Joint nonuniform illumination estimation and deblurring for bar code signals

Jeongtae Kim, Hana Lee

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


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.

Original languageEnglish
Pages (from-to)14817-14837
Number of pages21
JournalOptics Express
Issue number22
StatePublished - 29 Oct 2007


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