Improved wavelet-based watermarking through pixel-wise masking
Improved wavelet-based watermarking through pixel-wise masking
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DOI：
10.1109/83.918570
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发表时间：
2001-05-01
影响因子：
10.6
通讯作者：
Piva, A
中科院分区：
文献类型：
--
作者：
Barni, M;Bartolini, F;Piva, A
提出了一种基于小波域的数字水印算法。通过一种新的方法来根据人类视觉系统(HVS)的特性来掩蔽水印，从而获得了相对于现有算法的性能改进。与在小波域中操作的传统方法不同，掩蔽是通过考虑所有图像子带的纹理和亮度内容来逐个像素地完成的。水印由自适应地添加到最大细节频带的伪随机序列组成。通常，水印是通过计算水印系数和水印编码之间的相关性来检测的，但检测阈值的选择不需要知道嵌入阶段使用的水印能量，从而允许它适应手边的图像。实验结果和与其他小波域算法的比较证明了新算法的有效性。
A watermarking algorithm operating in the wavelet domain is presented. Performance improvement with respect to existing algorithms is obtained by means of a new approach to mask the watermark according to the characteristics of the human visual system (HVS). In contrast to conventional methods operating in the wavelet domain, masking is accomplished pixel by pixel by taking into account the texture and the luminance content of all the image subbands. The watermark consists of a pseudorandom sequence which is adaptively added to the largest detail bands. As usual, the watermark is detected by computing the correlation between the watermarked coefficients and the watermarking code, anyway the detection threshold is chosen in such a way that the knowledge of the watermark energy used in the embedding phase is not needed, thus permitting to adapt it to the image at hand. Experimental results and comparisons with other techniques operating in the wavelet domain prove the effectiveness of the new algorithm.