DIGITAL PROCESSING OF ANNULAR CODED-APERTURE IMAGERY.

R. G. Simpson, Harrison H Barrett, J. A. Subach, H. D. Fisher

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

In the past, annular coded aperture images have been reconstructed by correlating an appropriately scaled annulus with the coded image. The basic improvement suggested in this paper is the addition of a linear radial frequency weighting in the Fourier plane. Reconstructions of point and disk objects were simulated with a computer program. The results show the advantage of this modification in the processing scheme. When the assumption is made that the detector is an Anger camera, the resolution obtained with the improved processing of the coded image is equal to that obtained with conventional apertures. An actual object consisting of the letter E was imaged with an annular aperture and a scintillation camera. The reconstruction with and without the improved processing is presented. In addition, the annulus is intermediate between the pinhole and the Fresnel zone plate with regard to both collection efficiency and the number of counts required for a given snr. It therefore offers an improvement over pinhole apertures without demanding the increased count rate and resolution required of detectors when Fresnel zone plate coded apertures are used.

Original languageEnglish (US)
Pages (from-to)490-494
Number of pages5
JournalOptical Engineering
Volume14
Issue number5
StatePublished - Sep 1975
Externally publishedYes

Fingerprint

Digital signal processing
imagery
apertures
Processing
Cameras
Detectors
annuli
pinholes
Scintillation
cameras
Computer program listings
detectors
scintillation
computer programs

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Simpson, R. G., Barrett, H. H., Subach, J. A., & Fisher, H. D. (1975). DIGITAL PROCESSING OF ANNULAR CODED-APERTURE IMAGERY. Optical Engineering, 14(5), 490-494.

DIGITAL PROCESSING OF ANNULAR CODED-APERTURE IMAGERY. / Simpson, R. G.; Barrett, Harrison H; Subach, J. A.; Fisher, H. D.

In: Optical Engineering, Vol. 14, No. 5, 09.1975, p. 490-494.

Research output: Contribution to journalArticle

Simpson, RG, Barrett, HH, Subach, JA & Fisher, HD 1975, 'DIGITAL PROCESSING OF ANNULAR CODED-APERTURE IMAGERY.', Optical Engineering, vol. 14, no. 5, pp. 490-494.
Simpson RG, Barrett HH, Subach JA, Fisher HD. DIGITAL PROCESSING OF ANNULAR CODED-APERTURE IMAGERY. Optical Engineering. 1975 Sep;14(5):490-494.
Simpson, R. G. ; Barrett, Harrison H ; Subach, J. A. ; Fisher, H. D. / DIGITAL PROCESSING OF ANNULAR CODED-APERTURE IMAGERY. In: Optical Engineering. 1975 ; Vol. 14, No. 5. pp. 490-494.
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