Image decoding method

摘要

A method of decoding images includes the steps of extracting motion vector information and quantized DCT coefficients from input information to be decoded, synthesizing a prediction image by performing motion compensation using the motion vector information and a reference image which is a previously decoded image, and synthesizing a decoded image by adding the prediction image to an error image obtained by applying dequantization and inverse DCT conversion to the quantized DCT coefficients. The motion compensation is performable using a positive rounding method and a negative rounding method for interpolating intensity values of pixels in performing the motion compensation.