Pulse-width modulation in defocused three-dimensional fringe projection
Pulse-width modulation in defocused three-dimensional fringe projection
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DOI：
10.1364/ol.35.003682
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发表时间：
2010-11-01
期刊：
影响因子：
3.6
通讯作者：
Ferrari, Jose A.
中科院分区：
文献类型：
--
作者：
Ayubi, Gaston A.;Ayubi, Jaime A.;Ferrari, Jose A.
用条纹投影法进行面形测量需要高质量的正弦条纹。我们提出了一种正弦条纹产生技术，利用轻微散焦二元条纹投影。所提出的方法是一个著名的脉冲宽度调制（PWM）技术的电气工程的空间版本。PWM很容易使用现成的投影仪实现，并且它允许我们克服伽马问题（即，非线性投影仪响应）。我们将证明，一个小的散焦水平低于文献中提出的其他技术，获得高品质的正弦图案。使用商业视频投影机的验证实验。(C)2010年美国光学学会
Shape measurements by fringe projection methods require high-quality sinusoidal fringes. We present a sinusoidal fringe generation technique that utilizes slightly defocused binary fringe projection. The proposed method is a spatial version of the well-known pulse-width modulation (PWM) technique of electrical engineering. PWM is easy to implement using off-the-shelf projectors, and it allows us to overcome the gamma problem (i.e., the nonlinear projector response) in the output light intensity. We will demonstrate that, with a small defocusing level-lower than with other techniques proposed in the literature-a high-quality sinusoidal pattern is obtained. Validation experiments using a commercial video projector are presented. (C) 2010 Optical Society of America