Study On The Key Technologies Of Optical Coordinate Measuring System And Software Design

Utilizing the technology of digital Close Range Photogrammetry (CRP), we can get the 3D information of the object whose CRP images were obtained in 100 meters using the technologies of image processing. The Opitical Coordinate Measuring System studied in this paper is based upon the digital 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. After analyzing the system working flow, we have designed and developed the software system base on database and three-dimensional CAD model.The main works of this paper are summarized as follows:1. Introduce the development and actuality of CRP technology and Optical Coordinate Measuring System.2. Study the calibration principle and center sub-pixel localization method. Introduce the direct calibration method and realize the iterative center sub-pixel localization method.3. After analyzing of software requirement and data structure, designed and developed the software system base on database.4. Redesign the measuring software and add the ACIS/HOOPS Software Development Kit to it. Then the software has graphics functions such as the 3D display, graphics report, etc.