Experimental characterization of the quality of image reconstruction from a chromotomographic system

Kyle J. Dufaud; Michael R. Hawks; Ryan Tervo

doi:10.1117/12.2050361

13 June 2014 Experimental characterization of the quality of image reconstruction from a chromotomographic system

Kyle J. Dufaud, Michael R. Hawks, Ryan Tervo

Proceedings Volume 9088, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XX; 908818 (2014) https://doi.org/10.1117/12.2050361
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

Abstract

A fieldable hyperspectral chromotomographic imager has been developed at the Air Force Institute of Technology to refine component requirements for a space-based system. The imager uses a high speed visible band camera behind a direct-vision prism to simultaneously record two spatial dimensions and the spectral dimension. Capturing all three dimensions simultaneously allows for the hyperspectral imaging of transient events. The prism multiplexes the spectral and spatial information, so a tomographic reconstruction algorithm is required to separate hyperspectral channels. The fixed dispersion of the prism limits the available projections, leading to artifacts in the reconstruction which limit the image quality and spectrometric accuracy of the reconstructions. The amount of degradation is highly dependent on the content of the scene. Experiments were conducted to characterize the image and spectral quality as a function of spatial, spectral, and temporal complexity. We find that in general, image quality degrades as the source bandwidth increases. Spectra estimated from the reconstructed data cube are generally best for point-like sources, and can be highly inaccurate for extended scenes. In other words, the spatial accuracy varies inversely with the spectral width, and the spectral accuracy varies inversely with the spatial width. Experiment results also demonstrate the ability to reconstruct hyperspectral images from transient combustion events.

Citation Download Citation

Kyle J. Dufaud, Michael R. Hawks, and Ryan Tervo "Experimental characterization of the quality of image reconstruction from a chromotomographic system", Proc. SPIE 9088, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XX, 908818 (13 June 2014); https://doi.org/10.1117/12.2050361

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KEYWORDS

Prisms

Image quality

Lamps

Mercury

Hyperspectral imaging

Imaging systems

Tomography

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