본 논문은 MPEG 비디오를 위한 양자화된 차분 에너지 워터마킹(QDEW) 알고리즘을 제안한다. 이 알고리즘은 블록의 고주파 성분인 DCT 계수를 선택적으로 제거함으로써 워터마크를 삽입하는 방식이다. 특히 제안된 방벌은 기존의 차분 에너지 워터마킹(DEW)의 단순비교방식과 다르게 양자화단위로 에너지 크기를 비교함으로써 큰 범위의 에너지가 차이날 때 발생되는 다량의 주파수제거 문제를 해결하여 화질의 열화를 방지하고 삽입되는 워터마크의 중량을 증가시켰다. 그리고 DCT계수를 제거하는 것으로만 워터마크를 삽입할 수 있기 때문에 재인코딩 과정없이 MPEG스트림에서 직접 워터마크를 삽입할 수 입는 장점이 있다.
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