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• Lázaro, JL.
• Cano, AE.
• Fernández, PR.
• Luna, CA.
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• Lázaro, JL.
• Cano, AE.
• Fernández, PR.
• Luna, CA.
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• Lázaro, JL.
• Cano, AE.
• Fernández, PR.
• Luna, CA.

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Sensors 2009, 9(12), 10434-10446; doi:10.3390/s91210434

Article

Sensor for Distance Estimation Using FFT of Images

José L. Lázaro¹ , Angel E. Cano² , Pedro R. Fernández¹  and Carlos A. Luna¹

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 (90900), Cuba

* Author to whom correspondence should be addressed.

Received: 6 November 2009; in revised form: 2 December 2009 / Accepted: 15 December 2009 / Published: 22 December 2009

(This article belongs to the Section Physical Sensors)

Download PDF Full-Text [708 KB, uploaded 22 December 2009 15:40 CET]

Abstract: In this paper, the problem of how to estimate the distance between an infrared emitter diode (IRED) and a camera from pixel grey-level intensities is examined from a practical standpoint. Magnitudes that affect grey level intensity were defined and related to the zero frequency component from the FFT image. A general model was also described and tested for distance estimation over the range from 420 to 800 cm using a differential methodology. Method accuracy is over 3%.

Keywords: Fast Fourier Transform; zero-frequency component; distance estimation; infrared; differential method; artificial vision

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