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Proceedings Paper

Spectral matching imager using correlation image sensor and AM-coded multispectral illumination
Author(s): Akira Kimachi; Hisashi Ikuta; Yusuke Fujiwara; Hitoshi Matsuyama
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Paper Abstract

In Electronic Imaging 2002 we proposed the spectral mathing imager, which detects an object having a particular spectral property out of a scene in real time using the correlation image sensor. This paper proposes another type of spectral matching imager that employs AM-coded multispectral illumination, instead of the variable wavelength monochrome illumination used previously, in order to increase power efficiency of the illumination. The AM-coded multispectral illumination consists of lights from LEDs with different illuminant spectra, which are also amplitude-modulated with orthogonal carrier signals. The reference signal to the correlation image sensor is created as a weighted sum of the AM signals with weights given by the values of a reference spectrum sampled at the peak wavelengths of the LED spectra. Owing to the orthogonality of the AM carrier signals, the correlation image sensor outputs the pixelwise spectral correlation between the imaged object and a reference material in every frame. The theory and an implementation of the AM-coded spectral matching imager are described and preliminary experimental results on a set of oxide-doped colored glass pieces are given.

Paper Details

Date Published: 16 May 2003
PDF: 8 pages
Proc. SPIE 5017, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications IV, (16 May 2003); doi: 10.1117/12.476778
Show Author Affiliations
Akira Kimachi, Osaka Electro-Communication Univ. (Japan)
Hisashi Ikuta, Osaka Electro-Communication Univ. (Japan)
Yusuke Fujiwara, Osaka Electro-Communication Univ. (Japan)
Hitoshi Matsuyama, Osaka Electro-Communication Univ. (Japan)

Published in SPIE Proceedings Vol. 5017:
Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications IV
Nitin Sampat; Morley M. Blouke; Nitin Sampat; Ricardo J. Motta; Ricardo J. Motta, Editor(s)

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