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- And then we embed watermark data by modifying distribution of each division. 然后,透过调整区间中各个像素的分布来达到藏匿浮水印的工作。
- A security digital contract system in which hash and digital signature are used to embed watermark to a digital contract is implemented under a practical application. 本方案以在某企业的具体应用为背景实现了一套对电子合同进行散列、字签名,然后通过水印技术将信息隐藏入合同的安全电子合同系统。
- The watermark can be extracted by DCT on the audio signal embedded watermark. 提取水印时对含水印信号的音频信号也进行分段离散余弦变换;然后利用原始音频信号提取水印.
- Middle and middle-low subbands are chosen for watermark embedding.A selective embedding method is used to embed watermark into those coefficient blocks with clear block polarities. 浮水印嵌入时选择人耳较不敏感的偏低频系数作为嵌入之用,并且使用区块分类来过滤不适合嵌入浮水印的系数区块,将数位浮水印嵌入较不易改变极性之区块以确保浮水印的强韧性。
- The embedded watermark can resist time cropping, noise attack and normal audio transform algorithm. 嵌入的水印信号能够抵抗时域的切割、加噪攻击和一般的音频变换算法。
- At last, with this technology, the maximum capacity of embedding watermark into an index image was analyzed. 最后,分析了在索引图像中用该技术嵌入水印信息的最大容量。
- Quantization step of each coefficient is automatically computed in terms of the JND to adaptively embed watermarking. 在量化过程中,根据人眼视觉模型可见临界误差来确定每个系数的量化步长,实现了水印的自适应嵌入。
- So that, we propose a novel scheme to define the lattice structure of color space of host image for embedding watermark data. 也就是我们提出一个新的方案,定义原始影像彩色空间的晶状结构来藏匿浮水印的资料。
- A new watermarking technique based on HVS and error diffusion was introduced, which can embed watermarking in halftone image. 摘要介绍了一种基于HVS和误差扩散的半色调图像数字水印方法。
- Numerical experiments show that the embedded watermark is robust to signal manipulations, such as superposing noise, cropping and filtering. 对算法的测试结果表明:该水印算法具有很强的抗剪切、滤波攻击的能力,鲁棒性强。
- The experiment results show that the embedded watermark is inaudible, and has good robustness against kinds of attacks such as white noise, low-pass filtering and resampling. 实验结果证明所嵌入的水印具有很好的不可感知性,对加白噪声、低通滤波和重采样等各种攻击具有良好的鲁棒性。
- This paper addresses the issue of how to embed watermarks in ridgelet domain and proposes a novel adaptive and multiplicative watermarking algorithm based on ridgelet transform. 研究脊波变换域稳健性数字水印嵌入问题,提出一种新颖的自适应乘性数字水印嵌入算法。
- The experiment of embedding and attacking proves that the algorithm can guarantee the transparency and resist LSB attack.And the embedded watermark can be completely extracted. 通过嵌入水印后的图像效果和攻击实验证明,这种水印嵌入算法对心电图信号具有良好的视觉效果,可抵抗LSB攻击,鲁棒性强。
- Robust Analysis for Using LSB Arithmetic to Embed Watermark in Frequency Domain 使用频域LSB水印算法的鲁棒性分析
- This novel DCT-based approach has three keys, the doubly stochastic matrix along with its coefficients are used to embed watermarking and play the role of private keys, while summation of transformation matrix of watermarking serves as public key. 在水印的嵌入与检测过程中用到了 3个密钥 ,双随机矩阵和嵌入尺度作为秘密钥保证了水印嵌入的安全性 ,DCT系数矩阵之和则作为公开钥用于水印信息的部分认证 文中算法实现了将图像作为水印信息隐藏到载体图像中 ;
- Experiments showed when typical fingerprint image was compressed to 1/4~1/20 of its original size, the embedded watermark could be exactly extracted, and fingerprint recognition rate remained almost the same after lossy compression. 实验表明典型指纹图像压缩到1/4~1/20的时候,嵌入的水印能够无损提取,指纹图像虽不能完全恢复但识别率没有明显降低。
- The experimental results show that the proposed scheme works really well, the embedded watermark is effectively robust against various image processing operations such as cropping, rotation, flipping, scaling, JPEG lossy compression, etc. 实验证明,该算法的效果良好,稳健性强,植入的水印对剪裁、旋转、翻转、比例缩放和JPEG有损压缩都具有较强的免疫力。
- This paper brings forward a frangibility blind digital watermark algorithm based on mark strong watermark.It selects three luminance DCT coefficients at random,then embeds watermark information. 从基于标识性鲁棒水印出发,提出了一种脆弱性防篡改盲数字水印算法,即任意选择3个亮度DCT系数嵌入水印信息。
- Embedding process embeds watermark in approximation image of original image in wavelet domain,and the embedded intensity of watermark is determined adaptively by noise visibility function. 水印嵌入过程将水印嵌入在原始图像小波域的逼近子图,嵌入的强度由噪声可见性函数自适应决定。
- Experimental results show that embedded watermark is imperceptibility and robust to many attacks,such as noise adding,re-sampling,low pass filtering,re-quantization and lossy compression and so on. 实验结果表明,嵌入的水印不仅具有很好的透明性,而且对重新采样、低通滤波、添加噪声、重新量化、有损压缩等攻击也具有很好的鲁棒性。