A New Image Watermarking Scheme Using Genetic Algorithm and Residual Numbers with Discrete Wavelet Transform

Transmission of data over the internet has become a critical issue as a result of the advancement in technology, since it is possible for pirates to steal the intellectual property of content owners. This paper presents a new digital watermarking scheme that combines some operators of the Genetic Algorithm (GA) and the Residue Number (RN) System (RNS) to perform encryption on an image, which is embedded into a cover image for the purposes of watermarking. Thus, an image watermarking scheme uses an encrypted image. The secret image is embedded in decomposed frames of the cover image achieved by applying a three-level Discrete Wavelet Transform (DWT). This is to ensure that the secret information is not exposed even when there is a successful attack on the cover information. Content creators can prove ownership of the multimedia content by unveiling the secret information in a court of law. The proposed scheme was tested with sample data using MATLAB2022 and the results of the simulation show a great deal of imperceptibility and robustness as compared to similar existing schemes.

A Triple-Channel Encrypted Hybrid Fusion Technique to Improve Security of Medical Images

Assuring medical images protection and robustness is a compulsory necessity nowadays.In this paper,a novel technique is proposed that fuses the wavelet-induced multi-resolution decomposition of the Discrete Wavelet Transform(DWT)with the energy compaction of the Discrete Wavelet Transform(DCT).The multi-level Encryption-based Hybrid Fusion Technique(EbhFT)aims to achieve great advances in terms of imperceptibility and security of medical images.A DWT disintegrated sub-band of a cover image is reformed simultaneously using the DCT transform.Afterwards,a 64-bit hex key is employed to encrypt the host image as well as participate in the second key creation process to encode the watermark.Lastly,a PN-sequence key is formed along with a supplementary key in the third layer of the EbHFT.Thus,the watermarked image is generated by enclosing both keys into DWT and DCT coefficients.The fusions ability of the proposed EbHFT technique makes the best use of the distinct privileges of using both DWT and DCT methods.In order to validate the proposed technique,a standard dataset of medical images is used.Simulation results show higher performance of the visual quality(i.e.,57.65)for the watermarked forms of all types of medical images.In addition,EbHFT robustness outperforms an existing scheme tested for the same dataset in terms of Normalized Correlation(NC).Finally,extra protection for digital images from against illegal replicating and unapproved tampering using the proposed technique.

HybridWatermarking and Encryption Techniques for Securing Medical Images

Securing medical data while transmission on the network is required because it is sensitive and life-dependent data.Many methods are used for protection,such as Steganography,Digital Signature,Cryptography,and Watermarking.This paper introduces a novel robust algorithm that combines discrete wavelet transform(DWT),discrete cosine transform(DCT),and singular value decomposition(SVD)digital image-watermarking algorithms.The host image is decomposed using a two-dimensional DWT(2D-DWT)to approximate low-frequency sub-bands in the embedding process.Then the sub-band low-high(LH)is decomposed using 2D-DWT to four new sub-bands.The resulting sub-band low-high(LH1)is decomposed using 2D-DWT to four new sub-bands.Two frequency bands,high-high(HH_(2))and high-low(HL_(2)),are transformed by DCT,and then the SVD is applied to the DCT coefficients.The strongest modified singular values(SVs)vary very little for most attacks,which is an important property of SVD watermarking.The two watermark images are encrypted using two layers of encryption,circular and chaotic encryption techniques,to increase security.The first encrypted watermark is embedded in the S component of the DCT components of the HL_(2)coefficients.The second encrypted watermark is embedded in the S component of the DCT components of the HH2 coefficients.The suggested technique has been tested against various attacks and proven to provide excellent stability and imperceptibility results.

A Robust Non-Blind Watermarking for Biomedical Images Based on Chaos

The advent of the Internet in these last years encouraged a considerable traffic of digital images. In the sanitary field, precisely in telemedicine branch, medical images play a very important role for therapeutic diagnoses. Thus, it is necessary to protect medical images data before transmission over the network to preserve their security and prevent unauthorized access. In this paper, a secure algorithm for biomedical images encryption scheme based on the combination of watermarking technique and chaotic function is proposed. In the proposed method, to achieve high security level performances, a non-blind hybrid watermarking technique with audio signal, Discrete Wavelet Transform is used;smoothness is also used as selected criteria;the iterations obtained by the chaotic sequences are essential and allow a good realization of the encryption process. One of the main advantages of chaos-based encryption schemes is the generation of a large number of key spaces to resist brute force attacks from the encryption algorithm. The experimental results presented in this paper attest to the invisibility and robustness of the proposed algorithm combining watermarking and chaos-based encryption.

A Novel Digital Image Watermarking Scheme on Copyright Protection Based on Network Manufacture Environment

In this paper,we propose a novel wavelet-domain digital image watermarking scheme on copyright protection based on network manufacture environment.It codes the watermarking with error correcting coding and encrypts the watermarking with chaotic encryption.It embeds the watermarking into the coefficients which have large absolute values in the middle-frequency parts got by Discrete Wavelet Transform (DWT) repeatedly.The extraction doesn’t need the original image.Experiment results show that the proposed scheme is easy to implement,and has good robustness to some attacks,such as JPEG compression,average filtering,median filtering,wiener filtering,pepper (?) salt noise,especially to cropping and scaling.In order to solve the prob- lem of the copyright protection of the network manufacture production,the problems of digital image production such as tamper preventing and watermarking attacks preventing and so on are discussed.It solves the problems of manufacture information such as secure exchange and transmissions and production copyright protection and so on.

数字技术支持下的海量图像信息多云存储平台设计

为降低海量图像的存储内存占用率,并保证图像的存储安全性,设计数字技术支持下的海量图像信息多云存储平台。该平台包括Google Cloud、Amazon S3、Microsoft Azure等多个云服务,形成多云架构;通过客户端控制高性能的本地服务器,实现本地服务器和企业云存储服务之间的云通信;本地应用模块利用数字水印技术加密海量图像信息后,结合小波变换算法压缩该图像后,通过该通信方式上传压缩加密后海量图像信息至多云存储架构中。测试结果显示,该平台数据流标准方差均在0.27以下,内存占用率在22.6%以下,多云服务器的负载均衡度结果均在94.1%以上,能够保证图像质量不会发生损坏。

离散小波变换和混沌结合的数字图像水印算法

提出了一种基于离散小波变换和混沌理论的数字图像水印算法。在水印嵌入过程中,首先对原始图像进行离散小波变换,提取其低频部分作为嵌入区域;然后利用混沌系统产生的混沌序列对水印进行加密,再将加密后的水印进行小波变换并提取其低频部分;最后将加密水印的低频部分嵌入到原始图像的低频部分中。水印提取过程需要原始载体图像,是一种明检测。通过水印相关系数NC和峰值信噪比PSNR评价水印算法性能。实验结果表明,提出的算法可以抵抗JPEG压缩、噪声、滤波等攻击,图像水印效果很好。

基于置乱和混沌加密的数字图像水印技术研究

为了进一步增加水印系统的安全性,对经过置乱变换的二值数字图像水印用时空混沌技术进行加密,使攻击者无法解读嵌入的水印.

基于混沌加密的彩色图像盲数字水印算法

针对单一混沌加密算法安全性较差的问题,提出一种基于扰动的二维混沌加密算法,利用二维Chebyshev映射和m-序列扰动作为混沌发生器,用于加密水印图像。将彩色载体图像绿色分量进行3级小波变换,提取其低频部分作为嵌入区域。将加密后的水印嵌入绿色分量的低频部分。实验结果表明,该算法计算速度较快,可以抵抗JPEG压缩、噪声、滤波等攻击,具有较好的数字水印特性。

变换域加密全息水印算法

提出了一种基于DCT-DWT的彩色图像全息水印算法。为了保证水印信息的安全性,该算法首先对水印信息进行双随机相位调制,并生成水印全息图;其次,将载体图像在Lab空间内的L分量进行4×4分块,对每一分块进行DCT变换,抽取每个矩阵的中低频系数,组成一个新的矩阵,并对之进行小波分解,将水印全息图嵌入到它的中低频小波系数上。实验结果表明,基于DCT-DWT变换的水印算法具有较好的不可见性,对常见的攻击具有强鲁棒性。

基于DWT-SVD和Turbo码的彩色图像盲水印算法

为进一步提高数字水印系统的性能,提出一种离散小波变换域中基于奇异值分解和Turbo纠错码的彩色图像盲水印算法.首先对数字水印进行混沌加密预处理,然后进行Turbo编码,再把编码后的水印信息嵌入到彩色图像蓝色分量小波分解后低频子带的奇异值矩阵中.提取水印时不需原始载体图像的参与,更便于实际应用.仿真实验结果表明,该水印算法不可见性较好,且对常见攻击和几何攻击具有较好的稳健性.

基于CMYK颜色空间的光全息水印算法研究

在印刷CMYK颜色空间、傅里叶全息加密和数字水印理论的基础上,提出了基于CMYK颜色空间的光全息水印算法。该算法不用转换颜色空间,避免了未印刷就人为导致水印信息的丢失,提高了重建水印的相似度;解密时,由于傅里叶变换的特性,重建水印的共轭图像与原水印图像互相叠加,增强了重建水印的清晰度。实验结果表明,该算法有较好的不可见性和较强鲁棒性,可以抵抗一般图像处理等操作。

基于公钥和脆弱水印的图像认证算法

本文提出一种基于公钥和小波域脆弱水印的图像完整性认证的算法。该算法不但能够检测和定位窜改,而且能同时验证图像的所有权。该水印方案为盲水印,检测过程不需要原始图像和附加信息。由于该认证算法建立在密码学方法的基础上,因此它是单向、不可逆的,未授权者很难伪造或修改原有的水印。文中分析了针对逐块独立的一类水印算法的"矢量量化攻击",提出了认证链等对抗措施。理论分析和实验结果表明,本文算法具有较好的性质和较高的安全性。

基于混沌加密和SVD的数字图像水印算法

为提高传统数字图像水印算法的安全性,提出一种基于混沌加密和奇异值分解的水印算法。采用Chebyshev混沌映射产生的混沌序列加密水印图像,将加密后的水印图像与原始图像进行分块,再对每一块进行奇异值分解,从而实现水印的嵌入。仿真实验结果证明,该算法对JPEG压缩、高斯噪声、椒盐噪声、滤波等具有较高的鲁棒性,同时能较好地抵抗剪切攻击。

基于超混沌和小波变换的鲁棒性数字水印算法

提出一种基于二维超混沌序列和离散小波变换(DW T)相结合的鲁棒性数字水印算法.该算法利用形式简单的二维离散超混沌系统产生的超混沌序列生成密码对水印图像加密,同时根据人类视觉系统的特性,对宿主图像在Y IQ色彩空间中的Y分量进行多级离散小波变换后,将加密后的水印图像嵌入到宿主图像Y分量的DW T中频子带中.实验结果表明算法同时具有良好的鲁棒性和不可见性.

基于多描述编码和小波变换的数字图像水印算法

为保证数字图像水印的鲁棒性、安全性以及嵌入容量,结合加密技术与图像压缩编码技术,提出了一种基于多描述编码和小波变换的加密数字水印技术.该技术采用密钥1对需要隐藏的水印图像进行多描述编码,并将编码转换为格雷码,然后将宿主图像色彩分量变换为差值图像,最后在频域内采用密钥2进行小波变换,以交互块跳频的方式完成水印信息的嵌入.理论分析和仿真实验均表明,这种数字水印技术有较大的嵌入容量,同时对常见的图像处理操作具有较强的鲁棒性,能够提高水印的安全性及抗剪裁攻击性能.

基于离散小波变换和混沌加密的图像水印算法

文中提出了一种基于离散小波变换和混沌加密的数字水印新算法,采用二维混沌变换对水印图像加密;对载体图像进行多分辨离散小波变换,应用小波系数判断载体图像的纹理复杂程度后,依据人眼的视觉系统(HVS)特性,将水印信号嵌入到图像的低频部分,对图像的不同分解层分别选取不同的纹理阈值和水印嵌入强度,将数字水印嵌入到相同分辨层的原始图像中,提高了水印算法的鲁棒性。在检测和提取水印时,通过水印相似度(NC)和峰值信噪比(PNSR)评价水印质量,实验结果表明提出的算法可以抵抗剪裁、JPEG压缩、滤波等几何攻击,算法简单,计算复杂度小,兼顾了水印的不可见性和鲁棒性。

基于人类视觉系统和离散小波变换的彩色图像水印

为了扩大数字水印的适用范围,提出一种基于人类视觉系统(HVS)和离散小波变换(DWT)的彩色图像数字水印算法。首先利用混沌加密算法把一个有意义的二值图像加密成水印;然后将彩色图像从RGB色彩空间转换到YCbCr空间,提取Y分量,对Y分量进行一级离散小波变换;最后求出低频分量LL1的视觉掩蔽值,根据视觉掩蔽值,将水印嵌入到彩色图像的Y分量的低频小波系数域上。实验结果表明,该算法具有较好的不可见性和鲁棒性。与以往的基于YCbCr颜色空间的算法相比,该算法具有更好的不可见性和鲁棒性。

基于超混沌和小波变换的鲁棒性水印算法

提出了一种基于连续超混沌系统和离散小波变换(DWT)相结合的鲁棒性数字水印算法。该算法利用连续超混沌系统产生的超混沌序列生成密码对水印图像加密,同时根据人类视觉系统(HVS)的特性,对宿主图像在YIQ色彩空间中的Y分量进行多级离散小波变换后,将加密后的水印图像嵌入到宿主图像Y分量的DWT中频子带中。实验结果表明算法同时具有良好的鲁棒性和不可见性。

彩色数字图像的脆弱数字水印

针对彩色数字图像局部区域内容保护和认证,研究了彩色数字图像的脆弱数字水印。为了保证水印的安全性,利用三维二值混沌序列对原始二值水印图像进行加密,对提取的加密二值水印图像进行解密。嵌入载体图像的水印和从嵌入水印的图像中提取的水印均是加密水印。将彩色数字图像中被保护区域的三个分量的小波变换域分别嵌入加密水印,以保护其内容的完整性和不可篡改性。采用模运算实现水印的嵌入和盲提取。理论分析和实验结果表明,该脆弱水印算法对彩色数字图像保护区域内的任何篡改,都能够正确地检测和定位。