| 数字水印检测中剪裁图像的配准 |
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| 引用本文： | 严利民,储开颜,王朔中. 数字水印检测中剪裁图像的配准[J]. 上海大学学报(自然科学版), 2001, 7(2): 123-127 |
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| 作者姓名： | 严利民 储开颜 王朔中 |
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| 作者单位： | 上海大学通信与信息工程学院,;上海大学通信与信息工程学院,;上海大学通信与信息工程学院, |
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| 摘 要： | 围绕剪裁图像中数字水印的检测问题讨论剪裁参数的估计,利用离散Fourier变换的旋转不变性,通过对边缘图像DET沿不同方向的积分并采用差分相关技术,可准确估计剪裁图像的倾斜角,二维相关运算则给出剪裁图像在原图像中所处位置,从而将图像配准,实现可靠的水印检测。
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| 关 键 词： | 图像剪裁 图像配准 数字水印 |
| 文章编号： | 1007-2861(2001)02-0123-05 |
| 修稿时间： | 2000-08-30 |
Registration of Cropped Image for Watermark Detection |
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| YAN Li-min,CHU Kai-yan,WANG Shuo-zhong. Registration of Cropped Image for Watermark Detection[J]. Journal of Shanghai University(Natural Science), 2001, 7(2): 123-127 |
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| Authors: | YAN Li-min CHU Kai-yan WANG Shuo-zhong |
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| Abstract: | Aimed at detection of digital watermark from cropped images, a method for image registration is described. Based on the rotational invariant property of the Fourier transform, the DFT of Sobel edge is integrated along radials at different angles, and cross-correlation calculated between the difference sequences of the cropped and the original images. In this way, the tilting angle is calculated. The offset is then obtained by cross-correlating the cropped and tilt-corrected image with the original, making available the necessary parameters for watermark extraction. |
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| Keywords: | image cropping image registration digital watermarking |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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