Reversible watermarking has extensive applications in fields such as medical data management and forensic enforcement. In this article, we propose a modified reverse zero-run length （RZL） coding method for reversibl...Reversible watermarking has extensive applications in fields such as medical data management and forensic enforcement. In this article, we propose a modified reverse zero-run length （RZL） coding method for reversible watermarking, which intro- duces fewer modifications to cover than previous ones under the same embedding rate. By combining the coding method with his- togram shift and quantization table modification strategy, we pro- pose a novel reversible data hiding algorithm for JPEG images. Compared with previous art, when embedding the same payload, our method has an improvement of at least 2 dB in stego image＇s quality, which proves the effectiveness and advantage of our algo- rithm.展开更多
在基于失真不可感知的控制模型(maximize payload under imperceptive,MPUI)下,研究了空域图像的最大水印容量。发现最大水印容量不仅与嵌入强度有关,而且与图像尺寸大小、复杂度、视觉敏感度等因素相关。在理论上推导了最大水印容量与...在基于失真不可感知的控制模型(maximize payload under imperceptive,MPUI)下,研究了空域图像的最大水印容量。发现最大水印容量不仅与嵌入强度有关,而且与图像尺寸大小、复杂度、视觉敏感度等因素相关。在理论上推导了最大水印容量与图像大小、嵌入强度的关系,并采用多元回归分析方法研究了图像复杂度、视觉敏感度与嵌入率的关系模型。综合这些内外因素,借助于主客观评价体系,推算出水印嵌入容量的估算方法,并在实验中验证了该估算方法的有效性。展开更多
基金Supported by the National Natural Science Foundation of China(61170234and60803155)the National Science and Technology Major Project of China(2010ZX03004-003)the High-Tech Research and Development Program of China(863program)(2009AA012201)
文摘Reversible watermarking has extensive applications in fields such as medical data management and forensic enforcement. In this article, we propose a modified reverse zero-run length （RZL） coding method for reversible watermarking, which intro- duces fewer modifications to cover than previous ones under the same embedding rate. By combining the coding method with his- togram shift and quantization table modification strategy, we pro- pose a novel reversible data hiding algorithm for JPEG images. Compared with previous art, when embedding the same payload, our method has an improvement of at least 2 dB in stego image＇s quality, which proves the effectiveness and advantage of our algo- rithm.
文摘在基于失真不可感知的控制模型(maximize payload under imperceptive,MPUI)下,研究了空域图像的最大水印容量。发现最大水印容量不仅与嵌入强度有关,而且与图像尺寸大小、复杂度、视觉敏感度等因素相关。在理论上推导了最大水印容量与图像大小、嵌入强度的关系,并采用多元回归分析方法研究了图像复杂度、视觉敏感度与嵌入率的关系模型。综合这些内外因素,借助于主客观评价体系,推算出水印嵌入容量的估算方法,并在实验中验证了该估算方法的有效性。
