提取主体的目的是防止背景干扰定向,而是否提取主体的判断依据在于物体与背景的相对位置是否发生变化。如果物体不动,而人动,就不需要提取主体;如果是物体动(比如放在转盘上拍照),而人不动,就需要提取主体。
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