Adaptive imaging system with spatial light modulator for robust shape measurement of partially specular objects.
Adaptive imaging system with spatial light modulator for robust shape measurement of partially specular objects.
复制标题
DOI：
10.1364/oe.18.027787
复制
发表时间：
2010-12
期刊：
影响因子：
3.8
通讯作者：
Joongki Jeong;M. Y. Kim
中科院分区：
文献类型：
--
作者：
Joongki Jeong;M. Y. Kim
在成像系统中，当使用成像光学器件将对变化的照明条件敏感地响应的镜面成像在CCD像素组上时，所获得的图像通常遭受像素饱和，从而导致拖尾或晕染现象。这些问题是严重的障碍时，应用结构光为基础的光学轮廓测量方法的一般物体的部分镜面的形状测量。因此，本文将相位型轮廓测量系统与自适应空间光调制器相结合，在成像部分实现了对物体三维形状的测量，并具有较高的动态范围。在CCD相机前面使用空间光调制器防止图像传感器饱和，因为像素透射率是通过监视输入图像并随时间和空间提供调制器反馈信号来控制的。当使用该系统时，由于投影条纹有效地成像在CCD上而没有任何像素饱和，根据对象的形状的相位信息可以正确地从非饱和图像中提取。详细说明了系统的结构和透射率控制方案，并通过一系列实验验证了系统的性能，成功地从饱和区提取了相位信息。基于结果，建议的形状测量系统显示出更先进的自适应动态范围相比，传统的系统。
In imaging systems, when specular surfaces responding sensitively to varying illumination conditions are imaged on groups of CCD pixels using imaging optics, the obtained image usually suffers from pixel saturation, resulting in smearing or blooming phenomena. These problems are then serious obstacles when applying structured light-based optical profiling methods to the shape measurement of general objects with partially specular surfaces. Therefore, this paper combines a phase-based profiling system with an with an adaptive spatial light modulator in the imaging part for measuring the three-dimensional shapes of objects with an advanced dynamic range. The use of a spatial light modulator in front of a CCD camera prevents the image sensor from being saturated, as the pixel transmittance is controlled by monitoring the input images and providing modulator feedback signals over time and space. When using the proposed system, since the projected fringes are effectively imaged on the CCD without any pixel saturation, phase information according to the object's shape can be correctly extracted from non-saturated images. The configuration of the proposed system and transmittance control scheme are explained in detail, plus the performance is verified through a series of experiments, in which phase information was successfully extracted from areas that are not normally measurable due to saturation. Based on the results, the proposed shape measurement system showed a more advanced adaptive dynamic range when compared with a conventional system.