대부분의 워터마킹 기법은 공격에 대한 강인성과 비가시성을 통시에 만족시키기 위하여 중간주파수 영역에 워터마크를 삽입하는데 반해, 본 논문에서는 웨이블릿 분해된 영상의 저주파영역에 워터마크열, (-1, +1), 을 비가시적으로 삽입하는 블라인드 워터마킹 기법을 소개한다. 워터마크를 삽입하는 위치는 키에 의해 랜덤하게 선택되며, 화진열화를 크게 일으키는 계수에 대해서는 워터마크 삽입을 생략한다. 본 방식은 추출된 비터마크열의 상관도 계산에 의해 워터마크의 유무를 판정하므로 워터마크열의 일부가 삽입되지 않더라도 워터마크의 판정에는 무리가 없음을 보인다. 제안하는 방식의 성능은 ChechMark [1]의 벤치마킹 툴을 통하여 검증하였으며 [1]에 등록되어 있는 다른 방식들과 비교하였다.
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