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Proceedings Paper

Passive method for extracting multiple distance data in real time
Author(s): Jochen Schwab
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Paper Abstract

We will present an analog optical method for measurement of the distance to an object by using its stochastical structure. This is achieved by dividing the lens pupil into tow halves. The light from both halves of the pupil are correlated separately by a rectangular grating and integrated by two photodiodes. The correlation is implemented by an oscillating array of prisms. Depending on the position of the focus, there will be a phase difference between the two time signals, which allows calculation of the distance to the object. By using an array of lenses and an array of photodiodes, the solid angle that can be seen by the lens will be divided into several elements. This makes the determination of the average distance in each solid angle element possible and ensures extracting multiple distance data. The main advantages of this method are: 1) no structured illumination is required, i.e. it is a passive method, 2) it is a real-time method and 3) the average distance to all objects in one solid angle element is calculated.

Paper Details

Date Published: 29 October 1996
PDF: 12 pages
Proc. SPIE 2904, Intelligent Robots and Computer Vision XV: Algorithms, Techniques,Active Vision, and Materials Handling, (29 October 1996); doi: 10.1117/12.256267
Show Author Affiliations
Jochen Schwab, CORRSYS GmbH (Germany)


Published in SPIE Proceedings Vol. 2904:
Intelligent Robots and Computer Vision XV: Algorithms, Techniques,Active Vision, and Materials Handling
David P. Casasent, Editor(s)

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