张艳, 刘兵. 抗旋转的数字图像水印算法[J]. 云南大学学报(自然科学版), 2005, 27(1): 22-25,29.
引用本文: 张艳, 刘兵. 抗旋转的数字图像水印算法[J]. 云南大学学报(自然科学版), 2005, 27(1): 22-25,29.
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ZHANG Yan, LIU Bing. An arithmetic of digital watermark resistant to image rotation[J]. Journal of Yunnan University: Natural Sciences Edition, 2005, 27(1): 22-25,29.
Citation: ZHANG Yan, LIU Bing. An arithmetic of digital watermark resistant to image rotation[J]. Journal of Yunnan University: Natural Sciences Edition, 2005, 27(1): 22-25,29.
shu

抗旋转的数字图像水印算法

An arithmetic of digital watermark resistant to image rotation

    摘要
  • 摘要: 提出1种在载体图像发生旋转后仍可以正确检测的数字水印算法.该方法将水印序列排列成圆环状,嵌入在图像频谱的中频区域,利用Fourier变换的旋转性质,将图像的旋转转化为水印序列的平移,并利用随机序列的互协方差函数的峰值位置检测出平移尺度,从而正确提取水印.

     

    Abstract: A digital watermarking algorithm that is robust to rotation is proposed.Watermark sequence is arranged as a circular ring and embedded in the middle region of the image’s frequency spectrum.Using the rotation feature of Fourier transform,the algorithm turn image rotation into watermark sequence translation,and detect the translation scale using the translation character of the cross-correlation function of random sequences.Then the watermark is extracted.

     

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