Department of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino, n.1, 56126 Pisa, Italy.
Sensors (Basel). 2013 Oct 14;13(10):13802-19. doi: 10.3390/s131013802.
Coded Structured Light techniques represent one of the most attractive research areas within the field of optical metrology. The coding procedures are typically based on projecting either a single pattern or a temporal sequence of patterns to provide 3D surface data. In this context, multi-slit or stripe colored patterns may be used with the aim of reducing the number of projected images. However, color imaging sensors require the use of calibration procedures to address crosstalk effects between different channels and to reduce the chromatic aberrations. In this paper, a Coded Structured Light system has been developed by integrating a color stripe projector and a monochrome camera. A discrete coding method, which combines spatial and temporal information, is generated by sequentially projecting and acquiring a small set of fringe patterns. The method allows the concurrent measurement of geometrical and chromatic data by exploiting the benefits of using a monochrome camera. The proposed methodology has been validated by measuring nominal primitive geometries and free-form shapes. The experimental results have been compared with those obtained by using a time-multiplexing gray code strategy.
编码结构光技术是光学计量领域中最具吸引力的研究领域之一。编码过程通常基于投影单个图案或图案的时间序列，以提供 3D 表面数据。在这种情况下，可以使用多狭缝或条纹彩色图案来减少投影图像的数量。然而，彩色成像传感器需要使用校准程序来解决不同通道之间的串扰效应，并减少色差。本文通过集成彩色条纹投影仪和单色相机开发了一种编码结构光系统。通过顺序投影和获取一小部分条纹图案，生成了一种结合空间和时间信息的离散编码方法。该方法通过利用使用单色相机的优势，允许同时测量几何和色度数据。所提出的方法通过测量标称原始几何形状和自由曲面形状进行了验证。实验结果与使用时分复用灰度码策略获得的结果进行了比较。
