Description: 一种基于多分辨率分解的图像水印嵌入方法
【摘 要】：根据小波变换的多分辨率的分析特征，提出了一种基于小波变换的水印嵌入方法，即在嵌入之前对水印做置乱处理，然后根据小波变换后的不同分辨率上的特点，将原始图像和水印进行小波分解，再将相同分辨率层次的数字水印分别嵌入其对应相同分辨率层次的原始图像中，使水印不可感知。试验结果表明，利用该方法较好的保持了图像的质量，并且对常用图像处理方法具有一定的健壮性，是一种行之有效的水印嵌入方法。-Based on multi-resolution decomposition of the image watermark embedding methods Abstract: Based on Wavelet Multi-resolution analysis of the characteristics of a wavelet-based watermark embedding method, that is, before the embedded watermark scrambling to do deal with, and then after the wavelet transform in accordance with a resolution on the different characteristics of the original image and watermark wavelet decomposition, and then the same resolution level of digital watermark embedding were the same as its corresponding original image resolution level so that the watermark can not be perceived. The experimental results show that the use of the method to maintain a good image quality, and commonly used image processing method has a certain degree of robustness, is an effective method of watermark embedding. Platform: |
Size: 362496 |
Author:绯村剑心 |
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Description: 基于人类视觉系统HVS的小波域数字图像水印
包含：嵌入、提取、分解、重构等-Based on human visual system HVS digital image watermarking in wavelet domain include: embedding, extraction, decomposition, reconstruction, etc. Platform: |
Size: 2048 |
Author:杜小三 |
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Description: ：针对动力学方程未知且信噪比小的光混沌信号，采用小波多分辨分解算法对其进行噪音消
减．用Lorenz混沌信号对该算法的消噪效果进行了检验．提出利用互信息量法和Cao氏法来改进
小数据量法在时间延迟和嵌入维数计算上存在的主观选择性，对经过噪音消减的Lorenz混沌信号
利用此改进的小数据量法计算其最大Lyapunov指数．结果表明，信噪比可提高近10 dB左右，最
大Lyapunov指数计算误差可减少近30 ，并求得半导体放大器光混沌信号的最大Lyapunov指
数为0．389 6．-The wavelet multi—resolution decomposition algorithm was used for reducing noise of optical
chaos signals with dynamic equation unknown and low SNR．The algorithm was verified by Lorenz chaotic
signa1．The mutual information algorithm and Cao method were used to reduce the suhj ective in computing
the delay time and embedding dimension when applying the small data method to compute the largest
Lyapunov exponent．The largest lyapunov exponent of the de—noised chaos signal was calculated with this
improved method．The result shows that the SNR is increased by about 1 0 dB，and the error of the largest
Lyapunov exponent is reduced by 30 ．The largest Lyapunov exponent of the optical chaos signal 0．389 6
is obtained with this method． Platform: |
Size: 389120 |
Author:王华 |
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Description: 提出了一种鲁棒的多水印嵌入与检测算法,该算法基于小波域,且提取水印时不需要原始图像,保护了原始图像的安
全。在该多水印算法中,提出并使用了一种将密码学和常规的数字水印制作方法- - - 叠加法和量化调制法,有机结合起
来的新的方法,在水印嵌入时,不同的水印,生成与该水印相关的不同的密钥,在进行水印的提取时,用不同的密钥和待测的
图像提取出相应的水印。通过将密钥向第三方注册,可以获得对原始图像的所有权。-A robust multi-watermark embedding and detection algorithm, the algorithm based on wavelet domain, and extract the watermark without the original image, protect the safety of the original image. In the multi-watermarking algorithm, will be presented and used a conventional cryptography and digital watermarking production method--- superposition method and quantify the modulation method, combine the new method, the watermark embedding different watermark, associated with the watermark generating different keys, making extraction of the watermark when tested with a different image key and the corresponding extracted watermark. By the key to a third party registration, can be obtained ownership of the original image. Platform: |
Size: 618496 |
Author:切尔西 |
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Description: 变换域加密图像数字水印算法研究
本文主要对图像数字水印算法进行了研究，主要利用离散小波变换实现数字水印的嵌
入和提取，这是因为小波变换可以将信号或图像进行多分辨率分解，具有放大、缩小和
平移的数学显微镜功能，利用小波分解的特性可以将水印信息嵌入到载体图像的不同区
域，更好地抵抗各种信号处理操作。-Transform domain encrypted image digital watermarking algorithm of this paper, the image watermarking algorithm using discrete wavelet transform digital watermark embedding and extraction This is because the wavelet transform signal or image multi-resolution decomposition, with zoom out and panning mathematical microscope function, using the characteristics of wavelet decomposition can watermark information is embedded into different regions of the image carrier, a better resistance to a variety of signal processing operation. Platform: |
Size: 6745088 |
Author:王 |
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Description: 本课题为基于MATLAB的小波变换dwt和离散余弦dct的多方法对比数字水印系统。带GUI交互界面。有一个主界面GUI，可以调用dwt方法的子界面和dct方法的子界面。流程包括，读取宿主图像和水印图像，嵌入，多种方法的攻击（剪切，加噪，旋转等），提取，最后利用psnr峰值信噪比进行评价不同攻击下，鲁棒性的好坏。(This topic is based on MATLAB wavelet transform DWT and discrete cosine DCT multi method comparison digital watermarking system. With GUI interface. There is a main interface GUI, which can call the sub interface of DWT method and DCT method. The process includes: reading host image and watermark image, embedding, attack of various methods (cutting, adding noise, rotation, etc.), extracting, and finally evaluating the robustness of different attacks by using PSNR peak signal-to-noise ratio.) Platform: |
Size: 32044032 |
Author:www.wobishe.com |
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Description: 本课题为基于MATLAB的小波变换dwt和离散余弦dct的多方法对比数字水印系统。带GUI交互界面。有一个主界面GUI，可以调用dwt方法的子界面和dct方法的子界面。流程包括，读取宿主图像和水印图像，嵌入，多种方法的攻击（剪切，加噪，旋转等），提取，最后利用psnr峰值信噪比进行评价不同攻击下，鲁棒性的好坏。(This project is based on MATLAB wavelet transform DWT and discrete cosine DCT multi method contrast digital watermarking system. With GUI interactive interface. There is a main interface GUI, which can call the sub interfaces of DWT method and DCT method. The process includes: reading host image and watermark image, embedding, attacks of various methods (cutting, adding noise, rotation, etc.), extracting. Finally, PSNR peak signal-to-noise ratio is used to evaluate the robustness of different attacks.) Platform: |
Size: 10000384 |
Author:MATLAB道长 |
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Search - embedding multi wavelet