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Proceedings Paper

Adaptive illumination source for multispectral vision system applied to material discrimination
Author(s): Olga M. Conde; Adolfo Cobo; Paulino Cantero; David Conde; Jesús Mirapeix; Ana M. Cubillas; José M. López-Higuera
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Paper Abstract

A multispectral system based on a monochrome camera and an adaptive illumination source is presented in this paper. Its preliminary application is focused on material discrimination for food and beverage industries, where monochrome, color and infrared imaging have been successfully applied for this task. This work proposes a different approach, in which the relevant wavelengths for the required discrimination task are selected in advance using a Sequential Forward Floating Selection (SFFS) Algorithm. A light source, based on Light Emitting Diodes (LEDs) at these wavelengths is then used to sequentially illuminate the material under analysis, and the resulting images are captured by a CCD camera with spectral response in the entire range of the selected wavelengths. Finally, the several multispectral planes obtained are processed using a Spectral Angle Mapping (SAM) algorithm, whose output is the desired material classification. Among other advantages, this approach of controlled and specific illumination produces multispectral imaging with a simple monochrome camera, and cold illumination restricted to specific relevant wavelengths, which is desirable for the food and beverage industry. The proposed system has been tested with success for the automatic detection of foreign object in the tobacco processing industry.

Paper Details

Date Published: 25 April 2008
PDF: 11 pages
Proc. SPIE 7000, Optical and Digital Image Processing, 70000Z (25 April 2008); doi: 10.1117/12.781496
Show Author Affiliations
Olga M. Conde, Univ. de Cantabria (Spain)
Adolfo Cobo, Univ. de Cantabria (Spain)
Paulino Cantero, Univ. de Cantabria (Spain)
David Conde, Univ. de Cantabria (Spain)
Jesús Mirapeix, Univ. de Cantabria (Spain)
Ana M. Cubillas, Univ. de Cantabria (Spain)
José M. López-Higuera, Univ. de Cantabria (Spain)

Published in SPIE Proceedings Vol. 7000:
Optical and Digital Image Processing
Peter Schelkens; Touradj Ebrahimi; Gabriel Cristóbal; Frédéric Truchetet, Editor(s)

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