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Applied Optics

Applied Optics


  • Vol. 39, Iss. 5 — Feb. 10, 2000
  • pp: 803–813

Optically computing the hit–miss transform for an automated cervical smear screening system

John L. Metz and Kristina M. Johnson  »View Author Affiliations

Applied Optics, Vol. 39, Issue 5, pp. 803-813 (2000)

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The hit–miss transform serves as a region-of-interest locator for cells from cervical smear images that show abnormal changes, which are indicative of malignancy, in their nuclei. An optical implementation of the hit–miss transform algorithm uses an analog spatial light modulator for gray-scale modulation at the filter plane of a 4f optical correlator. Gray-scale modulation at the filter plane improves correlator performance in comparison with a binary phase-only filter (BPOF) by reduction of the edge enhancement of kernels used in morphological detection of cancerous cervical cells. The hit–miss transform with a gray-scale amplitude and binary phase optical filter (GABPOF) for the hit filter and a BPOF for the miss filter shows a 47% reduction in total error versus the use of only BPOF filters to locate abnormal cells.

© 2000 Optical Society of America

OCIS Codes
(070.1170) Fourier optics and signal processing : Analog optical signal processing
(070.4550) Fourier optics and signal processing : Correlators
(100.5010) Image processing : Pattern recognition
(200.4690) Optics in computing : Morphological transformations

Original Manuscript: June 17, 1999
Revised Manuscript: October 21, 1999
Published: February 10, 2000

John L. Metz and Kristina M. Johnson, "Optically computing the hit–miss transform for an automated cervical smear screening system," Appl. Opt. 39, 803-813 (2000)

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