| 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 previously decoded reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method, the bilinear interpolation using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame, wherein the rounding method information specifies one of two values specifying a positive or a negative rounding method; wherein the rounding method information consists of one bit; 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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