单周期条纹双四步相移投影仪的标定方法

发布时间：2018-05-12 11:06

本文选题：光学测量 + 光栅投影　；参考：《光子学报》2017年01期

【摘要】：针对投影仪标定方法中存在畸变及倾斜投影引起条纹周期、条纹级数变化的问题,提出一种单周期条纹双四步相移投影仪的标定方法.设计生成横向和纵向各两组单周期条纹图像,经投影仪投影到带有圆形标识的标定板上,相机同步采集标定板图像,叠加由双四步相移获得的两幅相位主值图,对叠加相位主值图相位展开,利用展开的绝对相位值计算投影仪像素坐标值,最终将投影仪标定转换为成熟的相机标定.实验结果表明:仿真投影仪标定实验准确度的最大重投影误差约为0.4pixel,均方根误差为0.132 96pixel;实际投影仪标定实验准确度的最大反投影误差约为0.46pixel,均方根误差为0.143 12pixel;实验结果与仿真结果的最大反投影误差相差15%,均方根误差相差7.6%.与现有的采用三频相位展开进行投影仪标定的方法相比,投影光栅图像数可减少8幅.该方法改善了现有投影仪标定方法的不足,标定准确度和标定效率均得到提高.
[Abstract]:Aiming at the problem of fringe period and fringe series change caused by distortion and tilt projection in the calibration method of projector, this paper presents a calibration method of single-period fringe two-four-step phase shift projector. Two groups of horizontal and longitudinal single-cycle fringe images are designed and generated. The images are projected onto the calibration board with circular marks by projector. The camera synchronously collects the calibration board images and superimposes two principal phase maps obtained from the two-four-step phase shift. For the phase unwrapping of the superposition phase principal value map, the pixel coordinate value of the projector is calculated by using the expanded absolute phase value, and finally the projector calibration is converted into the mature camera calibration. The experimental results show that the maximum reprojection error is about 0.4 pixel, the root mean square error is 0.132 96 pixel, the maximum backprojection error is about 0.46 pixel and the root mean square error is 0.143 12 pixels. The maximum backprojection error between the test result and the simulation result is 15%, and the root mean square error is 7.6%. Compared with the existing three frequency phase unwrapping method for projector calibration, the number of projection grating images can be reduced by 8 pieces. This method improves the shortcomings of the existing projector calibration methods and improves the calibration accuracy and efficiency.
【作者单位】：河北工业大学机器人及自动化研究所;中国民航大学天津市民用航空器适航与维修重点实验室;
【基金】：国家自然科学基金委员会与中国民用航空局联合项目(No.U1433117) 中国民用航空局重大专项(MHRD20130104) 天津市民用航空器适航与维修重点实验室开放基金资助~~
【分类号】：TP391.41

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