Natural light, scattering light and diffracted ray are removed effectively with those methods. Then, laser spot keeps stable, system precision is improved and an ideal result is obtained.

这些预处理方法有效地消除了自然光线、散射光线和衍射光线对系统的干扰，使激光光斑图像保持稳定，起到提高系统精度的作用，得到了较为理想的结果。

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Natural light, scattering light and diffracted ray are removed effectively with those methods. Then, laser spot keeps stable, system precision is improved and an ideal result is obtained.

这些预处理方法有效地消除了自然光线、散射光线和衍射光线对系统的干扰，使激光光斑图像保持稳定，起到提高系统精度的作用，得到了较为理想的结果。

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