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Proceedings Paper

LADAR scanner vertical distortion reduction via controlled signal modulation with a reconfigurable FPGA
Author(s): J. Thomas; D. Megherbi; P. Sliney
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Paper Abstract

In this paper, a method is discussed for reducing the vertical spatial distortion due to physical scanner characteristics. Unlike methods of spatial correction during acquisition, the distortion in this case can be noticeably reduced before it is ever even produced. Instead of spatial correction, this method can be thought of as distortion reduction. This method is advantageous because it can be applied before a given Ladar image acquisition phase. During the acquisition phase, error is introduced due to approximations, and noise among other things. If the distortion can be reduced before the acquisition phase occurs, a higher accuracy can be achieved. The method presented here is based on the way the vertical scanner is driven. We show that if the vertical scanner is driven with a square wave of the correct frequency, a much more uniform vertical scanning pattern can be realized. We also show that this can easily be incorporated into an FPGA-based laser scanner controller.

Paper Details

Date Published: 1 August 2005
PDF: 12 pages
Proc. SPIE 5873, Optical Scanning 2005, (1 August 2005); doi: 10.1117/12.624119
Show Author Affiliations
J. Thomas, Univ. of Massachusetts Lowell (United States)
D. Megherbi, Univ. of Massachusetts Lowell (United States)
P. Sliney, Univ. of Massachusetts Lowell (United States)

Published in SPIE Proceedings Vol. 5873:
Optical Scanning 2005
Stephen F. Sagan; Gerald F. Marshall, Editor(s)

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