Efficient discrimination of active lighting in machine vision

Details Efficient discrimination of active lighting in machine vision Efficient discrimination of active lighting in machine vision

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001spie.4572..193v&link_type=abstract

Proc. SPIE Vol. 4572, p. 193-198, Intelligent Robots and Computer Vision XX: Algorithms, Techniques, and Active Vision, David P.

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A new optical arrangement is introduced for such applications of machine vision that need to discriminate structured laser lighting from stray ambient lighting. Instead of using transmissive filters that usually have high attenuation, a double reflective filter arrangement is presented. A combination of dielectric and metallic mirrors achieves steep stopband attenuation especially in the near infrared region where Si detectors are sensitive and common blackbody-like radiators have high spectral density. An additional advantage follows from the compact size of such a Maksutov-type mirror telescope. Compared to a corresponding refractive design, the length is reduced to less than half.

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