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Proceedings Paper

Ultrafast camera for motion recognition by tomographic techniques
Author(s): Luca Poletto; Alessandro Dalla Lana; Ruggero Frezza; Nicola Moretto; Giampiero Naletto; Giuseppe Tondello
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Paper Abstract

A camera for ultra-fast motion measurement based on tomographic techniques is presented. The motion analysis is performed by following the movements of several discrete points (light emitting sources) positioned on the object. The camera utilizes three linear detectors, and the optical system is designed so that the measurements on the linear detectors are projections of the two-dimensional image. Using a suitable reconstructing algorithm based on discrete tomographic techniques, the position of the original point sources on the virtual two-dimensional image is determined. The remaining ambiguity of the tomographic reconstruction is minimized by assuming a model for the intensity of the point sources and adopting a normalization algorithm. The realization of this principle requires a rather sophisticated optical system to realize the one-dimension projection of the whole field of view without introducing significant aberrations, and three such optical systems in parallel are necessary to realize the tomographic reconstruction. In addition, these optical systems have to guarantee some depth of focus to allow reconstruction of movements also along the line of sight. Here we present the design of a camera based on this principle that can be operated at frame rates up to 40 KHz; it has a 30° field-of-view diameter and focuses objects at 2 m distance with spatial resolution of about 1.5 mm over a 1.1 m depth of focus length.

Paper Details

Date Published: 6 February 2004
PDF: 11 pages
Proc. SPIE 5210, Ultrahigh- and High-Speed Photography, Photonics, and Videography, (6 February 2004); doi: 10.1117/12.520811
Show Author Affiliations
Luca Poletto, INFM (Italy)
Univ. degli Studi di Padova (Italy)
Alessandro Dalla Lana, INFM (Italy)
Univ. degli Studi di Padova (Italy)
Ruggero Frezza, Univ. degli Studi di Padova (Italy)
Nicola Moretto, Univ. degli Studi di Padova (Italy)
Giampiero Naletto, INFM (Italy)
Univ. degli Studi di Padova (Italy)
Giuseppe Tondello, INFM (Italy)
Univ. degli Studi di Padova (Italy)

Published in SPIE Proceedings Vol. 5210:
Ultrahigh- and High-Speed Photography, Photonics, and Videography
Donald R. Snyder, Editor(s)

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