远心结构光三维系统研究

On the 3D Telecentric Structured Light Systems

结构光三维重建技术已广泛应用于工业检测领域,随着工业检测需求的不断提高,工业检测技术的需求也愈发向微小化和高精度化方向发展。其中,远心镜头具备透视误差小、镜头畸变小、成像失真少等优秀特性,获得越来越多的关注。该文投影仪采用传统镜头,将传统结构光系统中的相机镜头替换为远心镜头,通过对传统两步标定法的改进,对相机的仿射模型进行标定,随后用已标定的相机对投影仪进行参数标定。实验结果显示,所开发的远心结构光系统具备能够实现小视野范围的高精度、高分辨率三维重建,并具有加大的测量景深,可用于半导体器件及微型零部件等目标的高精度三维检测。

Structured light 3D reconstruction technology has been widely used in industrial detection.Nowadays,the more miniaturized and higher-precision industrial detection technology is becoming more important.The telecentric lens has many excellent characteristics,such as small perspective error,small lens distortion,less imaging distortion,and large depth of field,which attracts more attention.In this paper,the traditional lens is used to replace the camera lens in the traditional structured light system with the telecentric lens.Through the improvement of the traditional two-step calibration method,the affine model of the camera is calibrated,and then the calibrated camera is used to calibrate the parameters of the projector.The experimental results show that the telecentric structured light system can achieve high-precision and high-resolution 3D reconstruction in a small field of vision,and has an increased depth of field.It can be used for high-precision 3D detection of semiconductor devices and micro-components.