Ghost image debugging on a 240-degree fisheye lens

Thomas Weigel; Bob Moll; Bart J. Beers

doi:10.1117/12.246708

23 August 1996 Ghost image debugging on a 240-degree fisheye lens

Thomas Weigel, Bob Moll, Bart J. Beers

Proceedings Volume 2774, Design and Engineering of Optical Systems; (1996) https://doi.org/10.1117/12.246708
Event: Optical Instrumentation and Systems Design, 1996, Glasgow, United Kingdom

Abstract

For cartography applications Frank Data R&D developed a new concept for taking measurements which consists in obtaining panoramic photographs, which are later scanned into a computer. The computer then processes consequent pictures from different locations and creates 3D images of the landscape. An extremely wide angle Fisheye Lens is part of this concept. Delft Instruments has designed and manufactured this lens. The specifications and design drivers are discussed. Under extreme sun illumination conditions ghost images may occur, which will be presented with photographs. Not all of these effects could be traced by experiments. The trace was then continued by computer simulation based on the ASAP software. A method of debugging such a lens is presented. A Fisheye Lens is characterized by a small entrance pupil, compared with the size of the first lens, at a field-depending position. Together with the number of 18 optical surfaces in this case and the large field of view, a tremendous amount of ray tracing was necessary to find out the surfaces and the conditions that lead to the ghost images. Although a powerful workstation was used, an efficient strategy was necessary to isolate the main contributing paths and to visualize them.

Citation Download Citation

Thomas Weigel, Bob Moll, and Bart J. Beers "Ghost image debugging on a 240-degree fisheye lens", Proc. SPIE 2774, Design and Engineering of Optical Systems, (23 August 1996); https://doi.org/10.1117/12.246708

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