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Sensors 2009, 9(11), 8896-8906; doi:10.3390/s91108896

Sensor for Distance Measurement Using Pixel Grey-Level Information

1
Electronics Department, University of Alcalá, Polytechnic School, University Campus, Alcalá de Henares, Madrid 28871, Spain
2
Telecommunications Department, Oriente University, Av. de las Américas, SN, Santiago de Cuba 90900, Cuba
*
Author to whom correspondence should be addressed.
Received: 30 September 2009 / Revised: 29 October 2009 / Accepted: 4 November 2009 / Published: 6 November 2009
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain)
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Abstract

An alternative method for distance measurement is presented, based on a radiometric approach to the image formation process. The proposed methodology uses images from an infrared emitting diode (IRED) to estimate the distance between the camera and the IRED. Camera output grey-level intensities are a function of the accumulated image irradiance, which is also related by inverse distance square law to the distance between the camera and the IRED. Analyzing camera-IRED distance, magnitudes that affected image grey-level intensities, and therefore accumulated image irradiance, were integrated into a differential model which was calibrated and used for distance estimation over a 200 to 600 cm range. In a preliminary model, the camera and the emitter were aligned. View Full-Text
Keywords: distance measurement; radiometry; cameras; calibration; infrared measurements; infrared image sensors distance measurement; radiometry; cameras; calibration; infrared measurements; infrared image sensors
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

Lázaro, J.L.; Cano, A.E.; Fernández, P.R.; Pompa, Y. Sensor for Distance Measurement Using Pixel Grey-Level Information. Sensors 2009, 9, 8896-8906.

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