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Burak Kurt

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Proceedings Article | 23 October 2014 Paper

Pansharpening of multispectral images using filtering in Fourier domain

Alper Akoguz, Burak Kurt, Sedef Pinar

Proceedings Volume 9244, 92441X (2014) https://doi.org/10.1117/12.2067255

KEYWORDS: Image fusion, Linear filtering, Image filtering, Image processing, Remote sensing, Image quality, Satellites, Multispectral imaging, Fourier transforms, Sensors

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In this study, there is examined filtering based pansharpening methods which means of using several 2D FIR filters in Fourier domain which implies that the filters are applied after taking 2D Discrete Fourier Transform of both multispectral and panchromatic image and after the pansharpening process in Fourier domain, the resulting pansharpened image is obtained with an inverse 2D DFT. In addition, these methods are compared with commonly used fusion methods which are combined as modulation based and component substitution based methods. The algorithms are applied to SPOT 6 co-registered image couples that were acquired simultaneously. Couples are chosen for three different regions which are a city image (Gebze/Turkey), a forest image (Istanbul/Turkey) and an agriculture field image (Sanliurfa/Turkey) in order to analyse the methods in different regional characteristics. These methods are compared by the fusion quality assessments that have common acceptance in community. The results of these quality assessments shows the filtering based methods had the best scores among the traditional methods.

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