대한전자공학회:학술대회논문집 (Proceedings of the IEEK Conference)
- 대한전자공학회 2003년도 컴퓨터소사이어티 추계학술대회논문집
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- Pages.163-166
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- 2003
Order Statistics를 적용한 Patchwork의 성능 개선 분석
Performance Analysis of Order Statistics Patchwork
초록
In conventional patchwork, the difference of the mean values of two groups is compared for watermark detection. We propose two modified patchwork schemes based on order statistics, which achieves significant improvements over conventional patchwork. First, we propose that the mean comparison is replaced by the median comparison, to get PSNR improvement due to informed watermarking. Second, we propose a majority voting scheme of a sequential comparison of pixel pairs in a sorted order, which produces significantly lower BER. The performance improvements are mathematically analyzed and tested. In experimental results, PSNR is about 5㏈~10㏈ higher in the first method and BER is about 1/5~l/2 times lower in the second method than conventional patchwork.
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