多目标的空间三维位置测试方法研究

Research of multiple target three-dimensional position testing method

针对高速运动的小目标群空间坐标难以获得的问题,本论文提出了采用基于光场相机的数字重聚焦法来获取空间中小目标群的三维坐标参数,通过改变微透镜的位置,使得空间中的小目标可以重新聚焦于成像平面上从而形成一个清楚的像,根据图像坐标解算出目标群的空间坐标。分析了光场相机和数字重聚焦技术的原理,建立了测试小目标群的几何模型;利用数字重聚焦技术、图像处理技术研究了目标群的三维坐标位置的计算方法,并利用灰度值加权形心法对参数进行了误差分析。所提出的方法与摄像法对比表明,两种方法所测得的坐标数值平均差为0.15 m。

For the problem that the space coordinate of the small target group with high speed is difficult to obtain, this paper propose a digital refocusing method based on light-field camera to obtain three-dimensional coordinate parameters of small and medium target groups, The small target can be refocused on the imaging plane to form a clear image by chan- ging the position of the microloans, then the multiple target three-dimensional position should be obtained by the imaging position. The principle of the light field camera and digital refocusing technology is analyzed, establishing the geometric model of the small target group; the three-dimensional coordinate position calculation method of the target group is stud- ied by using the digital refocusing technology and image processing technology, the error of the parameter is analyzed by using the gray-valued weighted centered method. The comparison between the proposed method in this paper and the camera method shows that the average difference between the two methods is 0. 15 m.