| 摘要 |
<p>In a mode selecting section (1109), when a macroblock pair (hereinafter referred to as MBP) to be coded is coded in a frame structure by referencing a preceding frame in order of display time, for an adjacent MBP coded from a field structure, a mean value of the motion vectors of the macroblocks (hereinafter referred to as MB), i.e., the top and bottom fields of the MBP is applied, if both of the two MBs reference the frame whose first reference index is the minimum value. If there is an MB referencing a frame whose first reference index is not the minimum value, the motion vector is made “0”, thereby calculating the motion vector of the MB to be coded.</p> |
