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- 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。
- 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。
- The phase of the reference watermark is shifted randomly in the 2DFT domain to obtain many embedding watermarks. 参考水印的相位在2DFT域中被任意地改变,从而得到不同的嵌入水印。
- 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.
- 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。
- 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。
- The simulation results show that with the proper threshold, the reference watermark can be used to detect the embedding watermark, but other embedding watermarks cannot. 仿真结果表明,选择恰当的判决门限,参考水印能正确地检测嵌入水印,而由参考水印生成的其它嵌入水印却不能实现水印检测。
- This algorithm realizes the public verification of watermark, and needs only one reference watermark for detecting embedding watermarks, which decreases the watermark storage. 因此,该算法实现水印的公开验证,同时只需存储一个参考水印就能检测多个嵌入水印,降低了水印存储信息量。
- 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。
- Because using the treble embedding watermarking algorithm, therefore it increase in robustness effectively. 由于采用三重水印嵌入算法,因而有效地提高了健壮性。
- 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。
- 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。
- This technology brought no impact on quality of the image and was appropriated for embedding watermarking into images with less color and for applications of fragile watermarking. 该数字水印技术不会对图像的质量造成任何影响,适用于向颜色数较少的图像中加入水印和易脆水印相关应用。
- 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。
- 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。
- Digital audio watermarking embedding algorithm based on auditory masking model is proposed, embedding watermarking by quantizing low-band coefficients of DCT transformation based on masking threshold. 摘要提出一种基于听觉掩蔽模型的音频数字水印算法,根据掩蔽阈值量化音频经DCT变换后的低频系数来嵌入水印。
- 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。
- Theoretical analysis indicates that error probability of detector is independent of image itself, but only relies on the length of embedding watermarks and embedding strength factor. 理论分析表明:检测器的误检测概率与图像本身无关,只取决于嵌入水印长度和嵌入强度因子。
- 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。