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Sensors 2018, 18(4), 1172; https://doi.org/10.3390/s18041172

Optimized Multi-Spectral Filter Array Based Imaging of Natural Scenes

1
College of Information Science and Engineering, Ningbo University, Ningbo 315000, China
2
College of Computer Science and Technology, Zhejiang University, Hangzhou 310000, China
3
Department of Computer Science, University of California, Irvine, CA 92697-3425, USA
*
Author to whom correspondence should be addressed.
Received: 2 March 2018 / Revised: 8 April 2018 / Accepted: 9 April 2018 / Published: 12 April 2018
(This article belongs to the Special Issue Snapshot Multi-Band Spectral and Polarization Imaging Systems)
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Abstract

Multi-spectral imaging using a camera with more than three channels is an efficient method to acquire and reconstruct spectral data and is used extensively in tasks like object recognition, relighted rendering, and color constancy. Recently developed methods are used to only guide content-dependent filter selection where the set of spectral reflectances to be recovered are known a priori. We present the first content-independent spectral imaging pipeline that allows optimal selection of multiple channels. We also present algorithms for optimal placement of the channels in the color filter array yielding an efficient demosaicing order resulting in accurate spectral recovery of natural reflectance functions. These reflectance functions have the property that their power spectrum statistically exhibits a power-law behavior. Using this property, we propose power-law based error descriptors that are minimized to optimize the imaging pipeline. We extensively verify our models and optimizations using large sets of commercially available wide-band filters to demonstrate the greater accuracy and efficiency of our multi-spectral imaging pipeline over existing methods. View Full-Text
Keywords: multi-spectral imaging; content independent channel selection; multispectral filter array; demosaicing multi-spectral imaging; content independent channel selection; multispectral filter array; demosaicing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Li, Y.; Majumder, A.; Zhang, H.; Gopi, M. Optimized Multi-Spectral Filter Array Based Imaging of Natural Scenes. Sensors 2018, 18, 1172.

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