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• Fernández, P
• Lázaro Galilea, J
• Gardel Vicente, A
• Bravo Muñoz, I
• Cano García, Á
• Luna Vázquez, C
• [+] on Google Scholar
• Fernández, P
• Lázaro Galilea, J
• Gardel Vicente, A
• Bravo Muñoz, I
• Cano García, Á
• Luna Vázquez, C
• [+] on PubMed
• Fernández, P
• Lázaro Galilea, J
• Gardel Vicente, A
• Bravo Muñoz, I
• Cano García, Á
• Luna Vázquez, C

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Sensors 2012, 12(7), 9006-9023; doi:10.3390/s120709006

Article

Improving the Calibration of Image Sensors Based on IOFBs, Using Differential Gray-Code Space Encoding

Pedro R. Fernández ^1,* , José Luis Lázaro Galilea ¹ , Alfredo Gardel Vicente ¹ , Ignacio Bravo Muñoz ¹ , Ángel E. Cano García ²  and Carlos Luna Vázquez ¹

¹ Electronics Department, University of Alcalá, Superior Polytechnic School, University Campus, Alcalá de Henares 28871, Madrid, Spain ² Telecommunication Department, University of Oriente, Av. de las Américas, SN, Santiago de Cuba 90400, Cuba

* Author to whom correspondence should be addressed.

Received: 15 May 2012; in revised form: 15 June 2012 / Accepted: 28 June 2012 / Published: 2 July 2012

(This article belongs to the Section Physical Sensors)

Download PDF Full-Text [1184 KB, uploaded 2 July 2012 10:55 CEST]

Abstract: This paper presents a fast calibration method to determine the transfer function for spatial correspondences in image transmission devices with Incoherent Optical Fiber Bundles (IOFBs), by performing a scan of the input, using differential patterns generated from a Gray code (Differential Gray-Code Space Encoding, DGSE). The results demonstrate that this technique provides a noticeable reduction in processing time and better quality of the reconstructed image compared to other, previously employed techniques, such as point or fringe scanning, or even other known space encoding techniques.

Keywords: image sensor; fiber imaging; image transmission; sensor calibration; optical fiber sensors

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