CAJ | 학술논문

本文提出了一种基于共轭对称列率复数哈达码变换（CS-SCHT ）的鲁棒水印算法。在水印嵌入时，选择图像的CS-SCHT系数幅度作为水印载体，同时设计一种新的人眼视觉系统改善含水印图像的不可见性。检测时，运用Kolmogorov-Smirno方法估计系数幅度的近似分布。然后根据该分布构造局部最优检测器。实验表明该变换适合于水印领域，新检测器具有良好的鲁棒性，且人眼视觉系统能够改善含水印图像的视觉质量。
본문제출료일충기우공액대칭렬솔복수합체마변환（CS-SCHT ）적로봉수인산법。재수인감입시，선택도상적CS-SCHT계수폭도작위수인재체，동시설계일충신적인안시각계통개선함수인도상적불가견성。검측시，운용Kolmogorov-Smirno방법고계계수폭도적근사분포。연후근거해분포구조국부최우검측기。실험표명해변환괄합우수인영역，신검측기구유량호적로봉성，차인안시각계통능구개선함수인도상적시각질량。
A new robust watermarking algorithm based on conjugate symmetric sequency-ordered complex Hadamard trans-form (CS-SCHT ) is proposed in this paper .At the phase of embedding ,the magnitude of the CS-SCHT coefficients of host image is selected as support of watermark ,and a new human visual system is designed to improve the invisibility of marked image .Kol-mogorov-Smirno method is used to estimate the approximate distribution of the coefficients ’ magnitude ,and then a locally optimal detector is constructed based on the approximate distribution .Experimental results show that the CS-SCHT is suitable for watermark application ,and the proposed detector and human visual system can provide good performance .