Multisource flash system for retroreflective beacon detection in CMOS cameras

Håkan Fredriksson; Kalevi Hyyppä

doi:10.1117/1.3000582

1 October 2008 Multisource flash system for retroreflective beacon detection in CMOS cameras

Håkan Fredriksson, Kalevi Hyyppä

Author Affiliations +

Optical Engineering, Vol. 47, Issue 10, 103001 (October 2008). https://doi.org/10.1117/1.3000582

Abstract

We present a method for improving a flash system for retroreflective beacon detection in CMOS cameras. Generally, flash systems are designed in such a manner that makes them suited for beacon detection in a small range interval. We strive to increase the flash system range interval by exploiting the directional properties of the retroreflector. Thus, light sources placed relatively far away from the optical axis of the camera will contribute only when the retroreflector is far away. This fact can be used to compensate for the 1/distance² dependency of optical power. We present underlying theory and formulae, then describe a flash system consisting of several light-emitting diodes that was designed by considering the presented method. Simulations show that the usable flash range of the improved system can be almost doubled compared to a general flash system. Tests were performed indicating that the presented method works according to theory and simulations.

©(2008) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Håkan Fredriksson and Kalevi Hyyppä "Multisource flash system for retroreflective beacon detection in CMOS cameras," Optical Engineering 47(10), 103001 (1 October 2008). https://doi.org/10.1117/1.3000582

Published: 1 October 2008

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