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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 22 — Oct. 29, 2007
  • pp: 14817–14837

Joint nonuniform illumination estimation and deblurring for bar code signals

Jeongtae Kim and Hana Lee  »View Author Affiliations


Optics Express, Vol. 15, Issue 22, pp. 14817-14837 (2007)
http://dx.doi.org/10.1364/OE.15.014817


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Abstract

We present a novel joint nonuniform illumination estimation and deblurring method for bar code signals based on a penalized nonlinear squares objective function. The objective function is based on the proper parameterization of a bar code signal and nonuniform illumination as well as a regularization on the illumination using a smoothness penalty. By the minimization of the objective function, the proposed method simultaneously estimates the bar code signal and illumination in the spatial domain. In simulations and experiments, the proposed method showed improved performance compared with two conventional bar code decoding methods without deblurring or nonuniform illumination correction. In a few iterations, the proposed method was able to decode test bar code signals that were not decodable due to blurring or nonuniform illumination.

© 2007 Optical Society of America

OCIS Codes
(100.3020) Image processing : Image reconstruction-restoration
(100.3190) Image processing : Inverse problems
(150.2950) Machine vision : Illumination
(100.1455) Image processing : Blind deconvolution

ToC Category:
Image Processing

History
Original Manuscript: August 28, 2007
Revised Manuscript: October 16, 2007
Manuscript Accepted: October 22, 2007
Published: October 25, 2007

Citation
Jeongtae Kim and Hana Lee, "Joint nonuniform illumination estimation and deblurring for bar code signals," Opt. Express 15, 14817-14837 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-22-14817


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