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Sensors 2016, 16(5), 719; doi:10.3390/s16050719

Color Restoration of RGBN Multispectral Filter Array Sensor Images Based on Spectral Decomposition

Department of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Gonzalo Pajares Martinsanz
Received: 22 February 2016 / Revised: 12 May 2016 / Accepted: 13 May 2016 / Published: 18 May 2016
(This article belongs to the Special Issue Imaging: Sensors and Technologies)

Abstract

A multispectral filter array (MSFA) image sensor with red, green, blue and near-infrared (NIR) filters is useful for various imaging applications with the advantages that it obtains color information and NIR information simultaneously. Because the MSFA image sensor needs to acquire invisible band information, it is necessary to remove the IR cut-offfilter (IRCF). However, without the IRCF, the color of the image is desaturated by the interference of the additional NIR component of each RGB color channel. To overcome color degradation, a signal processing approach is required to restore natural color by removing the unwanted NIR contribution to the RGB color channels while the additional NIR information remains in the N channel. Thus, in this paper, we propose a color restoration method for an imaging system based on the MSFA image sensor with RGBN filters. To remove the unnecessary NIR component in each RGB color channel, spectral estimation and spectral decomposition are performed based on the spectral characteristics of the MSFA sensor. The proposed color restoration method estimates the spectral intensity in NIR band and recovers hue and color saturation by decomposing the visible band component and the NIR band component in each RGB color channel. The experimental results show that the proposed method effectively restores natural color and minimizes angular errors. View Full-Text
Keywords: color restoration; infrared cut-off filter removal; multispectral imaging; spectral estimation; spectral decomposition color restoration; infrared cut-off filter removal; multispectral imaging; spectral estimation; spectral decomposition
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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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MDPI and ACS Style

Park, C.; Kang, M.G. Color Restoration of RGBN Multispectral Filter Array Sensor Images Based on Spectral Decomposition. Sensors 2016, 16, 719.

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