Retrospective correction of nonuniform illumination on bi-level images

Hana Lee, Jeongtae Kim

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


We propose a novel method for correcting the effect of nonuniform illumination on a bi-level image. The proposed method is based on a penalized nonlinear least squares objective function that measures the binariness of an image and the roughness of illumination. Compared with conventional methods, it has the advantages of 1) not suffering from a trivial minimizer, 2) not requiring tuning of design parameters, and 3) effective optimization. In addition, it yields a unique solution since the minimization of the objective function is well-posed. In simulations and experiments, the method showed better accuracy and speed than the conventional entropy-based method.

Original languageEnglish
Pages (from-to)23880-23893
Number of pages14
JournalOptics Express
Issue number26
StatePublished - 21 Dec 2009


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