Vision Measurement Technology Issues Related To Research And Practice

With the development of modern surveying technology, Computer vision technology and image processing technology have been introduced into surveying system, and form the particular field of surveying system, which will resolve some surveying problems in a better way. Base on the study of some relative problems about vision surveying system, a vision surveying system which based on video total station has been exploited. The system has been used in wood measuring and gains good effects. The most work in this paper are listed as follows:1. Analyze the method of stereo vision, and discuss the distribution of control points and characters of photography mode.2. Discuss the methods of digital camera's calibration. First the camera's imaging mode and error mode are analyzed. Considering its characters, a method considering the pixel scale factor to calibrate ordinary digital camera is put forward. Base this method, a improved way was discussed, and the test proves its correction and briefness.3. Analyze the methods of image's pretreatment and image's segmentation.4. Study two methods of characteristic picking .And base that the relative way of image matching are also studied. Above all, a method of image matching is put forward using the method of coded target.5. Analyze the examination method of video total station's parameters .And its two working mode is also discussed.6. Exploit a vision surveying system which based on 3-D video total station primarily. Experiment in wood measure shows that this its effective.