Uniformly redundant arrays
A recent development in coded aperture imaging removed the basic limitation on the quality of the reconstructed images when a correlation analysis is used. A pattern of holes for the aperture was designed that has an autocorrelation that is perfectly flat. The pattern is referred to as a uniformly redundant array (URA) and combines the high-transmission characteristics of the random arrays and Fresnel zone plate with the flat sidelobe advantage of the nonredundant pinhole array. An analysis procedure was developed (balanced correlation) that, when combined with the URA, gives a system point-spread function which is exactly a delta function. Computer simulations were used to demonstrate that, with random arrays, the balanced correlation is able to improve the reconstructed images by orders of magnitude. Additional orders of magnitude improvement are possible if the URA pattern is used. 6 figures.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5259442
- Report Number(s):
- LA-UR-77-2683; CONF-771206-22
- Resource Relation:
- Conference: Digital signal processing symposium, Albuquerque, NM, USA, 6 Dec 1977
- Country of Publication:
- United States
- Language:
- English
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