Hadi Babapour; Ahmad Javaheri; Ali Mohammadpour
Volume 17, Issue 68 , February 2008, , Pages 41-44
Abstract
Given the existing sanctions on the use of new technologies in the field of photogrammetry and remote sensing, and given that the Geographic Organization has one of the most advanced digital cameras in the world, the importance of localization in the field of production and self-sufficiency is increasingly ...
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Given the existing sanctions on the use of new technologies in the field of photogrammetry and remote sensing, and given that the Geographic Organization has one of the most advanced digital cameras in the world, the importance of localization in the field of production and self-sufficiency is increasingly felt.
The installation of digital camera on a plane was one of the problems which, thankfully, was solved by the experts of the Geographic Organization. In the next step, the status parameters (translation and rotation parameters) of the digital camera should be determined relative to the two GPS and INS systems. Therefore, the first digital images were obtained by designing control points and appropriate flight paths over a test area.
Finally, the magnitude of rotation parameter (Bore Sight), magnitude of shift (GPS Drift) and also the effect of Self-Calibration equations in final results and the determination of the magnitude of extra parameters were determined.
Hamid Ma'soumi (Translator)
Volume 14, Issue 55 , November 2005, , Pages 48-50
Abstract
The evaluation of the geometric function of a large-scale digital camera (ULTRACAMD) is the main subject of this paper.The concepts of geometric calibration by bundle adjustment method have been described.The additional parameters based on the specific design of the camera are determined and defined, ...
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The evaluation of the geometric function of a large-scale digital camera (ULTRACAMD) is the main subject of this paper.The concepts of geometric calibration by bundle adjustment method have been described.The additional parameters based on the specific design of the camera are determined and defined, and the BINGO group modification software has been upgraded to manage these parameters.The entire calibration process will consist of four steps.In the first step, a set of images is taken from fully-clear targets such that additional observations (with high degree of freedom) are possible. The second step is to measure the coordinates of the image. Automation and accuracy are achieved by image processing techniques utilizing a special form of fully-clear targets.The third step involves processing the semi-automatic adjustment, and the unknown parameters (focal length, principal point coordinates, distortion parameters and additional parameters) are estimated. In the fourth step, we will identify the linear and non-linear parameters. Linear parameters are used to reduce the linear effects of distortion in the camera. This will be achieved by linear transmission of measured coordinates, so that only nonlinear small effects will remain. The remaining effects are then described in a table (Look Up table). The results of a series of full calibration operations, modified parameters and the effects of these parameters were presented. Finally calibration has been confirmed and implemented.