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

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Mixed Noise Removal using Histogram and Pixel Information of Local Mask

히스토그램 및 국부 마스크의 화소 정보를 이용한 복합잡음 제거

  • Kwon, Se-Ik (Dept. of Control and Instrumentation Eng., Pukyong National University) ;
  • Kim, Nam-Ho (Dept. of Control and Instrumentation Eng., Pukyong National University)
  • Received : 2015.12.24
  • Accepted : 2016.01.29
  • Published : 2016.03.31
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Abstract

Recently, the data image processing has been applied to a variety of fields including broadcasting, communication, computer graphics, medicine, and so on. Generally, the image data may develop the noise during their transmission. Therefore, the studies have been actively conducted to remove the noise on the image. There are diverse types of noise on the image including salt and pepper noise, AWGN, and mixed noise. Hence, the filter algorithm for the image recovery was proposed that salt and pepper noise was processed by histogram and spatial weighted values after defining the noise to lessen the impact of mixed noise added in the image, and AWGN was processed by the pixel information of local mask establishing the weighted values in this study. Regarding the processed results by applying Lena images which were corrupted by salt and pepper noise(P=50%) and AWGN(${\sigma}=10$), suggested algorithm showed the improvement by 7.06[dB], 10.90[dB], 5.97[dB] respectively compared with the existing CWMF, A-TMF, AWMF.

최근, 디지털 영상처리는 방송, 통신, 컴퓨터 그래픽, 의학 분야 등에서 많이 응용되고 있으며, 일반적으로 영상 데이터는 전송하는 과정에서 잡음이 발생한다. 이에 따라 영상에 첨가되는 잡음을 제거하기 위한 연구가 활발히 진행되고 있다. 영상에 첨가되는 잡음에는 다양한 종류가 있으며, salt and pepper 잡음, AWGN, 복합잡음이 대표적이다. 따라서 본 논문에서는 영상에 첨가된 복합잡음의 영향을 완화하기 위하여 잡음 판단 후, salt and pepper 잡음은 히스토그램과 기존의 공간 가중치를 이용하여 처리하고, AWGN은 국부 마스크의 화소 정보를 이용하여 가중치를 설정하고 처리하는 영상복원 필터 알고리즘을 제안하였다. 제안한 알고리즘은 salt and pepper 잡음(P=50%) 및 AWGN(${\sigma}=10$)에 훼손된 Lena 영상을 적용하여 처리한 결과, 기존의 CWMF, A-TMF, AWMF에 비해 각각 7.06[dB], 10.90[dB], 5.97[dB] 개선되었다.

Keywords

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