Spectral matching imager using amplitude-modulation-coded multispectral light-emitting diode illumination

Akira Kimachi; Hisashi Ikuta; Yusuke Fujiwara; Mitsuharu Masumoto; Hitoshi Matsuyama

doi:10.1117/1.1666679

1 April 2004 Spectral matching imager using amplitude-modulation-coded multispectral light-emitting diode illumination

Akira Kimachi, Hisashi Ikuta, Yusuke Fujiwara, Mitsuharu Masumoto, Hitoshi Matsuyama

Author Affiliations +

Optical Engineering, Vol. 43, Issue 4, (April 2004). https://doi.org/10.1117/1.1666679

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.

©(2004) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Akira Kimachi, Hisashi Ikuta, Yusuke Fujiwara, Mitsuharu Masumoto, and Hitoshi Matsuyama "Spectral matching imager using amplitude-modulation-coded multispectral light-emitting diode illumination," Optical Engineering 43(4), (1 April 2004). https://doi.org/10.1117/1.1666679

Published: 1 April 2004

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available