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Optical Engineering

Spectral matching imager using amplitude-modulation-coded multispectral light-emitting diode illumination
Author(s): Akira Kimachi; Hisashi Ikuta; Yusuke Fujiwara; Mitsuharu Masumoto; Hitoshi Matsuyama
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Paper Abstract

We propose a spectral matching imager using light-emitting diodes (LEDs) of narrowband spectral power distributions. Each spectral channel of the LED illumination undergoes amplitude modulation (AM) with one of an orthonormal set of carrier signals. This imager, which employs the correlation image sensor (CIS) as its imaging device, performs spectral correlation pixelwise between a reference spectrum and that of the object in every frame by demodulating the orthonormal AM carriers via temporal correlation. This sensing principle enables a higher efficiency in the use of illumination power than the spectral matching imager we originally proposed. A twelve-channel AM-coded multispectral light source is developed by assembling commercial LEDs. Under this LED light source, experiments were carried out on pairs of glass pieces of a similar color, but with different spectral transmittance functions. The results confirmed that the proposed imager successfully performed spectral matching on each pair of glass pieces in real time.

Paper Details

Date Published: 1 April 2004
PDF: 11 pages
Opt. Eng. 43(4) doi: 10.1117/1.1666679
Published in: Optical Engineering Volume 43, Issue 4
Show Author Affiliations
Akira Kimachi, Osaka Electro-Communication Univ. (Japan)
Hisashi Ikuta, Osaka Electro-Comm Univ (Japan)
Yusuke Fujiwara, Osaka Electro-Comm Univ (Japan)
Mitsuharu Masumoto, Osaka Electro-Communication Univ. (Japan)
Hitoshi Matsuyama, Osaka Electro-Comm Univ (Japan)


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