Uneven fringe projection for efficient calibration in high-resolution 3D shape metrology.
Uneven fringe projection for efficient calibration in high-resolution 3D shape metrology.
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DOI：
10.1364/ao.46.006113
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发表时间：
2007-08
期刊：
影响因子：
1.9
通讯作者：
Zonghua Zhang;C. Towers;D. Towers
中科院分区：
文献类型：
--
作者：
Zonghua Zhang;C. Towers;D. Towers
提出了一种新的非均匀条纹投影技术，即在数字视频投影仪上产生非均匀间隔的条纹，从而在测量体积中给出均匀间隔的条纹。该技术简化了测量相位与目标深度之间的关系，与像素位置无关。该方法只需要一个系数集即可进行标定和深度计算。在条纹投影不均匀的情况下，将形状数据参考到虚拟平面而不是物理参考平面，从而实现了不确定度较低的改进测量。此外，该方法还可以与径向透镜畸变模型相结合。提出了该方法的理论基础，并通过实验验证了非均匀条纹投影法相对于现有方法的优越性。英国国家物理实验室“步骤标准”的测量结果证实了采用所提出方法的测量不确定度。
A novel uneven fringe projection technique is presented whereby nonuniformly spaced fringes are generated at a digital video projector to give evenly spaced fringes in the measurement volume. The proposed technique simplifies the relation between the measured phase and the object's depth independent of pixel position. This method needs just one coefficient set for calibration and depth calculation. With uneven fringe projection the shape data are referenced to a virtual plane instead of a physical reference plane, so an improved measurement with lower uncertainty is achieved. Further, the method can be combined with a radial lens distortion model. The theoretical foundation of the method is presented and experimentally validated to demonstrate the advantages of the uneven fringe projection approach compared with existing methods. Measurement results on a National Physical Laboratory (UK) "step standard" confirm the measurement uncertainty using the proposed method.