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摘要:双N步相移轮廓术虽然可以大大降低由于光栅条纹的非正弦性所导致的相位误差，但增加了一倍的投影条纹数量，降低了测量效率。针对此问题，本文提出一种基于彩色编码光栅投影的双N步相移轮廓术，它将原相移条纹和附加相移条纹编码成双色条纹，融合到一幅彩色光栅条纹中投影，然后从采集的彩色条纹中提取两套条纹的相位信息，分别解包裹相位后，融合两包裹相位以减小相位误差。为验证所提方法的有效性，将该方法与两种典型的相位展开算法结合进行实验。实验结果证明，所提方法能有效降低相位误差，且不需要增加任何额外的光栅条纹，测量效率提高了46%。Abstract:Although double N-step phase-shifting profilometry can greatly reduce phase error caused by the non-sinusoidal nature of grating fringes, its number of the projection fringes doubles and its measurement efficiency is reduced. In this paper, a double N-step phase-shifting profilometry using color-encoded grating projection is proposed. It encodes the original phase-shifting fringes and the additional phase-shifting fringes into two colored fringes and fuses them into one color-encoded grating fringe projection. Then, the phase information of two sets of fringes is extracted from the captured color-encoded fringes. After calculating their wrapped phases, the two wrapped phases are fused to reduce phase error. In order to verify the effectivity of the proposed method, we combine the proposed method with two typical phase unwrapping algorithms to carry out experiments. The experimental results show that the proposed method can effectively reduce the phase error without adding any additional grating fringes and that its measurement efficiency is enhanced by 46%.
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图 3彩色光栅条纹的生成、投影、采集和GB分量提取
Figure 3.Generation, projection, capture and GB component extraction of color-encoded grating fringe
图 6相移法与枝切法结合解相位
Figure 6.Phase calculation by the combination of phase-shifting method and branch-cut method
图 8相移法与三频外差法结合解相位
Figure 8.Phase calculation by the combination of phase-shifting and three-frequency heterodyne method
表 1条纹数量
Table 1.The number of fringes
算法 双N步相移与枝切法解相位 双N步相移与三频外差法解相位 条纹颜色 灰度条纹 彩色条纹 灰度条纹 彩色条纹 条纹数量 8 4 24 12 
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