Error analysis shows that the displacement measuring error entirely depends on geometric positioning precision of the first bar code center.
误差分析表明：位移测量误差完全取决于首条码中心几何定位。
Error analysis shows that the displacement measuring error entirely depends on geometric positioning precision of the first bar code center.
误差分析表明：位移测量误差完全取决于首条码中心几何定位。
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