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Accession Number ADA570451
Title Innovative Methods for High Resolution Imaging.
Publication Date Aug 2012
Media Count 18p
Personal Author R. J. Plemmons T. C. Torgersen V. P. Pauca
Abstract The investigators report on their findings, recent publication, and presentations in the areas of lenslet array imaging, wavefront encoding, and non-negative matrix factorization for material component (end-member) identification. Lenslet arrays enable a number of imaging modalities, including amplitude diversity, polarization diversity, wavelength diversity (multi- spectral data) and phase diversity. Each of these techniques extends traditional imaging by modifying the data acquisition to implicitly capture features that would otherwise be undetectable. Post-processing converts implicitly captured or encoded information to a form suitable for human or automated identification tasks. The problem of material identification from multi-spectral image data (blind source separation) can be formulated as a non- negative matrix factorization problem or as a tensor factorization problem. Non- uniqueness and numerical stability are frequently difficult issues. We report here on recent progress on using stochastic constraints for improving the numerical stability of the computation. Current (2009) and prior results relating to pupil phase encoding were adapted to mitigate a frequency-agile pulsed laser attack against CCD-based cameras.
Keywords Biometric identification
Biometry
Charge coupled devices
High resolution
Hyperspectral imagery
Identification
Image processing
Lenslet array imaging
Lenslet arrays
Materials identification
Non-negative matrix factorization
Optical lenses
Ppe(Pupil phase engineering)
Pulsed lasers
Pupil phase encoding
Surveillance imaging
Tensors
Thermal injuries
Visual surveillance
Wavefront encoding
Wavefronts


 
Source Agency Non Paid ADAS
NTIS Subject Category 46C - Optics & Lasers
95C - Biomedical Instrumentation & Bioengineering
Corporate Author Wake Forest Univ., Winston-Salem, NC.
Document Type Technical report
Title Note Final rept., 5 Jul 2005-4 Jul 2009.
NTIS Issue Number 1314
Contract Number W911NF-05-1-0402

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