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Gamma-distorted fringe image modeling and accurate gamma correction for fast phase measuring profilometry

机译:伽玛失真条纹图像建模和精确的伽玛校正,用于快速相位测量轮廓图

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摘要

In fast phase-measuring profilometry, phase error caused by gamma distortion is the dominant error source. Previous phase-error compensation or gamma correction methods require the projector to be focused for best performance. However, in practice, as digital projectors are built with large apertures, they cannot project ideal focused fringe images. In this Letter, a thorough theoretical model of the gamma-distorted fringe image is derived from an optical perspective, and a highly accurate and easy to implement gamma correction method is presented to reduce the obstinate phase error. With the proposed method, high measuring accuracy can be achieved with the conventional three-step phase-shifting algorithm. The validity of the technique is verified by experiments.
机译:在快速相位测量轮廓仪中,由伽马畸变引起的相位误差是主要的误差源。以前的相位误差补偿或伽马校正方法要求投影机聚焦才能获得最佳性能。但是,在实践中,由于数字投影仪具有大光圈,因此无法投影理想的聚焦条纹图像。在这封信中,从光学角度得出了伽玛畸变条纹图像的详尽理论模型,并提出了一种高度精确且易于实现的伽玛校正方法,以减少顽固的相位误差。利用所提出的方法,利用常规的三步相移算法可以实现高测量精度。通过实验验证了该技术的有效性。

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