结构光深度获取系统校准方法

The Calibration Method for Structured Light Depth Acquisition System

针对基于相位调制的结构光用于深度获取时,投影系统、图像采集系统光瞳中心不等高而引入测量误差,提出一种测量系统校准方法。该方法以N帧正交光栅像与一立方体物体为辅助,根据光场中立方体边缘的阴影位置及其表面光栅栅线变形情况实现系统的粗校准;通过计算立方体深度在光场水平方向引起的相位变化量,指导系统的精校准。该方法可为基于结构光的深度获取装置校准提供理论指导,为非经验装调工作者提供技术支持,实验数据论证了该方法的有效性。

In the structured light depth acquisition system, a ：system calibration method is proposed to reduce the measurement error when the heights of the projector system and camera system＇s pupil centers are unequal. N frames orthogonal gratings and a cubic object are used to complete the calibration. Under the orthogonal light illumination, the shadow position of the cube and the grating line direction on the cube are served as references to complete the system coarse calibration. The phase modulated by the height of the cube in the horizontal direction is calculated tO guide the system delicate calibration. This method can provide theoretical foundation for the system calibration and technical assistance for the researchers without experience in depth acquisition process. EXperiment results demonstrate the effectiveness of the proposed method.