文章基本信息

标题：A PROGRAM FOR AUTOMATIC INNER ORIENTATION OF DIGITIZED NON METRIC IMAGES (35 AND 70 mm)
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作者：Santiago CRUZ ; Javier CARDENAL ; Jorge DELGADO 等
期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2000
卷号：XXXIII Part B5/1
页码：149-156
出版社：Copernicus Publications
摘要：A program for the automatic inner orientation of non-metric digitized images taken with 35 and 70 mm cameras has been implemented under I.D.L. 5.0 (Interactive Data Language, release 5.0 from Research System Inc.). The program is based in the detection of the four edges that define the frame format. The approach to detect the edges uses Prewitt filters that can detect horizontal (both lower and upper) and vertical (both right and left) lines. Once edges have been detected, they are measured by means of transverse profiles throughout the detected edges. A regression fit line is computed each edge. However it is necessary blunder detection and elimination of anomalous data or noise. Then lines are computed again without blunders and the frame corners are calculated by intersection of lines. The photo-coordinate system is referenced to the center of the format (the indicated principal point defined by intersection of diagonals) and the X-axis is forced to be parallel to the lower format edge. Moreover there is a possibility for coordinate transformations (4-parameters, 6-parameters, two-dimensional projective or 8-parameters bilinear) if fixed reference values exist for those corners, so some film or scanner errors can be corrected. The program runs with digitized images in grey scale or RGB TIFF files. Images have to be scanned without any cropping because the whole format is necessary for the inner orientation (edges must be clearly visible and contrasted). Non-Metric cameras and desktop scanners, equipped with transparency trays, combined with this method can be an effective option for low cost photogrammetric applications
关键词：Photogrammetry; Software; Semi-automation; Inner orientation; Image processing; Non-Metric ; cameras