Research On Optimization Of Structural Parameters Of Binocular Vision System In Remote 3-D Coordinate Measurement

For the application environment with long distance,larger view filed and complete terrain,a 3D coordinate measurement system has been established based on binocular stereo vision.This paper introduced system calibration method,and analyzed the system structural parameters’ influence for the system measurement accuracy.By simulation,the paper make a conclusion on the principal of system structure parameters design,and it was verified by the outside experiments.The results showed that the system measurement accuracy satisfied the system design requirements.With the theory of binocular stereo vision,it has the characteristics of fast locate,accurate position,non-contact between locate system and target and so on.The process involves camera calibration,image acquisition,feature point match and 3D reconstruction.At present,the theory of binocular stereo vision has been greatly improved,but the design level of binocular stereo vision system has great influence on system measurement accuracy,thus,a suitable system structure will improve the measurement accuracy.This paper used the interchange vision structure,which is one of the common vision system,compared with parallel structure,it has characteristics with wide public view-field,and high measurement precision,and it is also suitable for the application environment.The main researches of this paper includes:1.The research on the project’s background and application requirements,introduced domestic and foreign research situation of automatic target system at present.2.The research on methods of the target location based on binocular stereo vision theory,and the structure parameters design of the binocular stereo vision system.3.Combined with the application background of the system,and based on the theory of binocular stereo vision,this paper established the measurement model and calibration method of the system.The calibration method is required to apply the environment of shooting range with long distance,complex terrain,and it is convenient for operation.In the simplified model,the method of measuring the translation vector and the method of extracting the coordinate of the feature point in the image were introduced.4.From the measurement model,the paper analyzed the factors that affect the accuracy of the system coordinate measurement.By simulation,the influence of the system layout,the GPS measurement accuracy and two horizontal attitude angle of cameras to the measurement errors were analyzed.According to the simulation results,the paper make a conclusion on how to design the system structure.5.By the experiments with several system layouts,the paper analyzed the system location precision,the results showed that the measurement accuracy of the system satisfied the design requirements,and also the principal of system structure design given in the paper have a guidance when construct the system,at the same time,it cut down the time of operation.6.Make a conclusion on the insufficient of this paper,and parts of the system needs to be improved.