基于HVS和DWT的半脆弱水印算法
首发时间:2010-04-01
摘要:在系统分析了人类视觉系统(HVS)的特性之后,本文提出了一种基于HVS和DWT的半脆弱水印算法。该算法充分利用了HVS的特性,在水印的嵌入过程中使用了原始图像的HVS掩蔽图像。在嵌入水印之前,首先对水印图像进行了Arnold置乱变换;再分别对宿主图像和宿主图像的HVS掩蔽图像进行DWT变换,然后根据水印序列来修正原始图像的小波系数,完成水印的嵌入。该算法能够自动判别含水印图片是否受到恶意攻击。实验结果表明,该算法对常用图片处理方法有非常好的鲁棒性,同时具有较好的恶意攻击检测与定位能力。
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Semi-fragile watermarking algorithm based on HVS and DWT
Abstract:In this paper, a semi-fragile watermarking algorithm based on Human Visual System(HVS) and Discrete Wavelet Transform (DWT) is presented. The proposed algorithm has taken full advantage of the HVS characteristics for the incorporation of HVS masking image in the watermark embedding process. Arnold transform was first applied to the binary watermark image to get a chaotic image of the watermark image. Then the wavelet coefficients of the original image were updated according to the watermark sequence and the wavelet coefficients of the HVS masking image. The proposed algorithm can automatically classify the type of changes on the watermarked image. Simulated experiments have demostrated that the proposed system is robust to content-preserving manipulations, but highly fragile to malicious changes on the watermarked image.
Keywords: Semi-fragile watermarking Human Visual System Discrete Wavelet Transform
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No.4145852367912701****
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