한국통신학회논문지 (The Journal of Korean Institute of Communications and Information Sciences)

한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지

HVS 모델과 웨이블릿 변환을 이용한 블라인드 워터마킹

Blind Watermarking Using HVS and Wavelet Transform

  • 주상현 (한국전자통신연구원 디지털저작권관리연구팀) ;
  • 이선화 (한국전자통신연구원 디지털저작권관리연구팀)
  • 발행 : 2003.11.01
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초록

본 논문에서는 인간의 심리 시각적 특성을 고려한 HVS(Human Visual System) 모델과 웨이블릿 중간주파수 대역의 계수쌍을 이용한 블라인드 워터마킹 기법을 제안한다. 중간주파수 대역의 계수쌍은 각종 영상처리를 이용한 공격과 압축 공격 등에 대해서 비슷한 왜곡 현상을 보인다. 따라서 웨이블릿 계수를 일정한 크기로 양자화 하는 기존 방법들보다 중간주파수대역의 계수쌍 사이의 관계를 이용한 양자화 방법이 보다 안정적인 성능을 나타낸다. 또한 Noise Visibility Function(NVF)을 이용한 HVS 모델을 적용함으로써 워터마크 삽입 후의 비가시성을 확보하였다. 실험을 통하여 이진 워터마크를 삽입한 영상이 평균 44㏈ 이상의 우수한 화질을 유지하면서도 각종 영상처리 공격 및 JPEG 압축 공격에 대해서 견고성이 우수함을 확인하였다.

In this paper, we propose a blind watermarking that embeds watermarks into wavelet middle frequency subbands using human visual system. Wavelet middle frequency pairs(MFP) show similar distortion against general image processing attacks such as compression and filtering. So the quantization between MFPs is more robust than conventional methods that directly quantize DWT coefficients. We use a noise visibility function(NVF) to obtain a good visual quality This is able to preserve embedding positions after many attacks. Our experimental results show that the proposed scheme is robust to various image processing such as JPEG, while preserving good visual quality above 44㏈.

키워드

참고문헌

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