Abstract
Abstract. The method for calibration of cameras equipped with long focal distance lens is researched in the present work. The basic idea is as follows. The camera to be calibrated is placed on the tripod with panoramic head. The main condition of panorama shooting is that the rotation center of the camera and the front nodal point of the lens should be the same. The camera is calibrated based on a series of images of a test object with a common center of projection. Special software has been created for this purpose. The results of experimental studies on digital simulated data and for a real camera Hasselblad H4D-60 are presented. Results of these experiments show that use of common projection center allow to increase accuracy of the calibration process of the long focal length cameras.
Highlights
The problem of calibration of cameras in this case is consists of the following
(Liang et al, 2014) propose a robust algorithm to calibrate the camera with a long focal length without using additional devices by adding a regularization term to computational process.(Robson et al, 2016) represents results of long focal length camera calibration in Violet and IR light
We suggest another approach to the calibration process
Summary
The problem of calibration of cameras in this case is consists of the following. If we try to calibrate long focus camera using ordinary test-object (Figure 1) we will note the significant degradation of precision of results or even the failure of calibration procedure may occur. It is due to bad geometrical conditions. A small number of points to be measured are in each photograph, very sharp intersection angle and insufficient depth (difference in position between far and near points) of the test-object (Figure 2). It is obvious that for long focal distance calibration the special test-object should be constructed. The first is to investigate means to better accommodate numerical ill-conditioning, and the second is to look to the formulation of the functional model. (Liang et al, 2014) propose a robust algorithm to calibrate the camera with a long focal length without using additional devices by adding a regularization term to computational process.(Robson et al, 2016) represents results of long focal length camera calibration in Violet and IR light
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