Adaptive illumination source for multispectral vision system applied to material discrimination

Olga M. Conde; Adolfo Cobo; Paulino Cantero; David Conde; Jesús Mirapeix; Ana M. Cubillas; José M. López-Higuera

doi:10.1117/12.781496

25 April 2008 Adaptive illumination source for multispectral vision system applied to material discrimination

Olga M. Conde, Adolfo Cobo, Paulino Cantero, David Conde, Jesús Mirapeix, Ana M. Cubillas, José M. López-Higuera

Proceedings Volume 7000, Optical and Digital Image Processing; 70000Z (2008) https://doi.org/10.1117/12.781496
Event: SPIE Photonics Europe, 2008, Strasbourg, France

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.

Citation Download Citation

Olga M. Conde, Adolfo Cobo, Paulino Cantero, David Conde, Jesús Mirapeix, Ana M. Cubillas, and José M. López-Higuera "Adaptive illumination source for multispectral vision system applied to material discrimination", Proc. SPIE 7000, Optical and Digital Image Processing, 70000Z (25 April 2008); https://doi.org/10.1117/12.781496

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