| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve image coding efficiency. <P>SOLUTION: A forward motion vector, which is a motion vector for an image to be coded relative to a past reference image that temporally precedes, and a backward motion vector, which is a motion vector for an image to be coded relative to a future reference image that temporally follows, are detected, and a prediction mode is selected according to a magnitude relation of residual error Ef or Eb for predicted images which are each acquired in response to the forward motion vector or backward motion vector. In this case, a two-way prediction coding mode is designed to be selected only when the residual error Ef or Eb is a predetermined value or more, with the predetermined value being designed to be set in response to the forward motion vector or backward motion vector. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
