OBJECT DISTANCE MEASURING BY A SERIES OF IMAGES OBTAINED FROM DIFFERENT SHOOTING POINTS WITH A LOW-ANGLE CAMERA
V. P. Kosykh, G. I. Gromilin, N. S. Yakovenko
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: distance measurement, low-angle camera, conjugate points, triangulation, camera calibration, panorama
Abstract
When solving various applied problems, it becomes necessary to reconstruct a three-dimensional scene and determine distances to objects from images obtained by cameras from different shooting points. Determining the shooting parameters and camera characteristics (calibration of the recording system) directly from the received images is an important stage of reconstruction, which determines the reliability of the results obtained. The need to use cameras with a small field of view leads to significant errors in calibration and reconstruction. The paper discusses a way to increase the accuracy of calibration by expanding the angle of view by "stitching" a series of images obtained from one shooting point into a wide-angle panorama. In addition to objects of interest, the panorama must include other shooting points. An example of estimating the distances to objects in a real urban scene is given. It is shown that the proposed method provides accuracy comparable to measuring distances on a large-scale map.
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