SUPER-RESOLUTION RECONSTRUCTION OF HYPERSPECTRAL IMAGES VIA AN IMPROVED MAP-BASED APPROACH

Date

2016-07-15

Author

Irmak, Hasan
Akar, Gözde
Yuksel, Seniha Esen
Aytaylan, Hakan

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Super-resolution Reconstruction (SRR) is technique to increase the spatial resolution of images. It is especially useful for hyperspectral images (HSI), which have good spectral resolution but low spatial resolution. In this study, we propose an improvement to our previous work and present a novel MAP-MRF (maximum a posteriori-Markov random Fields) based approach for the SRR of HSI. The key point of our approach is to find the abundance maps of an HSI and perform SRR on the abundance maps using MRF based energy minimization, without needing any other additional source of information. In order to do so, first, PCA is used to determine the endmembers. Second, SISAL and fully constraint least squares (FCLS) are used to estimate the abundance maps. Third, in order to find the high resolution abundance maps, the ill-posed inverse SRR problem for abundances is regularized with a MAP-MRF based approach. The MAP-MRF formulation is restricted with the constraints which are specific to the abundances. Using the non-linear programming (NLP) techniques, the convex MAP formulation is minimized and High Resolution (HR) abundance maps are obtained. Then, these maps are used to construct the HR HSI. This improved SRR method is verified on real data sets, and quantitative performance comparison is achieved using PSNR, SSIM and PSNR metrics. Our results indicate that this improved method gives very close results to the original high resolution images, keeps the spectral consistency, and performs better than the compared algorithms.

Subject Keywords

Hyperspectral, Super-resolution Reconstruction, MAP-MRF, Non-linear programming

URI

https://hdl.handle.net/11511/42491

DOI

https://doi.org/10.1109/igarss.2016.7730889

Collections

Department of Electrical and Electronics Engineering, Conference / Seminar

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Citation Formats

H. Irmak, G. Akar, S. E. Yuksel, and H. Aytaylan, “SUPER-RESOLUTION RECONSTRUCTION OF HYPERSPECTRAL IMAGES VIA AN IMPROVED MAP-BASED APPROACH,” 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42491.