交叉光轴的条纹投影测量系统仿真技术研究
发布时间：2018-11-18 10:30
【摘要】：条纹投影测量技术具有非接触、量程大、实时性强等优点而被广泛应用于大型曲面形状检测、文物保护、三维重构、工业检测、国防军事等。目前条纹投影测量系统的结构有很大的局限性,对一些测量要求比较严格的场合,其测量精度还有待提高。研究光投影测量仿真技术对优化系统结构和减小测量误差具有很好的推动作用,对研究三维物体表面对条纹的空间调制过程,解调方法、系统参数对测量的影响、评价测量算法的优劣、确定合理的技术方案和系统结构具有重要的意义。本文重点研究了投影机光轴和相机光轴没有交点的条纹投影测量仿真系统(交叉光轴投影测量仿真系统),分别对投影机光轴和参考平面不相互垂直的测量系统(倾斜投影测量系统)和投影机光轴与参考平面垂直的测量系统(垂直投影测量系统)进行了研究。本文的主要研究成果如下:1.提出了一种倾斜投影的交叉光轴投影测量仿真系统。新的仿真系统中投影仪的光轴和相机的光轴不需要相交于一点,通过坐标的平移和旋转求出物体表面和参考平面上的条纹相位值。新的仿真系统对阴影区域的判断方法进行了改进,在参考平面上阴影区域的判断运用迭代法,在物体表面上阴影区域的判断运用向量法,两种方法的结合既扩大了其适用范围,又提高了其计算速度。2.提出了一种垂直投影条纹的双目测量仿真系统。该仿真系统中投影仪的光轴和被测场景的参考平面相互垂直,而相机光轴和参考平面是相互倾斜的。这样的位置关系使该系统可以包含两个摄像机,一般对称放置,能够减小摄像头拍摄盲区,增加了投影测量系统的测量范围,提高了其测量的便利性。3.首次在条纹投影测量系统中加入了离焦仿真和畸变仿真。目前存在的仿真系统都是在理想的针孔模型下的仿真系统,为了使该仿真系统能够和真实的拍摄效果更加接近,根据镜头相机成像的原理,在仿真系统加入了离焦仿真的功能。根据镜头畸变的原因,在仿真系统中加入了畸变仿真的功能。
[Abstract]:Fringe projection measurement technology is widely used in large curved surface shape detection, cultural relic protection, 3D reconstruction, industrial detection, national defense and military, because of its advantages of non-contact, large measuring range and strong real-time. At present, the structure of fringe projection measurement system has great limitations. The research on the simulation technology of optical projection measurement has a good effect on optimizing the system structure and reducing the measurement error. It can also be used to study the spatial modulation process, demodulation method and the effect of system parameters on the measurement of the fringe on the 3D object surface. It is of great significance to evaluate the advantages and disadvantages of the measurement algorithm and to determine the reasonable technical scheme and system structure. This paper focuses on the fringe projection measurement simulation system (cross optical axis projection simulation system), which has no intersection point between the optical axis of the projector and the optical axis of the camera. The measurement system (tilt projection measurement system) in which the optical axis and the reference plane of the projector are not perpendicular to each other and the vertical measuring system of the optical axis and the reference plane of the projector (vertical projection measurement system) are studied respectively. The main research results of this paper are as follows: 1. An oblique projection simulation system for cross-axis projection measurement is proposed. In the new simulation system, the optical axis of the projector and the optical axis of the camera do not need to be intersected at one point. The phase values of the fringe on the object surface and the reference plane are obtained by the translation and rotation of the coordinates. The new simulation system improves the judgment method of shadow region. The iterative method is used to judge the shadow area on the reference plane, and the vector method is used to judge the shadow area on the object surface. The combination of the two methods not only expands the scope of its application, The speed of calculation is also improved. 2. A binocular measurement simulation system for vertical projection fringes is proposed. In this simulation system, the optical axis of the projector is perpendicular to the reference plane of the scene under test, while the camera optical axis and the reference plane are inclined to each other. This kind of position relation can make the system contain two cameras, which can be placed symmetrically, reduce the blind area of camera shooting, increase the measuring range of projection measurement system, and improve the convenience of measurement. Defocus simulation and distortion simulation are added to the fringe projection measurement system for the first time. The existing simulation systems are all simulation systems under the ideal pinhole model. In order to make the simulation system more close to the real shooting effect, the defocus simulation function is added to the simulation system according to the principle of camera imaging. According to the reason of lens distortion, the function of distortion simulation is added to the simulation system.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP391.9
本文编号：2339788
[Abstract]:Fringe projection measurement technology is widely used in large curved surface shape detection, cultural relic protection, 3D reconstruction, industrial detection, national defense and military, because of its advantages of non-contact, large measuring range and strong real-time. At present, the structure of fringe projection measurement system has great limitations. The research on the simulation technology of optical projection measurement has a good effect on optimizing the system structure and reducing the measurement error. It can also be used to study the spatial modulation process, demodulation method and the effect of system parameters on the measurement of the fringe on the 3D object surface. It is of great significance to evaluate the advantages and disadvantages of the measurement algorithm and to determine the reasonable technical scheme and system structure. This paper focuses on the fringe projection measurement simulation system (cross optical axis projection simulation system), which has no intersection point between the optical axis of the projector and the optical axis of the camera. The measurement system (tilt projection measurement system) in which the optical axis and the reference plane of the projector are not perpendicular to each other and the vertical measuring system of the optical axis and the reference plane of the projector (vertical projection measurement system) are studied respectively. The main research results of this paper are as follows: 1. An oblique projection simulation system for cross-axis projection measurement is proposed. In the new simulation system, the optical axis of the projector and the optical axis of the camera do not need to be intersected at one point. The phase values of the fringe on the object surface and the reference plane are obtained by the translation and rotation of the coordinates. The new simulation system improves the judgment method of shadow region. The iterative method is used to judge the shadow area on the reference plane, and the vector method is used to judge the shadow area on the object surface. The combination of the two methods not only expands the scope of its application, The speed of calculation is also improved. 2. A binocular measurement simulation system for vertical projection fringes is proposed. In this simulation system, the optical axis of the projector is perpendicular to the reference plane of the scene under test, while the camera optical axis and the reference plane are inclined to each other. This kind of position relation can make the system contain two cameras, which can be placed symmetrically, reduce the blind area of camera shooting, increase the measuring range of projection measurement system, and improve the convenience of measurement. Defocus simulation and distortion simulation are added to the fringe projection measurement system for the first time. The existing simulation systems are all simulation systems under the ideal pinhole model. In order to make the simulation system more close to the real shooting effect, the defocus simulation function is added to the simulation system according to the principle of camera imaging. According to the reason of lens distortion, the function of distortion simulation is added to the simulation system.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP391.9
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