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UDC 004.932.4

PROJECTIVE DISTORTION CORRECTION ALGORITHM AT LOW ALTITUDE PHOTO/VIDEO SHOOTING ON THE DATA FROM INCLINOMETER AND RANGE METER

V. A. Maksimov, master student, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
I. S. Kholopov, PhD (technical sciences), assistant professor, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.

The article deals with the correction (form recovery and true mutual disposition of objects) algorithm of projective image distortion at low altitude photo/video shooting, based on a mathematical model of virtual camera. The aim of the work is a comparative analysis of given algorithm with correction algorithm based on finding corresponding points (vertices of n-gon, describing object contour). Correction quality criteria – maximum absolute value of difference between the angles of n-gon in the images without projective distortions and after the correction is introduced. Experimental results with calibrated web-camera Logitech C270 showed that having relative error of distance estimation to shooting surface, as well as camera pitch and roll not more than 5% then correction algorithm with virtual camera provides absolute error of reduced object
form not more than 3°.

Keywords: low-altitude photo / video shooting, projective distortion correction, homography matrix, object contour, vanishing points, camera calibration, MEMS accelerometer.

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