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首页> 外文会议>International conference on mechatronics technology >Simple and Flexible Calibration Method of a 3D Imaging System Based on Fringe Projection Technique
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Simple and Flexible Calibration Method of a 3D Imaging System Based on Fringe Projection Technique

机译：基于边缘投影技术的3D成像系统简单灵活的标定方法

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摘要

Phase calculation-based 3D imaging systems have been widely studied in academia and applied in industrial fields.A vital step of such 3D systems is calibration,which builds up the relationship between an absolute phase map and shape data.The existing calibration methods are complicated because of using a precise translating stage or a 3D gauge block.This paper presents a simple and flexible calibration method of phase calculation-based 3D imaging systems by using a checkerboard with known checker size and a white plate having discrete markers on the surface with known distance in between.Placing the checkerboard at several positions determines the internal parameters of the CCD camera of 3D imaging systems.The plate gives phase and depth data in the measuring volume to build up their relationship by a polynomial function at each pixel position.At each plate position,the absolute phase of each pixel can be calculated by projecting three fringe pattern sets with the optimum fringe numbers onto the plate surface.In the meanwhile,each marker position of the plate can be determined by an automatic extraction algorithm,so the relative depth of each pixel to a chosen reference plane can be obtained.Therefore,coefficient set of the polynomial function at each pixel are calculated by using the obtained multiple absolute phase and depth data.The X,Y coordinates and the pixel positions can be established by the parameters of the CCD camera and the calibrated depth data.Experimental results and performance evaluations show that the proposed calibration method can easily build up the relationship between absolute phase map and shape data in a simple and flexible way.
机译：基于相位计算的3D成像系统已在学术界得到了广泛的研究，并在工业领域得到了应用。此类3D系统的关键步骤是校准，它建立了绝对相位图和形状数据之间的关系。现有的校准方法很复杂，因为本文提出了一种简单而灵活的基于相位计算的3D成像系统的校准方法，该方法是使用已知棋盘格的棋盘和在已知距离的表面上具有离散标记的白板在两个位置之间放置棋盘可确定3D成像系统CCD相机的内部参数。该板在测量体积中提供相位和深度数据，以每个像素位置处的多项式函数建立它们之间的关系。位置，可以通过投影具有最佳条纹数的三个条纹图案集来计算每个像素的绝对相位同时，可以通过自动提取算法确定板的每个标记位置，因此可以获得每个像素相对于所选参考平面的相对深度。因此，多项式函数的系数集为通过使用获得的多个绝对相位和深度数据来计算每个像素。可以通过CCD摄像机的参数和校准后的深度数据来确定X，Y坐标和像素位置。实验结果和性能评估表明，提出的校准方法该方法可以轻松，灵活地建立绝对相位图和形状数据之间的关系。

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