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Pixel Club Seminar: A Parallel Algorithm for Sparse Demixing - Applied to Retinal Imaging and Remote Sensing
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Martin Ehler (Departments of Mathematics and Earth and Ocean Science, University of British Columbia)
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Thursday, 2.9.2010, 14:30
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Room 337-8 Taub Bld.
The talk addresses the analysis of multi-spectral retinal image sets and hyperspectral satellite images. Pixels in such image sets represent mixtures of pure substances, called endmembers. The linear mixture model for hyperspectral imaging assumes that each pixel is a linear combination of the spectra of a collection of endmembers. To demix each pixel, these endmembers must be identified. A novel parallel algorithm to extract endmembers and demix each pixel is presented.

Typical algorithms for endmember extraction do not use that each pixel is a combination of only few endmembers. Unlike others, our algorithm is based on the sparse representation of each pixel. The proposed algorithm solves a series of independent minimization problems with sparsity constraints and then identifies endmembers according to a ranking of the computed coefficients.
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