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：2004
卷号：XXXV Part B5
页码：258-261
出版社：Copernicus Publications
摘要：This paper shows the use of digital photogrammetry for measurement of shrinkage in concrete sample (4x4x22 cm) during the hydra- tion process. A vision system consist of two digital video cameras was established to measure vertical displacement. The system was calibrated because of the cameras were designed for high accuracy measurement purposes. This was done by imaging a calibration object placed within the workplace. A least squares bundle adjustment determines the camera calibration parameters as well as the exterior orientation parameters of the cameras. Measurements were conducted at 2 epochs over 24 h. The estimated precision of the 3-D points positions is in the order of 0,1 mm, which is sufficient for this application. The resulting points can then be used for a de- formation analysis
关键词：Calibration; Close Range; Adjustment; Comparison; Analysis
