Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Image Enhancement using Intensity Deviation of Boundary Regions

경계 영역의 밝기 편차를 이용한 영상의 화질 향상 기법

  • Hwang, Jae-Min (School of Electrical Electronics and Control & Instrumentation, Changwon National University) ;
  • Kwon, Oh-Seol (School of Electrical Electronics and Control & Instrumentation, Changwon National University)
  • 황재민 (창원대학교 전기전자제어공학부) ;
  • 권오설 (창원대학교 전기전자제어공학부)
  • Received : 2014.08.21
  • Accepted : 2014.11.27
  • Published : 2014.12.25
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Abstract

Image enhancement has become an important area of study with the recent development of hi-fidelity devices, such as UHD displays. While conventional methods are able to enhance the image contrast and detail, this sometimes results in contrast reversion in boundary region. Therefore, this paper proposes the use of multi-layers and intensity deviation in boundary areas to enhance the perceived image quality. First, the image contrast of individual blocks is enhanced using multi-layers with different sizes. After calculating the block boundaries, weights are then determined based on the intensity deviation and used to enhance the image detail. Experiments with several test images confirm that the proposed algorithm is superior that image contrast and detail to conventional methods.

최근 초고해상도 디스플레이의 개발로 영상의 화질 향상에 관한 연구가 활발히 이루어지고 있다. 기존의 화질 향상 방법은 대비와 디테일을 동시에 향상시키는 과정에서 경계 영역을 중심으로 대비의 역전현상이 발생하는 문제가 있다. 본 논문은 영상의 화질 향상을 향상하는 과정에서 계층적 정보와 경계 영역의 밝기편차를 고려함으로써 이를 해결하고자 하였다. 먼저 크기가 다른 계층들에 대하여 블록의 크기별로 대비를 향상한다. 다음으로 각 블록별 경계영역을 계산하고 해당 영역의 밝기 변화율을 기반으로 가중치를 결정한다. 결정된 가중치를 이용하여 디테일 향상을 수행한다. 다양한 영상에 대하여 실험한 결과 제안한 알고리즘의 대비 및 디테일이 우수함을 확인하였다.

Keywords

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