期刊名称：Archiwum Fotogrametrii, Kartografii i Teledetekcji
印刷版ISSN：2083-2214
出版年度：2007
卷号：17
语种：English
出版社：Main Board of Association of Polish Surveyors
摘要：The application of digital cameras for surveying purposes has become very popular in the recent decade. In order to adapt a digital camera to photogrammetric tasks,an accurate calibration is essential. A large number of photogrammetric research institutes have special test-fields projected for those purposes. The Faculty of Mining Surveying and Environmental Engineering at AGH University of Science and Technology has a test-field composed of 159 ring targets. These targets have to be measured,during the calibration process,on at least several photos,which takes a long time. With the view to make this procedure less time-consuming,a program,which carries out an automatic measurement on digital test-field images,has been created. This program detects the targets,determines their centers and performs automatic identification. In order to cerate it,the MATLAB v 7.0 software was used,especially Image Processing Toolbox. The use of morphological operations,image thresholding,radiometric similarity segmentation and region filtering was made. To assign the numbers to the images of the targets the special stripe codes were designed. The algorithm for decoding and identification of the test-field uncoded targets was also created. It uses the projective transformation of the image plane to the test-field plane. A set of experiments was conducted including determination of the successfulness of codes reading on unsharp images. Their results seem to confirm the great usefulness of the program in practice.
其他摘要：W ciągu ostatniego dziesięciolecia powszechne stało się stosowanie cyfrowych aparatów fotograficznych do pomiarów fotogrametrycznych. Najczęściej wykorzystuje się obrazy z kamer o wyznaczonych parametrach rzutowania. W tym celu wykonuje się ich kalibrację
