| 摘要 |
A computer-readable medium having stored thereon an image decoding program which, when executed by a computer, performs 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, 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.
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