摘要
数字水印技术在数字产品的版权保护、身份认证、隐蔽通信等领域受到广泛关注。针对长宽呈任意比例的图片,提出一种能够自适应图片尺寸的分块DCT图片水印算法。在满足水印嵌入最低图像尺寸要求的前提下,适合任意尺寸的载体图像。首先对载体图像进行小波分解,根据载体图像与水印图像的尺寸比例对低频分量进行分块,再选取分块中的8×8区域进行DCT变换。同时利用QR码在高数据量和高纠错率方面的优势,将水印信息进行QR编码作为水印图片。实验分析结果表明,算法在保证不可见性的前提下具有较好的鲁棒性和QR码的较高辨识率。
The Digital watermarking technology attracts widespread attention in recent years as an important means of digital products copyright protection , authentication , and covert communications .This article proposes a DCT block algorithm which adapts the images of random size . Get the wavelet decomposition of carrier image and divide its low-frequency component into blocks firstly .Make discrete cosine transform in the appropriate region .Then make the watermarking information into quick response code as the watermarking image .It takes the advantage of quick response code in high data volume and error correction rate .Experiments show that under the premise of invisibility ,the algorithm has good performance in robustness and the recognition rate of quick response code .
出处
《北京石油化工学院学报》
2014年第3期51-57,共7页
Journal of Beijing Institute of Petrochemical Technology
