Error diffusion halftone image watermarking based on SVD-DWT technique

Marzieh Amini, K. Yaghmaie, H. Sadreazami
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引用次数: 9

Abstract

In this paper, a new halftone image watermarking is presented based on digital wavelet transform combined with singular value decomposition technique. Halftoning is the process of representing grayscale images using just black and white i.e. binary levels. The original image is an error diffusion halftone image which is decomposed into 2-level wavelet transform. In the second level of wavelet transform, the subband with the midst variance intensity is selected as a place for inserting the watermark. The singular value decomposing is applied to this selected subband and watermark image. The embedding modification is done by combining singular value of selected subband with singular value of watermark image. In extraction process, detector response is computed to obtain the original watermark. Experimental results show good robustness against some common signal processing attacks.
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基于SVD-DWT技术的误差扩散半色调图像水印
本文提出了一种基于数字小波变换和奇异值分解技术的半色调图像水印方法。半色调是表示灰度图像的过程,只使用黑色和白色,即二值电平。原始图像是一幅误差扩散半色调图像,将其分解为二级小波变换。在小波变换的第二级,选择方差强度中等的子带作为水印插入的位置。对选取的子带和水印图像进行奇异值分解。将所选子带的奇异值与水印图像的奇异值相结合进行嵌入修改。在提取过程中,计算检测器响应,得到原始水印。实验结果表明,该算法对一些常见的信号处理攻击具有较好的鲁棒性。
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