基于分形压缩编码的数字水印技术

THE WATERMARKING TECHNOLOGY BASED ON FRACTAL COMPRESSION

提出一种利用分形编码方案在图像中嵌入数字水印的方法。对数字图像分别进行传统分形编码和频域分形编码后 ,通过码书的比较 ,选择出一些R块 ,将这些块的编码方案更改 ,即用次优匹配D块替代最优匹配D块 ,从而实现数字水印的嵌入。实验证明该方案对图像质量几乎没有影响 ,在抗模糊、噪声干扰和剪切方面有较好的鲁棒性。

This article proposed a method of embedding watermarking into an image by using fractal compression scheme. For a digital image, we encoded it by using the traditional fractal coding and frequential fractal coding respectively. By comparing the codes, we selected some range blocks and modified their codes. That is to say, we watermarked images by taking the place of the first-matched domain blocks with the second-matched domain blocks of the code. Experimental results show that the proposed method degrades the image quality little and has good robustness to blurring, to noise disturbance and to cropping.