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An improved calibration method for structured light projection measurement system

机译：一种结构光投射测量系统的改进标定方法

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摘要

The accurate calibration for a 3D profile measurement system based on structured light projection is important to the precision measurement system; however, system calibration is always complicated and time-consuming. An improved fast method is proposed to calibrate the measurement system. First, LCD monitor, as a calibration plate, displays chessboard pattern designed by computer programming, and camera captures 1 image. Then LCD monitor displays white pattern, projector projects horizontal and vertical color-encoded fringes to the LCD monitor, and camera collects 2 images respectively. A Phase-shifting algorithm is used to establish a highly accurate correspondent relationship between camera pixels and projector pixels, and projector images are generated. Next, move the LCD monitor to other 8 places, get camera and projector images which are set for camera and projector calibration respectively using Zhang's calibration method. Compared with ordinary techniques which use expensive equipments such as two or three orthogonal plates, LCD monitor is easy-to-use and flexible, and experiments show that calibration accuracy is improved by 5 times. In comparison with traditional projector calibration method, this method decreases the number of captured images from 8 to 2 in each place and increases the processing speed. Combining camera calibration and projector calibration, the complex calculation process of integrating traditional camera calibration and projector calibration can be simplified. Experiments have been performed based on the proposed technique and good results have been obtained.
机译：基于结构化光投影的3D轮廓测量系统的精确校准对于精确测量系统很重要；但是，系统校准始终是复杂且耗时的。提出了一种改进的快速校准系统的方法。首先，LCD监视器作为校准板，显示通过计算机编程设计的棋盘图案，然后照相机捕获1张图像。然后，LCD监视器显示白色图案，投影机将水平和垂直颜色编码的条纹投射到LCD监视器上，并且照相机分别收集2张图像。使用相移算法来建立相机像素和投影仪像素之间的高精度对应关系，并生成投影仪图像。接下来，将LCD监视器移至其他8个位置，获取分别使用Zhang的校准方法设置用于相机和投影仪校准的相机和投影仪图像。与使用昂贵的设备（例如两个或三个正交板）的普通技术相比，LCD监视器易于使用且具有灵活性，并且实验表明，校准精度提高了5倍。与传统的投影仪校准方法相比，该方法将每个位置的捕获图像数量从8个减少到2个，并提高了处理速度。将相机校准和投影仪校准相结合，可以简化将传统相机校准和投影仪校准相集成的复杂计算过程。基于提出的技术进行了实验，并获得了良好的结果。

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