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Shape measurement by use of liquid-crystal display fringe projection with two-step phase shifting

机译:使用带有两步相移的液晶显示条纹投影进行形状测量

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摘要

The use of an optical fringe projection method with two-step phase shifting for three-dimensional (3-D) shape measurement of small objects is described. In this method, sinusoidal linear fringes are projected onto an object's surface by a programmable liquid-crystal display (LCD) projector and a long-working-distance microscope (LWDM). The image of the fringe pattern is captured by another LWDM and a CCD camera and processed by a phase-shifting technique. Usually a minimum of three phase-shifted fringe patterns is necessary for extraction of the object shape. In this method, a new algorithm based on a two-step phase-shifting technique produces the 3-D object shape. Unlike in the conventional method, phase unwrapping is performed directly by use of an arccosine function without the need for a wrapped phase map. Hence, shape measurement can be speeded up greatly with this approach. A small coin is evaluated to demonstrate the validity of the proposed measurement method, and the experimental results are compared with those of the four-step phase-shifting method and the conventional mechanical stylus method. (C) 2003 Optical Society of America. [References: 16]
机译:描述了具有两步相移的光学条纹投影方法在小物体的三维(3-D)形状测量中的使用。在这种方法中,正弦线性条纹通过可编程液晶显示器(LCD)投影仪和长距离显微镜(LWDM)投射到物体表面。条纹图案的图像由另一个LWDM和CCD相机捕获,并通过相移技术进行处理。通常,至少需要三个相移条纹图案才能提取物体形状。在这种方法中,基于两步相移技术的新算法产生了3D对象形状。与传统方法不同,相位解缠是通过使用反余弦函数直接执行的,不需要包裹的相位图。因此,使用这种方法可以大大加快形状测量的速度。对一枚小硬币进行了评估,以证明所提出的测量方法的有效性,并将实验结果与四步相移法和传统的机械笔法进行了比较。 (C)2003年美国眼镜学会。 [参考:16]

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