| 摘要 |
A moving picture coding method and apparatus is provided that performs motion compensation interframe predictive coding, thus improving the compression efficiency. The magnitude of a forward motion vector, acquired through a forward motion vector search to a P-frame, is reduced in accordance with a frame distance between each B-frame and a reference frame (an I- or P-frame). The reduced forward motion vector is distributed as a forward motion vector to each of B-frames which undergoes bidirectionally motion compensation interframe predictive coding. Of B-frames, a B-frame following an I- or) P-frame is subjected to a backward motion vector search while the I- or P-frame is used as a reference frame. The magnitude of the resultant backward motion vector is reduced in accordance with a frame distance between each B-frame and the reference frame (I- or P-frame). The reduced vector is distributed as a backward motion vector. Bidirectionally motion compensation interframe predictive coding is performed using the forward motion vector and the backward motion vector.
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