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Sensors 2013, 13(6), 7184-7211; doi:10.3390/s130607184

Decoupling Intensity Radiated by the Emitter in Distance Estimation from Camera to IR Emitter

1
Communication Departament, Electrical Engineering College, University of Oriente, Av. Las Américas, Santiago de Cuba 90100, Cuba
2
Electronics Department, Superior Polytechnic School, University of Alcalá, University Campus, Alcalá de Henares 28871, Madrid, Spain
*
Author to whom correspondence should be addressed.
Received: 28 March 2013 / Revised: 14 May 2013 / Accepted: 28 May 2013 / Published: 31 May 2013
(This article belongs to the Section Physical Sensors)
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Abstract

Various models using radiometric approach have been proposed to solve the problem of estimating the distance between a camera and an infrared emitter diode (IRED). They depend directly on the radiant intensity of the emitter, set by the IRED bias current. As is known, this current presents a drift with temperature, which will be transferred to the distance estimation method. This paper proposes an alternative approach to remove temperature drift in the distance estimation method by eliminating the dependence on radiant intensity. The main aim was to use the relative accumulated energy together with other defined models, such as the zeroth-frequency component of the FFT of the IRED image and the standard deviation of pixel gray level intensities in the region of interest containing the IRED image. By using the abovementioned models, an expression free of IRED radiant intensity was obtained. Furthermore, the final model permitted simultaneous estimation of the distance between the IRED and the camera and the IRED orientation angle. The alternative presented in this paper gave a 3% maximum relative error over a range of distances up to 3 m.
Keywords: distance estimation sensor; radiometric; camera-to-emitter distance estimation; computer vision distance estimation sensor; radiometric; camera-to-emitter distance estimation; computer vision
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Cano-García, A.E.; Galilea, J.L.L.; Fernández, P.; Infante, A.L.; Pompa-Chacón, Y.; Vázquez, C.A.L. Decoupling Intensity Radiated by the Emitter in Distance Estimation from Camera to IR Emitter. Sensors 2013, 13, 7184-7211.

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