Spectral matching imager using correlation image sensor and AM-coded multispectral illumination

Akira Kimachi; Hisashi Ikuta; Yusuke Fujiwara; Hitoshi Matsuyama

doi:10.1117/12.476778

16 May 2003 Spectral matching imager using correlation image sensor and AM-coded multispectral illumination

Akira Kimachi, Hisashi Ikuta, Yusuke Fujiwara, Hitoshi Matsuyama

Proceedings Volume 5017, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications IV; (2003) https://doi.org/10.1117/12.476778
Event: Electronic Imaging 2003, 2003, Santa Clara, CA, United States

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.

Citation Download Citation

Akira Kimachi, Hisashi Ikuta, Yusuke Fujiwara, and Hitoshi Matsuyama "Spectral matching imager using correlation image sensor and AM-coded multispectral illumination", Proc. SPIE 5017, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications IV, (16 May 2003); https://doi.org/10.1117/12.476778

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