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Sensors 2010, 10(1), 47-60; doi:10.3390/s100100047

A Focusing Method in the Calibration Process of Image Sensors Based on IOFBs

1,* , 1
1 Electronics Department, Superior Polytechnic School, University of Alcalá, Universitary Campus, Alcalá de Henares 28871, Madrid, Spain 2 Telecommunication Department, University of Oriente, Av. de las Américas, SN, Santiago de Cuba 90900, Cuba
* Author to whom correspondence should be addressed.
Received: 29 October 2009 / Revised: 14 November 2009 / Accepted: 27 November 2009 / Published: 24 December 2009
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain)
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A focusing procedure in the calibration process of image sensors based on Incoherent Optical Fiber Bundles (IOFBs) is described using the information extracted from fibers. These procedures differ from any other currently known focusing method due to the non spatial in-out correspondence between fibers, which produces a natural codification of the image to transmit. Focus measuring is essential prior to carrying out calibration in order to guarantee accurate processing and decoding. Four algorithms have been developed to estimate the focus measure; two methods based on mean grey level, and the other two based on variance. In this paper, a few simple focus measures are defined and compared. Some experimental results referred to the focus measure and the accuracy of the developed methods are discussed in order to demonstrate its effectiveness.
Keywords: image sensor; image transmission; sensor calibration; optical fiber sensors image sensor; image transmission; sensor calibration; optical fiber sensors
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Fernández, P.R.; Lázaro, J.L.; Gardel, A.; Cano, Á.E.; Bravo, I. A Focusing Method in the Calibration Process of Image Sensors Based on IOFBs. Sensors 2010, 10, 47-60.

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