반화소 움직임 벡터를 이용한 적응적 비디오 워터마킹 = Adaptive Video Watermarking Using Half-cell Motion Vector

국문 초록 (Abstract)

본 논문에서는 적응적 임계값과 반화소 움직임 벡터를 이용한 비디오 워터마킹 방법을 제안한다. 기존의 방법은 모든 매크로블록에 대해 워터마크 삽입 조건을 검색하고, 임의의 움직임 벡터에 워터마크가 삽입되므로 움직임 벡터 변경이 많고, 비가시성이 떨어진다. 제안한 방법은 를 이용하여 임계값을 생성하고, 임계값보다 큰 움직임 벡터에 워터마크를 삽입하므로 움직임 벡터 변경 횟수가 적고, 비가시성이 향상된다. 실험결과 제안한 방법은 비디오 비트스트림에 따라 평균 5.4 dB ～ 9.3 dB 의 비가시성 특성이 향상됨을 알 수 있었다.

다국어 초록 (Multilingual Abstract)

In this paper, I propose a video watermarking method using adaptive threshold value and half-cell motion vector. Conventional method cause a lot of change of motion vectors and bring about a falling-off in invisibility, because it search embedding condition about whole macroblocks and watermarks are embedded in arbitrary motion vectors. Proposed method improve invisibility and decrease in number of change of motion vectors, because it create threshold value by using power of motion vector(), and watermarks are embedded in motion vectors which greater than threshold value. Consequently, proposed method improve invisibility with on an average 5.4 dB ～ 9.3 dB according to video bit-stream

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