24 October 2007 Co-registration of hyperspectral bands
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Abstract
A hyperspectral consists of a great number of spectral images. Although these spectral images are obtained simultaneously, due to a number of optical effects the hyperspectral bands are not co-registered. This has been found to be particularly prominent in images of regions near the absorption bands of atmospheric gases. We have developed a method using subpixel image registration that enables us to identify the spatial misregistration between spectral bands and correct it. We use one band as a reference band and match all other spectral images to this band. We use the average row and column disparity to correct the spatial misregistration. Other than the spatial correction that we obtain we also obtain a mapping of the atmospheric gas absorption features. This is done by plotting the average disparities as a function of wavelength. Local peaks in this plot are clear evidence of absorption features of the atmospheric gases. Our method is robust to the low snr in the atmospheric absorption images with low transmission. The correction, results in a hyperspectral cube with all the bands spatially aligned. The algorithm has been applied to the following hyperspectral imagers : AISA Hawk, AISA Eagle, AVIRIS and HYPERION.
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Zvi Figov, Zvi Figov, Karni Wolowelsky, Karni Wolowelsky, Nitzan Goldberg, Nitzan Goldberg, } "Co-registration of hyperspectral bands", Proc. SPIE 6748, Image and Signal Processing for Remote Sensing XIII, 67480S (24 October 2007); doi: 10.1117/12.737950; https://doi.org/10.1117/12.737950
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