The Vx-series of interactive film scanners: film-based softcopy photogrammetry

Franz W. Leberl

doi:10.1117/12.2294282

1 August 1990 The Vx-series of interactive film scanners: film-based softcopy photogrammetry

Franz W. Leberl

Proceedings Volume 1395, Close-Range Photogrammetry Meets Machine Vision; 139513 (1990) https://doi.org/10.1117/12.2294282
Event: Close-Range Photogrammetry Meets Machine Vision, 1990, Zurich, Switzerland

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.

Citation Download Citation

Franz W. Leberl "The Vx-series of interactive film scanners: film-based softcopy photogrammetry", Proc. SPIE 1395, Close-Range Photogrammetry Meets Machine Vision, 139513 (1 August 1990); https://doi.org/10.1117/12.2294282

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