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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 3 — Jan. 20, 2010
  • pp: 471–478

Content-addressable holographic data storage system for invariant pattern recognition of gray-scale images

Joby Joseph, Alpana Bhagatji, and Kehar Singh  »View Author Affiliations


Applied Optics, Vol. 49, Issue 3, pp. 471-478 (2010)
http://dx.doi.org/10.1364/AO.49.000471


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Abstract

Conventionally a holographic data storage system uses binary digital data as the input pages. We propose and demonstrate the use of a holographic data storage system for the purpose of invariant pattern recognition of gray-scale images. To improve the correlation accuracy for gray-scale images, we present a coding technique, phase Fourier transform (phase-FT) coding, to code a gray-scale image into a random and balanced digital binary image. In addition to the fact that a digital data page is obtained for incorporation into a holographic data storage system, this phase-FT coded image produces dc-free homogenized Fourier spectrum. This coded image can also be treated as an image for further processing, such as synthesis of distortion-invariant filters for invariant pattern recognition. A space-domain synthetic discriminant function (SDF) filter has been synthesized using these phase-FT coded images for rotation-invariant pattern recognition. Both simulation and experimental results are presented. The results show good correlation accuracy in comparison to correlation results obtained for SDF filter synthesized using the original gray-scale images themselves.

© 2010 Optical Society of America

OCIS Codes
(100.5760) Image processing : Rotation-invariant pattern recognition
(100.6740) Image processing : Synthetic discrimination functions
(210.2860) Optical data storage : Holographic and volume memories

ToC Category:
Image Processing

History
Original Manuscript: August 24, 2009
Revised Manuscript: December 12, 2009
Manuscript Accepted: December 18, 2009
Published: January 15, 2010

Citation
Joby Joseph, Alpana Bhagatji, and Kehar Singh, "Content-addressable holographic data storage system for invariant pattern recognition of gray-scale images," Appl. Opt. 49, 471-478 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-3-471

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