为了解决复杂环境中大视场、高精度、非接触3维测量问题，采用三目摄像机结构，通过靶标成像来测量被测点3维坐标的测量系统。测量时摄像机采集测量靶标的图像，计算机通过图像处理的方法获取测量靶标上标志点的3维坐标，并提出基于被测点与标志点间距离方程与直线约束的被测点求解优化方法。测量系统通过高精度光栅位移平台带动测量靶标移动来完成测试。结果表明，测量系统在视场范围、测量精度、使用灵活性等方面有较大的改进，能够测量视场深度从2m~5m范围内的视场，测量精度优于0.2mm。

In order to solve the problems of the large field of view,high-precision and non-contact 3-D measurement in the complex environment,a trinocular measuring system was put forward,in which the 3-D coordinates of the measured point were measured by analyzing target images. When under the measurement,the camera captured images of the measurement target,while the computer obtained the 3-D coordinates of the mark points in the measurement target by means of image processing,and an optimized method for solving the measured points was proposed based on the distance between the measured points and mark points,as well as linear constraint. The measurement target can be moved with the platform of the high precision grating ruler and measurement can be carried out. As shown in the experiment,the 3-D measurement system has a greater improvement in the field range,measurement accuracy,operation flexibility and so on. Its measurement accuracy is higher than 0.2mm in the depth of field ranging from 2m to 5m within the viewing field.