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Hybrid filter for noise reduction

잡음제거를 위한 하이브리드 필터

  • Joh, Beom Seok ;
  • Kim, Young Ro
  • 조범석 (명지전문대학 컴퓨터정보과) ;
  • 김영로 (명지전문대학 컴퓨터정보과)
  • Received : 2011.09.17
  • Accepted : 2011.12.08
  • Published : 2011.12.30

Abstract

In this paper, we propose a hybrid filter for noise reduction. The proposed method adjusts rational filtering direction according to an edge in the image using median filtered data. Rational filter modulates the coefficients of a linear lowpass filter to limit its action in presence of image details. By the ratio of polynomials in the input variables, rational filter reduces noise adaptively. Median filter is widely used to reduce impulse noise, but removes some details for highly corrupted images. Also, desirable details are removed when the window size is large. Our proposed algorithm combines rational filter and median filter. Thus, proposed method not only preserves edge, but also reduces noise in uniform region. Experimental results show that our proposed method has better quality than those by existing median and rational filtering methods.

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