; judging whether the sum is even number or odd number, whereby when the sum is even number, an operation is implemented to at least one input coefficient to allow the sum to be odd number; and implementing inverse discrete cosine transform to the plural input coefficients which have undergone the operation.