基于离散小波变换的数字水印算法研究

Research Based on Digital Watermarking Algorithm of Discrete Wavelet Transform

数字水印技术就是将具有特定意义的水印,如图像、数字、随机序列等嵌入到媒体数字中以保护或认证产品。基于离散小波变换(DWT)的水印算法将原来的图像分割成很多频段图像,变换后的图像能够适应人眼的视觉特性并且使得水印的嵌入和检测可分为多个层次进行。为了在水印的不可察觉性和鲁棒性之间达到良好的折衷,选择中频子图来嵌入水印。仿真结果表明该算法具有较好的鲁棒性,能够抵抗常规的图像压缩和噪声等攻击。

Digital watermarking technology is the protection and authentication of this production through em-bedding specific meaning watermark, such as images, digital, random sequence in digital media. Based on the dis- crete wavelet transform（ DWT ） algorithm original image is divided into multiband which can be adapted to the characteristics of human vision and make the embedding and detection of the watermark can be divided into multi- ple. In order to make the best compromise between imperceptible and robustness, the watermarking is embedded in the mid-frequency sub-graph. The simulations reveal that the algorithm has better robustness and can resist attacks of image compression and noise.