Study On The Precision Optimization And Error Compensation Of Optical Coordinate Measuring

The Opitical Coordinate Measuring System studied in this paper is based upon the digital Close Range Photogrammetry (CRP) technology. This measuring system is suitable for on-field large-scale measurement because of its wide measuring volume, high precision and great efficiency.From the requirement of on-field large-scale measurement, we analyze the development of CRP technology and study the key technologies such as camera's calibration, center sub-pixel localization. From the requirement of high-accuracy measuring, we select the high capability control point and add error compensation.The accuracy of the system has been highly enhanced.The main works of this paper are summarized as follows:1. Introduce the development and actuality of CRP technology and Optical Coordinate Measuring System. Study the calibration principle and center sub-pixel localization method. Introduce the direct calibration method and realize the iterative center sub-pixel localization method.2. Analyze the character of punctate lazer, and the precision of the system.Analyze the character of"dispersion film"and"absorbing paper", which can ehance the accuracy of the measuring.3. According to the theory and the experimentation data, we find the best size of the facula, which will be propitious to the accuracy of the system.Analyze the character of infrared LED, and the precision of the system.4. Study the error compensation, the result is satisfied.