基于图像块的数字水印算法

Digital watermarking Algorithm Based on Image Block

数字水印技术作为版权保护的重要手段,已得到广泛的研究和应用。本文提出了一种以二值图像作为水印的基于图像块的空域数字水印算法。为实现水印图像的叠加,首先将水印图像进行延拓预处理并利用混沌序列调制成二进制序列,然后对载体图像进行块操作,并对块内像素的灰度值求和后进行量化,最后将水印信息按不同量化幅值嵌入图像。实验结果证明,该算法具有较好的鲁棒性。

As a main method for copyright protection ,the technique of digital watermarking,has been widely studied and applied.In this paper,we proposes a digital watermarking algorithm based on image blocks in space domain with binary image,s watermark.In order to embed image,s watermark,we first extend the image,s watermark and change them into binary sequence by chaos sequence ,then split load-image into blocks and quantize the sum of gray of pixel in blocks,and finally the watermark components with different quantized strength are embedded into cover image.The experimental results show our algorithm has very remarkable robustness.