【摘要】 在分析视觉系统特征的基础上提出了一种新型的Contourlet域分层数字水印技术。该方法利用视觉系统对不同区域、不同局部特征的噪声敏感性不同设置相应的区域水印权重和局部水印权重,将水印按照设置的分层权重嵌入到Contourlet分解后的方向子带中。利用所提出的新型多分辨率检测器,通过与传统水印方法比较表明,该方法具有较好的透明性和盲检测性;对于常见的压缩、中值滤波等图像处理攻击,该方法表现了很好的稳健性。更多还原

【Abstract】 A novel Contourlet domain hierarchical digital watermarking method,based on the properties of human visual system was proposed.First,region watermark weights and local watermark weights were appropriately set based on the noise sensitivity properties of human visual system to different regions and local features.Watermark was then embedded into decomposed detail subbands of discrete contourlet transform.A new multiresolution detector was proposed for watermark detection.Experimental results and comparisons with other techniques operating in the wavelet domain prove the effectiveness of the new algorithm,including superior imperceptibility,blind detection and robustness to common attacks such as image compression and median filtering.更多还原