9 November 2010 An aerial composite imaging method with multiple upright cameras based on axis-shift theory
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Abstract
Several composite camera systems were made for wide coverage by using 3 or 4 oblique cameras. A virtual projecting center and image was used for geometrical correction and mosaic with different projecting angles and different spatial resolutions caused by oblique cameras. An imaging method based axis-shift theory is proposed to acquire wide coverage images by several upright cameras. Four upright camera lenses have the same wide angle of view. The optic axis of lens is not on the center of CCD, and each CCD in each camera covers only one part of the whole focus plane. Oblique deformation caused by oblique camera would be avoided by this axis-shift imaging method. The principle and parameters are given and discussed. A prototype camera system is constructed by common DLSR (digital single lens reflex) cameras. The angle of view could exceed 80 degrees along the flight direction when the focal length is 24mm, and the ratio of base line to height could exceed 0.7 when longitudinal overlap is 60%. Some original and mosaic images captured by this prototype system in some ground and airborne experiments are given at last. Experimental results of image test show that the upright imaging method can effectively avoid the oblique deformation and meet the geometrical precision of image mosaic.
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Junyong Fang, Xue Liu, Yongqi Xue, Qingxi Tong, "An aerial composite imaging method with multiple upright cameras based on axis-shift theory", Proc. SPIE 7850, Optoelectronic Imaging and Multimedia Technology, 78500G (9 November 2010); doi: 10.1117/12.871389; https://doi.org/10.1117/12.871389
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