Comparison of reconstruction algorithms for images from sparse-aperture systems

James R. Fienup; Douglas K. Griffith; L. Harrington; A. M. Kowalczyk; Jason J. Miller; James A. Mooney

doi:10.1117/12.452396

23 December 2002 Comparison of reconstruction algorithms for images from sparse-aperture systems

James R. Fienup, Douglas K. Griffith, L. Harrington, A. M. Kowalczyk, Jason J. Miller, James A. Mooney

Author Affiliations +

Proceedings Volume 4792, Image Reconstruction from Incomplete Data II; (2002) https://doi.org/10.1117/12.452396
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Telescopes and imaging interferometers with sparsely filled apertures can be lighter weight and less expensive than conventional filled-aperture telescopes. However, their greatly reduced MTF’s cause significant blurring and loss of contrast in the collected imagery. Image reconstruction algorithms can correct the blurring completely when the signal-to-noise (SNR) is high, but only partially when the SNR is low. This paper compares both linear (Wiener) and nonlinear (iterative maximum likelihood) algorithms for image reconstruction under a variety of circumstances. These include high and low SNR, Gaussian noise and Poisson-noise dominated, and a variety of aperture configurations and degrees of sparsity. The quality metric employed to compare algorithms is image utility as quantified by the National Imagery Interpretability Rating Scale (NIIRS). On balance, a linear reconstruction algorithm with a power-law power-spectrum estimate performed best.

Citation Download Citation

James R. Fienup, Douglas K. Griffith, L. Harrington, A. M. Kowalczyk, Jason J. Miller, and James A. Mooney "Comparison of reconstruction algorithms for images from sparse-aperture systems", Proc. SPIE 4792, Image Reconstruction from Incomplete Data II, (23 December 2002); https://doi.org/10.1117/12.452396

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