| 摘要 |
In an image decoding method, an encoded bitstream including information of I and P frames is received, and motion compensation is performed by synthesising 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. Motion compensation includes calculating intensity values at points where no pixels actually exist in the reference image by bilinear interpolation, the bilinear interpolation being performed using a positive rounding method and a negative rounding method as specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame. The rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame. |
