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Proceedings Paper

Spectral matching imager with three-phase quadrature detection
Author(s): Akira Kimachi; Shigeru Ando; Motonori Doi; Shogo Nishi
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Paper Abstract

This paper proposes a spectral matching imager with a novel three-phase quadrature detection method. The proposed imager consists of the time-domain correlation image sensor (CIS) and a high-speed programmable spectral light source (PSLS) to produce the correlations between each of a quadrature pair of reference spectral functions and spectral functions of objects. This is realized by modulating the object spectra into temporal signals with the PSLS and then producing temporal correlations with reference signals at each pixel of the CIS. The object that has the same spectral function as the target spectral function is detected as a vector with an azimuthal angle of zero projected onto the two-dimensional (2-D) space spanned by the reference spectral functions. The proposed method can estimate the correlation coefficient between the object and reference spectra more reliably in a 2-D space than previous 1-D spectral matching methods, by factoring out the norm of the object spectral function. Experimental results for a color chart confirm the effectiveness of the proposed method.

Paper Details

Date Published: 18 January 2010
PDF: 9 pages
Proc. SPIE 7528, Color Imaging XV: Displaying, Processing, Hardcopy, and Applications, 75280E (18 January 2010); doi: 10.1117/12.839104
Show Author Affiliations
Akira Kimachi, Osaka Electro-Communication Univ. (Japan)
Shigeru Ando, The Univ. of Tokyo (Japan)
Motonori Doi, Osaka Electro-Communication Univ. (Japan)
Shogo Nishi, Osaka Electro-Communication Univ. (Japan)

Published in SPIE Proceedings Vol. 7528:
Color Imaging XV: Displaying, Processing, Hardcopy, and Applications
Reiner Eschbach; Gabriel G. Marcu; Shoji Tominaga; Alessandro Rizzi, Editor(s)

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