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Sensors 2015, 15(5), 12053-12079;

Multisensor Super Resolution Using Directionally-Adaptive Regularization for UAV Images

Department of Image, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 156-756, Korea
Author to whom correspondence should be addressed.
Received: 27 March 2015 / Accepted: 20 May 2015 / Published: 22 May 2015
(This article belongs to the Special Issue UAV Sensors for Environmental Monitoring)
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In various unmanned aerial vehicle (UAV) imaging applications, the multisensor super-resolution (SR) technique has become a chronic problem and attracted increasing attention. Multisensor SR algorithms utilize multispectral low-resolution (LR) images to make a higher resolution (HR) image to improve the performance of the UAV imaging system. The primary objective of the paper is to develop a multisensor SR method based on the existing multispectral imaging framework instead of using additional sensors. In order to restore image details without noise amplification or unnatural post-processing artifacts, this paper presents an improved regularized SR algorithm by combining the directionally-adaptive constraints and multiscale non-local means (NLM) filter. As a result, the proposed method can overcome the physical limitation of multispectral sensors by estimating the color HR image from a set of multispectral LR images using intensity-hue-saturation (IHS) image fusion. Experimental results show that the proposed method provides better SR results than existing state-of-the-art SR methods in the sense of objective measures. View Full-Text
Keywords: multisensor super-resolution (SR); UAV image enhancement; regularized image restoration; image fusion multisensor super-resolution (SR); UAV image enhancement; regularized image restoration; image fusion
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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Kang, W.; Yu, S.; Ko, S.; Paik, J. Multisensor Super Resolution Using Directionally-Adaptive Regularization for UAV Images. Sensors 2015, 15, 12053-12079.

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