The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Fast Correction of Nonuniform Illumination on Bi-level Images using Block Based Intensity Normalization

블록 기반 밝기 표준화를 통한 이진영상의 고속 불균일 조명 보정

  • Joung, Ji-Hye (Department of Electronics Engineering, Ewha Womans University) ;
  • Kim, Jeong-Tae (Department of Electronics Engineering, Ewha Womans University)
  • 정지혜 (이화여자대학교 대학원 전자공학과) ;
  • 김정태 (이화여자대학교 전자공학과)
  • Received : 2012.08.28
  • Accepted : 2012.11.27
  • Published : 2012.12.01
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Abstract

We investigated a novel fast non-uniform illumination correction method for bi-level images. The proposed method divides a bi-level image into sub-images and roughly estimates block-wise illumination by low pass filtered maximum values of sub-images. After that, we apply bilinear interpolation using the block-wise illumination to estimate non-uniform illumination, and compensate for the effect of non-uniform illumination using the estimated illumination. Since the proposed method is not based on computation intensive iterative optimization, the proposed method can be used effectively for applications that require fast correction of non-uniform illumination. In simulations, the proposed method showed more than 20 times faster speed than existing entropy minimization method. Moreover, in simulations and experiments, the restored images by the proposed method were more close to true images than images restored by conventional method.

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References

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