Multispectral demosaicking considering out-of-focus problem for red-green-blue-near-infrared image sensors

Ji Yong Kwon; Moon Gi Kang

doi:10.1117/1.JEI.25.2.023010

28 March 2016 Multispectral demosaicking considering out-of-focus problem for red-green-blue-near-infrared image sensors

Ji Yong Kwon, Moon Gi Kang

Author Affiliations +

Funded by: Korean Government (MSIP)

Journal of Electronic Imaging, Vol. 25, Issue 2, 023010 (March 2016). https://doi.org/10.1117/1.JEI.25.2.023010

Abstract

A near-infrared (NIR) band provides information invisible to human eyes for discriminating and recognizing objects more clearly under low lighting conditions. To capture color and NIR images simultaneously, a multispectral filter array (MSFA) sensor is used. However, because lenses have different refractive indices for different wavelengths, lenses may fail to focus all rays to the same convergence. This is the reason an out-of-focus problem occurs and images are blurred. In this paper, a demosaicking algorithm that considers the out-of-focus problem is proposed. This algorithm is used by the MSFA of a red-green-blue-NIR image sensor to obtain color and NIR images. After the energies of the multispectral (MS) channels in the MSFA image are balanced to minimize aliasing, that image is filtered by the estimated low-pass kernel to generate a panchromatic (PAN) image. When an image is acquired, the out-of-focus problem and the formation process of the PAN image are modeled. The desired MS image is estimated by solving the least squares approach of the difference between the PAN and MS images based on the models. The experimental results show that the proposed algorithm performs well in estimating high-quality MS images and reduces the out-of-focus problem.

Citation Download Citation

Ji Yong Kwon and Moon Gi Kang "Multispectral demosaicking considering out-of-focus problem for red-green-blue-near-infrared image sensors," Journal of Electronic Imaging 25(2), 023010 (28 March 2016). https://doi.org/10.1117/1.JEI.25.2.023010

Published: 28 March 2016

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE