차이값 히스토그램 기반 가역 워터마킹의 행열 교차 스캐닝을 통한 성능 향상 기법
Performance Enhancement through Row-Column Cross Scanning in Differential Histogram-based Reversible Watermarking
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초록
가역 워터마킹 기법은 디지털 콘텐츠에 지각적 투명성을 유지하며 워터마크를 삽입한 후, 이를 아무런 손상없이 원본 상태로 복원할 수 있는 메시지 은닉 수단으로서 높은 품질과 높은 삽입용량이 요구되는 분야에서 다양하게 이용되어질 수 있다. 본 논문에서는 차이값 히스토그램 기반의 가역 워터마킹에서 응용분야의 요구에 맞게 높은 삽입용량을 제공하기 위한 효율적인 반복삽입 알고리즘을 제안한다. 제안한 방법에서는 메시지가 삽입된 영상에 대하여 반복삽입할 때, 지역성을 최대한 활용하기 위하여 행열 교차 스캐닝 방법을 이용하였다. 다양한 영상들에 대하여 비교 분석한 실험 결과에 따르면 제안한 알고리즘은 완전한 가역성과 함께 낮은 왜곡을 유지하면서도 효율적인 반복삽입을 통한 높은 삽입용량을 얻을 수 있었다.
Abstract
Reversible watermarking inserts watermark into digital media in such a way that visual transparency is preserved, which enables the restoration of the original media from the watermarked one without any loss of media quality. It has various applications, where high capacity and high visual quality are major requirements. This paper presents a new effective multi-round embedding scheme for the differential histogram-based reversible watermarking that satisfies high capacity requirements of the application. The proposed technique exploits the row-column cross scanning to fully utilize the locality of images when multi-round embedding phase to the message inserted image. Through experiments using multiple kinds of test images, we prove that the presented algorithm provides 100% reversibility, effectiveness of multi-round embedding, and higher visual quality, while maintaining the induced-distortion low.
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