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학술대회 QIM Watermarking for Image with Two Adaptive Quantization Ste-sizes
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저자
서용석, 서영호, 오원근, 김원겸, 황치정
발행일
200702
출처
International Conference on Advanced Communication Technology (ICACT) 2007, pp.797-800
DOI
https://dx.doi.org/10.1109/ICACT.2007.358470
협약과제
07MC1300, 디지털콘텐츠 보호기술(DRM) 표준 개발, 오원근
초록
This paper proposes a QIM watermarkin -g scheme for a digital image with two adaptive quantization step-sizes. After calculating an edge map of the image, in a flat region a small step-size is applied and in an edge region a large step-size is used. The threshold between flat and edge is decided empirically and watermark blocks are embedded repeatedly into the image using different step-sizes. In the detection process, we show how to estimate the threshold value by ACF (Auto-Correlation Function).
KSP 제안 키워드
Edge map, QIM Watermarking, Small step, Step size, Threshold Value, adaptive quantization, auto-correlation function(ACF), detection process, digital image, flat region