Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Efficient Contrast Enhancement Using Histogram Specification

히스토그램 명세화를 이용한 효율적인 영상 대비 향상

  • Kim, Young-Ro (Dept. of Computer Science Information, Myongji College) ;
  • Park, Hyun-Sang (Division of Electrical Electronic and Control Engineering, Kongju National University)
  • 김영로 (명지전문대학 컴퓨터정보과) ;
  • 박현상 (공주대학교 전기전자제어공학부)
  • Received : 2010.09.28
  • Accepted : 2010.12.17
  • Published : 2010.12.31
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Abstract

In this paper, an efficient contrast enhancement algorithm using histogram specification is proposed. Histogram equalization and its modified methods have been effective techniques for contrast enhancement. However, they often result in excessive contrast enhancement. Besides conventional histogram specification also has a problem to get the desired histogram. We propose a method that utilizes a simple high frequency filter to get the desired histogram. The proposed technique not only produces better visual results than conventional contrast enhancement techniques, but is also adaptively adjusted to the statistical characteristics of the image.

본 논문에서는 히스토그램 명세화에 기반을 둔 효과적인 영상 대비 개선 알고리즘을 제안한다. 히스토그램 평활화나 이로부터 파생된 방법들은 영상 대비 개선에 효과적인 도구로 사용되어 왔으나, 과도한 대비 개선이라는 부작용을 수반하는 결과를 자주 낳게 된다. 반면 기존의 히스토그램 명세화는 의도한 히스토그램을 얻기에 부적절하다는 단점을 가지고 있다. 본 논문에서는 의도한 히스토그램을 얻기 위해서 고주파필터를 활용한 방법을 제안한다. 제안한 방법은 기존의 영상 대비 방법에 대해서 향상된 화질을 제공할 뿐만 아니라, 영상의 통계적 속성에 적응적으로대응하는 속성을 보여주고 있다.

Keywords

References

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