Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Digital Filter Algorithm based on Mask Matching for Image Restoration in AWGN Environment

AWGN 환경에서 영상복원을 위한 마스크매칭 기반의 디지털 필터 알고리즘

  • Cheon, Bong-Won (Dept. of Smart Robot Convergence and Application Eng., Pukyong National University) ;
  • Kim, Nam-Ho (Dept. of Control and Instrumentation Eng., Pukyong National University)
  • Received : 2020.12.07
  • Accepted : 2020.12.23
  • Published : 2021.02.28
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Abstract

In modern society, various digital communication equipments are being used due to the influence of the 4th industrial revolution, and accordingly, interest in removing noise generated in the data transmission process is increasing. In this paper, we propose a filtering algorithm to remove AWGN generated during digital image transmission. The proposed algorithm removes noise based on mask matching to preserve information such as the boundary of an image, and uses pixel values with similar patterns according to the pattern of the input pixel value and the surrounding pixels for output calculation. To evaluate the proposed algorithm, we simulated with existing AWGN removal algorithms, and analyzed using enlarged image and PSNR comparison. The proposed algorithm has superior AWGN removal performance compared to the existing method, and is particularly effective in images with strong noise intensity of AWGN.

현대 사회는 4차 산업혁명의 영향에 의해 다양한 디지털 통신 장비가 사용되고 있으며, 이에 따라 데이터 전송 과정에서 발생하는 잡음 제거에 관심이 높아지고 있다. 본 논문에서는 디지털 이미지 전송 과정에서 발생하는 AWGN을 제거하기 필터링 알고리즘을 제안한다. 제안한 알고리즘은 영상의 경계선과 같은 정보를 보존하기 위해 마스크매칭에 기반하여 잡음을 제거하며, 입력 화소값과 주변 화소의 패턴에 따라 서로 유사한 패턴을 지닌 화소값들을 출력계산에 사용한다. 제안한 알고리즘을 평가하기 위해 기존 AWGN 제거 알고리즘들과 시뮬레이션하였으며, 확대영상과 PSNR 비교를 사용하여 분석하였다. 제안한 알고리즘은 기존 방법에 비해 AWGN 제거 성능이 우수하였으며, 특히 AWGN의 잡음 세기가 강한 영상에서 효과적인 모습을 보였다.

Keywords

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