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Proceedings Paper

The Vx-series of interactive film scanners: film-based softcopy photogrammetry
Author(s): Franz W. Leberl
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Paper Abstract

Softcopy photogrammetry's advent is a product of current advances in computer workstation technology and the low cost of image processing boards. Photogrammetric high resolution sensing remains, however, the realm of classical film-based photography. For softcopy-based digital photogrammetry to succeed creative solutions are needed to convert film to pixel arrays. We describe a novel scanning concept that permits one to convert a full frame of metric photography into an array of 32,000 x 32,000 pixels, or it permits the interactive "grabbing" of windows of pixels with sub-pixel accuracy while supporting a software-controlled zoom range with minimum pixels of 811.m and maximum pixels of 170p.m. At the heart of the new concept is the so-called "invisible reseau". Implementation of this new concept is in the form of the VX-series of scanners. The concept is discussed, and performance characteristics of the VX-Scanner are subject to analysis. The issue of "optimal" scanning parameters in both geometry and radiometry is a concern. The benefits derived from an interactive zoom-based approach to scanning are being highlighted.

Paper Details

Date Published: 1 August 1990
PDF: 9 pages
Proc. SPIE 1395, Close-Range Photogrammetry Meets Machine Vision, 139513 (1 August 1990); doi: 10.1117/12.2294282
Show Author Affiliations
Franz W. Leberl, Vexcel Corp. (United States)

Published in SPIE Proceedings Vol. 1395:
Close-Range Photogrammetry Meets Machine Vision
Armin Gruen; Emmanuel P. Baltsavias, Editor(s)

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