Passive method for extracting multiple distance data in real time

Jochen Schwab

doi:10.1117/12.256267

29 October 1996 Passive method for extracting multiple distance data in real time

Jochen Schwab

Proceedings Volume 2904, Intelligent Robots and Computer Vision XV: Algorithms, Techniques,Active Vision, and Materials Handling; (1996) https://doi.org/10.1117/12.256267
Event: Photonics East '96, 1996, Boston, MA, United States

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.

Citation Download Citation

Jochen Schwab "Passive method for extracting multiple distance data in real time", Proc. SPIE 2904, Intelligent Robots and Computer Vision XV: Algorithms, Techniques,Active Vision, and Materials Handling, (29 October 1996); https://doi.org/10.1117/12.256267

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