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

  • 제21권9호
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  • Pages.1689-1696
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  • 2017
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  • 2234-4772(pISSN)
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  • 2288-4165(eISSN)
한국정보통신학회 (The Korea Institute of Information and Commucation Engineering)
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표준편차 및 3차 스플라인 보간법을 이용한 영상 복원 알고리즘에 관한 연구

A Study on Image Restoration Algorithm using Standard Deviation and Cubic Spline Interpolation

  • Kwon, Se-Ik (Dept. of Control and Instrumentation Eng., Pukyong National University) ;
  • Kim, Nam-Ho (Dept. of Control and Instrumentation Eng., Pukyong National University)
  • 투고 : 2017.05.31
  • 심사 : 2017.06.23
  • 발행 : 2017.09.30
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초록

영상을 획득 또는 전송하는 과정에서 다양한 잡음에 의해 영상의 열화가 발생하고 있으며, 이러한 영상에 첨가되는 잡음을 제거하기 위한 연구가 공간 영역에서 활발하게 진행되고 있다. 본 논문에서는 영상에 첨가된 복합잡음을 제거하기 위해 잡음의 종류에 따라 처리하는 스위칭 필터를 제안하였다. 잡음 판단을 통해 국부 마스크의 중심화소가 AWGN에 훼손된 경우, 국부 마스크의 표준편차에 임계값을 적용하여 가중치 마스크의 가중치를 다르게 적용하여 처리하고, salt and pepper 잡음에 훼손된 경우, 국부 마스크를 네 방향으로 세분하여 각 방향의 salt and pepper 잡음이 가장 적은 방향에 대해 3차 스플라인 보간법을 적용하여 처리하는 알고리즘을 제안하였다. 그리고 제안한 필터 알고리즘의 성능을 평가하기 위해 PSNR을 사용하여 기존의 방법들과 제안한 필터 알고리즘을 각각 비교하였다.

In the process of obtaining and transmitting image, there is degradation of image due to various noise, and there have been many active studies ongoing to remove the noise added on the images. This thesis has proposed a switching filter processing by the types of noise in order to remove the complex noise added on images. When the center value of local mask is damaged by AWGN based on the noise judgment, the threshold value is applied on standard deviation of local mask to process by applying different weight of weighted mask, and if the image is damaged by the salt and pepper noise, the local mask is subdivided into 4 directions, and processed by applying cubic spine interpolation in the direction with the least slat and pepper noise. Also, in order to evaluate the performance of proposed filter algorithm, the study conducted comparison among the existing methods and proposed filter using PSNR.

키워드

참고문헌

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