본 논문은 포토 프린터와 디지털 카메라에 의한 ‘프린트-캡춰’ 모델과 같은 D/A-A/D 변형에 강인한 디지털 영상 포렌식마킹 기술에 관한 연구이다. 디지털 카메라에 의한 프린트 출력 영상을 캡춰할때는 압축, 잡음, 기하학적 변형, 카메라 렌즈 왜곡과 같은 다양한 왜곡 요소들이 복합적으로 가해진다. 본 논문에서는 이러한 ‘프린트-캡춰’ 환경과 같은 D/A-A/D 변형된 영상으로부터 삽입된 포렌식마크 정보를 추출하는 방법을 검토하였다. 64비트의 사용자 ID 정보를 디지털 영상에 삽입하고 출력된 영상을 디지털 카메라로 다시 캡춰한 영상으로부터 삽입된 포렌식마크 신호를 추출하기 위해 다중 비트의 포렌식마크 신호를 타일 패턴으로 반복해서 영상에 삽입을 하였으며, 실험 결과 포렌식마킹된 영상의 출력물에서 디지털 카메라를 통한 포렌식마크의 추출이 성공적으로 이루어지는 것을 확인하였다.
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