Spectral matching imager with three-phase quadrature detection

Akira Kimachi; Shigeru Ando; Motonori Doi; Shogo Nishi

doi:10.1117/12.839104

18 January 2010 Spectral matching imager with three-phase quadrature detection

Akira Kimachi, Shigeru Ando, Motonori Doi, Shogo Nishi

Proceedings Volume 7528, Color Imaging XV: Displaying, Processing, Hardcopy, and Applications; 75280E (2010) https://doi.org/10.1117/12.839104
Event: IS&T/SPIE Electronic Imaging, 2010, San Jose, California, United States

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.

Citation Download Citation

Akira Kimachi, Shigeru Ando, Motonori Doi, and Shogo Nishi "Spectral matching imager with three-phase quadrature detection", Proc. SPIE 7528, Color Imaging XV: Displaying, Processing, Hardcopy, and Applications, 75280E (18 January 2010); https://doi.org/10.1117/12.839104

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