Journal of Korea Multimedia Society (한국멀티미디어학회논문지)

Korea Multimedia Society (한국멀티미디어학회)
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Active Video Watermarking Technique for Infectious Information Hiding System

전염성 정보은닉 시스템을 위한 능동형 비디오 워터마킹 기법

  • 장봉주 (부경대학교 정보보호협동과정) ;
  • 이석환 (동명대학교 정보보호학과) ;
  • 권기룡 (부경대학교 IT융합응용공학과)
  • Received : 2012.02.23
  • Accepted : 2012.06.15
  • Published : 2012.08.31
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Abstract

Most watermarking schemes for video contents protection have been studied to increase watermark's robustness and invisibility against such compressions and many kinds of signal processing after embedding copyright information to the original contents. This paper proposes an active watermarking that infect watermark to contents in the video decoding process using embedded infectious watermark and control signals from a video encoder side. To achieve this algorithm, we design a kernel based watermarking in video encoder side that is possible to recover the original contents and watermark in watermark detection procedure perfectly. And then, by reversible de-watermarking in video decoder side, we design the active watermark infection method using detected watermark and control signal. This means that our system can provide secure re-distributions of video contents without any quality degration and watermark bit error against transcoding or re-encoding processing. By experimental results, we confirmed that the embedded watermark was infected by video contents and codec perfectly without any declines of compression ratio and video quality.

현재까지 대부분의 비디오 콘텐츠에 대한 워터마킹 기법들은 최초의 콘텐츠에 저작권자 정보를 은닉한 후, 압축율 및 각종 신호처리를 공격으로 간주하여 상대적인 강인성과 비가시성을 우수하게 설계하는 것으로서 연구되어왔다. 제안 기법은 워터마크와 제어신호를 전염성을 가진 정보로 간주하고 비디오 인코더에 은닉된 정보를 이용하여 디코더로부터 능동적으로 워터마크를 전염시키는 방법을 제안한다. 제안 기법을 위해 워터마크와 함께 화질제어 및 삽입강도 가변파라미터를 같이 은닉하는 커널 기반 워터마킹을 수행하며, 이것은 인증되지 않은 워터마크에 대해 저화질의 비디오 콘텐츠를 제공할 수 있는 장점을 가진다. 또한 비디오 디코더에서는 워터마크 복호화를 단계에서 저작권자나 사용자가 개입되지 않고 능동적으로 콘텐츠 기반의 워터마킹을 수행하여 변이된 워터마크를 전염시키는 기법으로 트랜스코딩, 재압축 등과 같은 처리에도 워터마크와 화질의 손상 없이 재배포가 가능하도록 한다. 실험결과 워터마크로 인한 압축율 저하나 워터마크의 손상 없이 비디오 콘텐츠와 코덱에 의해 완벽하게 전염됨을 확인하였다.

Keywords

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