摘要 |
Image decoding method including: receiving an encoded bitstream including information of I and P frames, and executing motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and a reference image which is a previously decoded image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation being performable using a positive and negative rounding method; wherein the bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of a P current frame; wherein the rounding method information specifies one of two values specifying a positive rounding method or a negative rounding method; and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.
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