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| 基于Shamir门限方案和DWT的图像盲水印算法 |
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陈青,司旭
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上海理工大学，上海 200093
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| 摘要: |
| 目的 为了提高数字水印的抗剪切等方面的鲁棒性和不可见性，提出一种基于Shamir门限方案和DWT的图像盲水印算法。方法 首先将水印图像利用Arnold变换进行加密处理，然后对置乱后水印图像用Shamir门限方案进行分存，接着将原始图像进行分块，并对每块分别做二层离散小波分解，提取出相应的低频系数，通过叠加的方法将分存过后得到的子水印图像分别嵌入相对应的原始图像分块的低频系数中，最后合成图像，完成水印的嵌入。结果 实验结果显示，文中算法的不可见性较好，峰值信噪比均在49 dB以上，结构相似性接近于1，并且在各种攻击下，水印NC始终大于0.9。结论 文中算法对于剪切、JPEG压缩和常见的噪声干扰等攻击表现出良好的鲁棒性，并且水印的提取过程无需用到原始图像，实现了水印的盲提取，在版权保护方面具有可行性。 |
| 关键词: Arnold变换 Shamir门限方案 水印分存 离散小波变换 |
| DOI：10.19554/j.cnki.1001-3563.2021.11.034 |
| 分类号:TP391.41 |
| 基金项目:上海理工大学国家级项目培育基金(16HJPY-MS06) |
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| Image Blind Watermarking Algorithm Based on Shamir Threshold Scheme and DWT |
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CHEN Qing, SI Xu
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(University of Shanghai for Science and Technology, Shanghai 200093, China)
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| Abstract: |
| The paper aims to improve the robustness and invisibility of the digital watermarking, image blind watermarking algorithm based on Shamir threshold scheme and DWT is proposed. Firstly, after Arnold transformation of the watermark image was stored with Shamir threshold scheme. Then, the original image was divided into blocks and decomposed into two levels of wavelet, the corresponding low frequency coefficients were extracted, and then the separated watermark was embedded into the low frequency coefficients of the corresponding original image blocks by overlay method. Finally, the synthesized image completed watermarking embedding. The experimental results show that the algorithm has good invisibility, PSNR is above 49 dB, SSIM is close to 1, and the NC value of extracted watermarking is higher than 0.9 under various attacks. The algorithm demonstrates good robustness to shear, JPEG compression and common noise jamming attacks. And the extraction of the watermark does not need the original image. The algorithm achieves the blind extraction of the watermark and has realistic feasibility in copyright protection. |
| Key words: Arnold transformation Shamir threshold scheme watermarking sharing discrete wavelet transform |
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