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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 13 — May. 1, 2014
  • pp: C14–C24

Combining transverse field detectors and color filter arrays to improve multispectral imaging systems

Miguel A. Martínez, Eva M. Valero, Javier Hernández-Andrés, Javier Romero, and Giacomo Langfelder  »View Author Affiliations


Applied Optics, Vol. 53, Issue 13, pp. C14-C24 (2014)
http://dx.doi.org/10.1364/AO.53.000C14


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Abstract

This work focuses on the improvement of a multispectral imaging sensor based on transverse field detectors (TFDs). We aimed to achieve a higher color and spectral accuracy in the estimation of spectral reflectances from sensor responses. Such an improvement was done by combining these recently developed silicon-based sensors with color filter arrays (CFAs). Consequently, we sacrificed the filter-less full spatial resolution property of TFDs to narrow down the spectrally broad sensitivities of these sensors. We designed and performed several experiments to test the influence of different design features on the estimation quality (type of sensor, tunability, interleaved polarization, use of CFAs, type of CFAs, number of shots), some of which are exclusive to TFDs. We compared systems that use a TFD with systems that use normal monochrome sensors, both combined with multispectral CFAs as well as common RGB filters present in commercial digital color cameras. Results showed that a system that combines TFDs and CFAs performs better than systems with the same type of multispectral CFA and other sensors, or even the same TFDs combined with different kinds of filters used in common imaging systems. We propose CFA+TFD-based systems with one or two shots, depending on the possibility of using longer capturing times or not. Improved TFD systems thus emerge as an interesting possibility for multispectral acquisition, which overcomes the limited accuracy found in previous studies.

© 2014 Optical Society of America

OCIS Codes
(110.0110) Imaging systems : Imaging systems
(330.1690) Vision, color, and visual optics : Color
(330.1730) Vision, color, and visual optics : Colorimetry
(110.4234) Imaging systems : Multispectral and hyperspectral imaging

History
Original Manuscript: December 3, 2013
Revised Manuscript: March 19, 2014
Manuscript Accepted: March 19, 2014
Published: April 16, 2014

Virtual Issues
Vol. 9, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Miguel A. Martínez, Eva M. Valero, Javier Hernández-Andrés, Javier Romero, and Giacomo Langfelder, "Combining transverse field detectors and color filter arrays to improve multispectral imaging systems," Appl. Opt. 53, C14-C24 (2014)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-53-13-C14

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