一种改进的基于图像融合的数字水印算法

摘要

In order to achieve the copyright protection of digital image products, a new image fusion-based digital watermarking algorithm is built. It performs chaotic scrambling pre-treatment on fingerprint image, the encryption technology is also integrated to enhance the safety of the system. A new embedding algorithm is presented based on the characteristic of JPEG compression process, which remarkably improves the performance of the spatial domain algorithm in resisting JPEG compression. Statistical features of the fingerprint signal is processed, it avoids the exposure of the embedded position and enhances the robustness as well. The performance of the algorithm is attested by a series of subjective and objective evaluation as well as by some offensive experiments. Results derived from a large quantity of experiments prove that the digital watermarking algorithm in this work is able to embed and extract watermark efficiently from the carrier images and has a high functional value.%为实现对数字图像产品的版权保护,构建了一种新的基于图像融合的数字水印算法.对指纹图像进行混沌置乱预处理,结合加密技术,增强了系统的安全性.根据JPEG压缩过程的特征,提出了一种新的嵌入算法,显著地提高了空间域算法抗JPEG压缩的性能.对指纹信号统计特征进行处理,避免暴露嵌入位置,增强了鲁棒性.通过主观和客观的评价方法以及攻击实验,验证了算法的性能.大量的仿真实验结果表明,采用的数字水印算法能够高效地在载体图像中嵌入和提取水印信息,具有较高的实用价值.