A secure reversible color image watermarking scheme based on LBP,lagrange interpolation polynomial and weighted matrix

Multimedia Tools and Applications - Secure reversible watermarking schemes are essential for image authentication and tamper detection in medical, military and government applications. In this...     

Robust reversible watermarking scheme using Slantlet transform matrix

The need for a robust reversible watermarking method has recently attracted more attention. This paper presents a novel robust reversible watermarking scheme based on using the Slantlet transform matrix to transform small blocks of the original image and hiding the watermark bits by modifying the mean values of the carrier subbands. The problem of overflow/underflow has been avoided by using histogram modification process. Extensive experimental tests based on 100 general images and 100 medical images demonstrate the efficiency of the proposed scheme. The proposed scheme has robustness against different kinds of attacks and the results prove that it is completely reversible with improved capacity, robustness, and invisibility in comparison with the previous methods.     

Adaptive reversible image watermarking scheme

This paper presents an adaptive block sized reversible image watermarking scheme. A reversible watermarking approach recovers the original image from a watermarked image after extracting the embedded watermarks. Without loss of generality, the proposed scheme segments an image of size 2^N × 2^N adaptively to blocks of size 2^L × 2^L, where L starts from a user-defined number to 1, according to their block structures. If possible, the differences between central ordered pixel and other pixels in each block are enlarged to embed watermarks. The embedded quantity is determined by the largest difference in a block and watermarks are embedded into LSB bits of above differences. Experimental results show that the proposed adaptive block size scheme has higher capacity than conventional fixed block sized method.     

Difference-expansion based reversible and visible image watermarking scheme

Multimedia Tools and Applications - A reversible image watermarking scheme recovers the original cover image after extracting the embedded watermarks. A visible image watermarking scheme embeds...     

Geometrically invariant color image watermarking scheme using feature points

Geometric distortion is known as one of the most difficult attacks to resist. Geometric distortion desynchronizes the location of the watermark and hence causes incorrect watermark detection. In this paper,we propose a geometrically invariant digital watermarking method for color images. In order to synchronize the location for watermark insertion and detection,we use a multi-scale Harris-Laplace detector,by which feature points of a color image can be extracted that are invariant to geometric distortions. ...     

An improved color image watermarking scheme based on Schur decomposition

Multimedia Tools and Applications - With the rapid development of computer technology, the copyright protection of color image is becoming a more and more urgent problem. In this paper, an improved...     

基于LASSO的可逆图像水印算法

对于采用差值扩展-直方图平移的可逆水印算法,提高预测的准确度有利于减小预测误差,从而在同等嵌入失真时获得更大的嵌入容量。为了进一步提高图像像素预测的准确度,构造了一种基于LASSO （Least Absolute Shrinkage And Selection Operator）的局部预测算法。具体而言,根据图像存在边缘、纹理方向的特点,将图像像素预测问题表征为基于LASSO的优化问题;然后通过优化求解得到预测系数,进而得到预测误差;随后利用预测误差,结合差值扩展-直方图平移嵌入技术设计可逆图像水印算法。实验仿真结果表明,与当前预测性能较好的、基于最小二乘局部预测的可逆图像水印算法相比,所提算法在嵌入相同的数据时拥有更高的峰值信噪比（PSNR）。     

An IWT based blind and robust image watermarking scheme using secret key matrix

Multimedia Tools and Applications - In this paper, the authors have proposed a binary watermark embedding approach for protecting the copyright ownership of the gray-scale images. The proposed...     

基于几何校正的双树复小波域彩色图像水印算法

为了使图像水印算法拥有更好的鲁棒性和不可感知性,以双树复小波变换(DTCWT)为基础,提出了一种新的彩色图像盲水印算法。本算法将彩色图像颜色空间由RGB转换到YIQ,选取亮度分量Y进行双树复小波变换,得到低频子带,然后将加密后的水印信息嵌入到低频子带中。在水印提取过程中,使用了新颖的基于四元数PHT的最小二乘支持向量(LS-SVM)几何校正方法。实验结果表明,本算法具有更好的鲁棒性和不可感知性。     

A color image watermarking scheme based on artificial immune recognition system

This study suggests a novel watermarking technique that uses artificial immune recognition system to protect color image’s intellectual property rights. The watermark is embedded in the blue channel of a color image. m-bit binary sequence embedded into the color image is used to train artificial immune recognition system. With this composed technique, extracting the watermark which is embedded into the color image is carried out using artificial immune recognition system. It is observed that the composed technique achieves high performance to process of extracting this watermark. The watermark is extracted successfully from the watermarked image after various image processing attacks as well.     

基于HVS的多通道DCT彩色图像水印算法

提出了一种基于离散余弦变换(DCT)的彩色盲水印算法,首先将彩色图像由RGB彩色空间转换到YCbCr彩色空间,利用其良好的空间独立性,分别对三个空间进行DCT,并根据人眼视觉特性自适应选择嵌入量,嵌入水印.实验结果表明,嵌入算法容易实现,且该水印算法具有很好的不可见性,并对剪切和JPEG压缩等图像处理都有很好的鲁棒性.     

A majority-voting based watermarking scheme for color image tamper detection and recovery

This paper presents a novel color image watermarking scheme for both tamper detection and tampered image recovery. The proposed scheme embeds watermarks consisting of the authentication data and the recovery data into image blocks. In the tamper detection process, instead of independently examining each embedded authentication data, we take all the authentication data embedded in an image into account and utilize a majority-voting technique to determine the legitimacy of image blocks. Experimental results show that the proposed scheme can effectively thwart collage attack and vector quantization (VQ) attack, while sustaining superior accuracy of tamper localization. Furthermore, the results reveal that the tampered images can be successfully recovered with acceptable visual quality.     

Effective Color image watermarking scheme using YCbCr color space and QR code

Multimedia Tools and Applications - A digital image watermarking technique is proposed to hide the relevant information in color digital images. The image is converted from RGB color space to YCbCr...     

基于DWT-SVD域的彩色图像自适应水印算法

为了保护数字彩色图像版权,提出了一种结合离散小波变换(DWT)和矩阵奇异值分解(SVD)的彩色图像自适应水印算法。其主要设计思想是:先将原RGB彩色图像的各颜色分量进行小波分解;再将得到的中、低频带的小波系数与原水印图像分别进行奇异值分解,水印信息的奇异值重复嵌入到三通道中、低频带的小波系数奇异值中,且利用临界视觉阈值与奇异值之间的关系对水印嵌入强度作自适应调节,从而达到增强水印鲁棒性和确保水印透明性的目的。本算法适用于二值及灰度水印,在二值水印的提取过程中需设定一个提取阈值,以保证提取水印的完整性。仿真结果说明本算法对水印系统的透明性与鲁棒性作了较好的协调,是一种较稳健的算法。     

A novel color image watermarking scheme in nonsampled contourlet-domain

Geometric distortion is known as one of the most difficult attacks to resist, for it can desynchronize the location of the watermark and hence causes incorrect watermark detection. It is a challenging work to design a robust color image watermarking scheme against geometric distortions. Based on the support vector regression (SVR) and nonsubsampled contourlet transform (NSCT), we propose a new color image watermarking algorithm with good visual quality and reasonable resistance toward geometric distortions in this paper. Firstly, the geometrically invariant space is constructed by using color image normalization, and a significant region is obtained from the normalized color image by utilizing the invariant centroid theory. Then, the NSCT is performed on the green channel of the significant region. Finally, the digital watermark is embedded into host color image by modifying the low frequency NSCT coefficients, in which the HVS masking is used to control the watermark embedding strength. In watermark detection, according to the high correlation among different channels of the color image, the digital watermark can be recovered by using SVR technique. Experimental results show that the proposed color image watermarking is not only invisible and robust against common image processing operations such as filtering, noise adding, and JPEG compression etc., but also robust against the geometrical distortions.     

A robust watermarking scheme using self-reference image

In this paper, a robust watermark scheme for copyright protection is proposed. By modifying the original image in transform domain and embedding a watermark in the difference values between the original image and its reference image, the proposed scheme overcomes the weak robustness problem of embedding a watermark in the spatial domain. Besides, the watermark extraction does not require the original image so it is more practical in real application. The experimental results show that the proposed scheme provides not only good image quality, but is also robust against various attacks, such as JPEG lossy compression, filtering and noise addition.     

Adaptive interpolation and segmentation based reversible image watermarking

Multimedia Tools and Applications - Reversible image watermarking schemes are used to protect ownership and copyrights of digital images. This paper proposes a novel reversible image watermarking...     

基于多通道小波变换彩色图像公开数字水印技术

提出一种基于多通道及小波变换的彩色图像公开数字水印技术方案,该方案充分考虑彩色图像中人类视觉(HVS)的掩蔽特性,将彩色图像由RGB彩色空间转换到YCbCr彩色空间,利用YcbCr良好的空间独立性获取3个相对较为独立的颜色通道Y,Cb,Cr.对每个独立颜色通道中的宿主图像进行充分的内容信息挖掘,并计算其视觉阈值矩阵JND(just noticeabledifference).将宿主图像分块后在离散小波域内进行水印的嵌入.实验结果表明,该算法不仅具有较好的透明性,而且对诸如叠加噪声、JPEG压缩、几何剪切、图像增强、分色攻击等攻击性实验中均具有较好的鲁棒性.     

基于小波域SVD的彩色图像自适应水印方案

提出了一种针对彩色图像认证的半脆弱水印方案,彩色图像亮度信息通过线性变化处理后进行离散小波变换（DWT）,对低频子图分块后进行奇异值分解（SVD）,将置乱后的二值水印信息通过自适应量化嵌入到奇异值中实现内容认证。线性变化处理能改善由水印带来的对彩色图像明暗度的影响,同时利用一维Tent混沌的特性构成混沌二维置换网络,只需要一个初值,使算法更加简单。由实验结果表明该算法对JPEG压缩稳健,而对恶意操作敏感,同时水印提取是盲提取的。