한국산업정보학회논문지 (Journal of Korea Society of Industrial Information Systems)

한국산업정보학회 (Korea Society of Industrial Information Systems)
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선택적인 DCT 상수의 사용과 이미지압축 품질에 관한 연구

Research on Image Compression Quality and Limited Inclusion of DCT Coefficient

  • 문병현 (대구대학교 정보통신공학부)
  • 투고 : 2015.09.16
  • 심사 : 2015.10.29
  • 발행 : 2015.10.31
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초록

본 논문에서는 DCT 상수를 선택적으로 사용하는 무손실 이미지 압축시스템을 Lenna, Cameraman 및 제안하였다. 복원된 영상의 적정한 화질에 필요한 DCT 상수를 구하기 위하여 컴퓨터 시뮬레이션을 실시하였다. 실험에 사용된 영상의 크기는 $256{\times}256$ 이다. 제한적으로 선택된 DCT 상수를 사용하여 복원된 영상의 PSNR값을 도출하였다. 복원된 Lenna, Cameraman 및 Baboon 영상의 PSNR값이 최소 30이 되기 위한 상수의 개수는 각 각 N=16, 32, 37, 55로 주어졌다. 본 논문에서 구해진 결과는 Lenna, Cameraman, Baboon 영상 복원영상과 선택적 DCT 상수의 중요도를 결정하는 기준을 제공한다.

In this paper, the DCT based lossless image compression system which selects a limited number of DCT coefficients is proposed for the Lenna, Camerman, and Baboon image. The number of DCT coefficients to obtain a suitable image quality for the reconstructed image is computed by simulation. The image size of $256{\times}256$ are used in the experiment. The PSNR values for the reconstructed image by selecting limited number of DCT coefficients are found. It is shown that the minimun number of the coefficients for Lenna, Cameramen Baby and Babbo image to obtain PSNR=30 are N=16, 32, 37, 55, respectively. The result can provide the guideline of the importance of the DCT coefficient toward the compression for the tested image of the Lena, Cameraman, and Baboon.

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참고문헌

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