Coded aperture imaging with uniformly redundant arrays.

@article{Fenimore1978CodedAI,
  title={Coded aperture imaging with uniformly redundant arrays.},
  author={Edward E. Fenimore and T. Michael Cannon},
  journal={Applied optics},
  year={1978},
  volume={17 3},
  pages={
          337-47
        }
}
Uniformly redundant arrays (URA) have autocorrelation functions with perfectly flat sidelobes. The URA combines the high-transmission characteristics of the random array with the flat sidelobe advantage of the nonredundant pinhole arrays. This gives the URA the capability to image low-intensity, low-contrast sources. Furthermore, whereas the inherent noise in random array imaging puts a limit on the obtainable SNR, the URA has no such limit. Computer simulations show that the URA with… 

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The authors have conducted research on coded aperture patterns composed of cyclic difference set uniformly redundant arrays (URA) such that the system point-spread-function is a delta function and no

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It is shown that when SNR is high and thermal noise dominates shot noise, spectrally-flat masks are optimal, but that when shot noise dominates thermal noise, randomly generated masks with lower transmissivity offer greater performance.

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Four experiments were conducted to investigate the amount of noise reduction provided by coded apertures when used in photographic cameras, focusing on the effects of coding mask sizes, positioning, mosaicing and rotation.
...

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