The Journal of the Korea Contents Association (한국콘텐츠학회논문지)

The Korea Contents Association (한국콘텐츠학회)
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Coding Efficiency Improvement By Applying Rate-Distortion Optimization To 3D-DCT Based Integral Image Compression Method

3D-DCT 기반 집적영상 압축 방법의 율-왜곡 최적화를 통한 부호화 효율 향상 방법

  • 전주일 (충북대학교 전자정보대학 정보통신공학과) ;
  • 강현수 (충북대학교 전자정보대학 정보통신공학과)
  • Received : 2012.07.27
  • Accepted : 2012.08.21
  • Published : 2012.09.28
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Abstract

In this paper, we propose a rate-distortion optimization method to improve the coding efficiency of the conventional 3D-DCT based compression method using adaptive block mode selection for integral images. In the conventional 3D-DCT based compression method, 3D-DCT blocks of variable block sizes are adaptively selected depending on the characteristics of integral images, and then 3D-DCT is performed. The proposed method applies a rate-distortion optimization to determine the optimal block mode. In addition, we suggest the optimal Lagrangian parameter for integral images. Experimental results show that the proposed method gives bit-rate reduction of about 5%.

본 논문에서는 집적영상의 압축 방법 중에 하나인 적응적인 블록 모드 선택을 이용한 3D-DCT 기반의 압축 방법에 율-왜곡 최적화 방법을 적용하여 부호화 효율을 개선하는 방법을 제안한다. 적응적인 블록 모드 선택을 이용한 3D-DCT 기반의 압축 방법은 영상 특성에 따라 적응적으로 다양한 크기의 3D-DCT 블록을 구성한 후에 3D-DCT를 수행하는 방법이다. 제안 방법은 기존 방법에서 최적 블록 모드를 선택할 때, 율-왜곡 최적화 방법을 적용하여 부호화 효율을 개선하였다. 또한 실험을 통해 집적영상에 적합한 최적의 라그랑지 계수를 제시하였다. 제안 방법은 기존 방법과 비교해 약 5%의 비트량 절감 효과를 가진다.

Keywords

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