Journal of the Institute of Electronics Engineers of Korea SP (대한전자공학회논문지SP)

The Institute of Electronics and Information Engineers (대한전자공학회)
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A two-layer watermarking method using inherent image structure

영상의 내재 구조를 이용한 2-계층 워터마킹 기법

  • 고윤호 (하이닉스반도체 System IC SBU SP BU) ;
  • 김성대 (한국과학기술원 전자전산학) ;
  • 최재각 (동의대학교 컴퓨터공학과)
  • Published : 2004.05.01
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Abstract

In this paper, we classify various attacks that may damage the embedded watermark signal into waveform attack and synchronization attack. And for the specialized defense against the two kinds of attacks we propose a new watermarking scheme named as two layer watermarking method. It consists of a synchronization layer to prepare for the geometrical attack such as rotation and shift and a marking layer 0 embed the watermark signal actually. Namely, the synchronization layer only determines the target region where the watermark signal will be embedded or extracted. And the marking layer spreads the watermark signal over the image as the conventional watermarking methods do. Using the layered structure, the proposed method overcomes the problem that the conventional watermarking methods that do not use the original image at the verification side are most vulnerable to geometrical attacks.

본 논문에서는 워터마크를 훼손할 수 있는 다양한 공격을 크게 파형 공격과 동기 공격으로 구분하고 두 부류의 공격에 대해 특화된 방어를 수행하기 위한 2-계층 워터마킹 기법을 제안한다. 제안된 방법은 동기 공격에 대한 방어를 위한 동기층(synchronization layer)과 일반적인 파형 공격에 대한 표시층(marking layer)의 2-계층으로 구성된다. 동기층에서는 다양한 공격에 대해서도 일정하게 선택되는 목표 영역을 선정하고, 표시층에서는 해당 영역에 대역-확산에 기반을 둔 방식으로 워터마크를 삽입한다. 이러한 2-계층 워터마킹 기법을 사용함으로써 기존의 원본 영상을 사용하지 않는 워터마킹 기법이 가지는 이동, 회전과 같은 기하학적인 공격에 보이는 문제점을 해결할 수 있게 된다.

Keywords

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