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A New Photogrammetric Inspection Method for National Flags with pentagrams

Journal of Geodesy and Geoinformation Science 2021年第4期4卷 34-45页

作者： Ting On CHAN Wei LANG Tingting CHEN Zhiquan LIU Qianying ZHAO Chuyao LIAO Lupan ZHANG School of Geography and Planning Sun Yat-sen UniversityGuangzhou 510275China China Regional Coordinated Development and Rural Construction Institute Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation School of Geography and PlanningSun Yat-sen UniversityGuangzhou 510275China

National flags are very important symbols of *** represent the countries’s authority and dignity of a ***,there are some occasions where the flags were produced incorrectly(or as frauds)but still hung officially without a formal *** this paper,we propose a photogrammetric inspection method for hanging national flags of China,for which only one single image is required to perform the *** proposed method allows automatic estimation of the relative positions and orientation of the pentagrams,so exposure of inappropriate flags can be identified *** method invokes a novel 2D geometric model of a pentagram(five-pointed star)to constrain an adjustment to estimate the camera’s exterior orientation parameters based on a single image of a statically hung *** error parameters such as the radial distortion parameters are integrated into the pentagram model to form a calibration process to reduce the 3D reconstruction *** the camera and the distortion parameters are estimated,the relative positions,orientations,and dimensions of all the five pentagrams can be readily computed with independent pentagram fitting so the flag quality can be verified using the national *** than 20 different hanging flags were captured to verify the proposed *** results indicate that the method is flexible and accurate,with an accuracy of 1.1mm for the position/dimension,and 0.2°for the orientation on *** the method is based on the proposed geometric model of the pentagram,it can be readily adapted to form another system to verify other countries’national flags containing more than one pentagram.

关键词： photogrammetry camera calibration pentagram flag inspection

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