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首页> 外文期刊>Optics & Laser Technology >A fast reconstruction method for three-dimensional shape measurement using dual-frequency grating projection and phase-to-height lookup table
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A fast reconstruction method for three-dimensional shape measurement using dual-frequency grating projection and phase-to-height lookup table

机译：使用双频光栅投影和阶段高度查找表的三维形状测量快速重建方法

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摘要

Phase-to-height mapping is indispensable part of three-dimensional (3D) shape measurement system based on phase analysis, which guarantees the accuracy of 3D reconstruction. In this paper, a fast 3D shape reconstruction method based on dual-frequency grating projection and phase-to-height lookup table is proposed. In this proposed method, the reference plane is moved with known interval along the measurement depth direction to establish the mapping lookup table between the phase of the high and low frequency projected grating and their corresponding spatial height pixel by pixel respectively. Then, two methods to establish the lookup table with the unwrapped and the wrapped phase have been respectively introduced according to the characteristics of dual-frequency grating. The actual experimental results show that the two methods can effectively extend the measurement range of the current wrapped phase-to-height lookup method, and the reconstruction accuracy is better than the traditional phase-to-height quadratic fitting method. At the same time, the consumed time for 3D shape reconstruction of the tested object by the two methods is compared and analyzed. Finally, combining the high performance parallel computation of GPU, the fast 3D shape reconstruction is realized with the speed of 60fps.
机译：基于相位分析的三维（3D）形状测量系统是三维（3D）形状测量系统的不可或缺的一部分，保证了3D重建的精度。本文提出了一种基于双频光栅投影的快速3D形重构方法和基于阶段高度查找表。在该提出的方法中，参考平面沿着测量深度方向以已知的间隔移动，以分别通过像素的高频突出的光栅的相位和它们的相应的空间高度像素之间建立映射查找表。然后，根据双频光栅的特性，分别引入了两种与未包装和包裹阶段建立查找表的方法。实际的实验结果表明，这两种方法可以有效地延长电流包裹阶段到高度查找方法的测量范围，并且重建精度优于传统的相位高度二次配合方法。同时，比较和分析了通过两种方法进行测试对象的3D形状重建的消耗时间。最后，组合GPU的高性能并行计算，快速3D形重建以60fps的速度实现。

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