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Title: Approximate area-to-point regression kriging for fast hyperspectral image sharpening
Authors: Wang, Q 
Shi, W 
Atkinson, PM
Wei, Q
Issue Date: Jan-2017
Source: IEEE journal of selected topics in applied earth observations and remote sensing, Jan. 2017, v. 10, no. 1, p. 286-295
Abstract: Area-to-point regression kriging (ATPRK) is an advanced image fusion approach in remote sensing In this paper, ATPRK is considered for sharpening hyperspectral images (HSIs), based on the availability of a fine spatial resolution panchromatic or multispectral image. ATPRK can be used straightforwardly to sharpen each coarse hyperspectral band in turn. This scheme, however, is computationally expensive due to the large number of bands in HSIs, and this problem is exacerbated for multiscene or multitemporal analysis. Thus, we extend ATPRK for fast HSI sharpening with a new approach, called approximate ATPRK (AATPRK), which transforms the original HSI to a new feature space and image fusion is performed for only the first few components before back transformation. Experiments on two HSIs show that AATPRK greatly expedites ATPRK, but inherits the advantages of ATPRK, including maintaining a very similar performance in sharpening (both ATPRK and AATPRK can produce more accurate results than seven benchmark methods) and precisely conserving the spectral properties of coarse HSIs.
Keywords: Area-to-point regression kriging (ATPRK)
Downscaling
Geostatistics
Hyperspectral image (HSI)
Image fusion
Sharpening
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE journal of selected topics in applied earth observations and remote sensing 
ISSN: 1939-1404
EISSN: 2151-1535
DOI: 10.1109/JSTARS.2016.2569480
Rights: © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
The following publication Wang, Q., Shi, W., Atkinson, P. M., & Wei, Q. (2016). Approximate area-to-point regression kriging for fast hyperspectral image sharpening. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 10(1), 286-295 is available at https://doi.org/10.1109/JSTARS.2016.2569480
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