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Hybrid method using HWT-DCT for image watermarking

机译：使用HWT-DCT进行图像水印的混合方法

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This paper proposed a hybrid method that had been solved both of these issues. We proposed a combination of Discrete Cosine Transform (DCT) and Haar Wavelet Transform (HWT) due to achieved imperceptibility and robustness comes from PSNR and NC value. Firstly, HWT applied in host image and then selected subband LL. LL subband will be divided into an 8×8 matrix in which each matrix was applied using DCT. Copyright embedded at the DC coefficient. In this paper we choose PSNR to measure the imperceptibility. Meanwhile, to measure the extracted copyright we used correlation coefficient. The results of this simulation method getting high PSNR value with an average of 43.2392 dB. Experiment results of extraction has tested using image watermarking attacks are JPEG compression, low pass filtering, mid filtering, unsharp filter, gaussian noise, cropingp, blurring, salt and pepper with the average value of the correlation coefficient of 0.8676. Our results proved that HWT-DCT has fulfilled the purpose of image watermarking, namely copyright protection.
机译：本文提出了一种混合方法，已经解决了这两个问题。我们提出了离散余弦变换（DCT）和哈尔小波变换（HWT）的组合，因为实现了不可感知性，并且鲁棒性来自PSNR和NC值。首先，HWT应用于主机图像，然后选择子带LL。 LL子带将被分成一个8×8矩阵，其中每个矩阵都使用DCT进行应用。版权嵌入DC系数。在本文中，我们选择PSNR来测量不可感知性。同时，为了测量提取的版权，我们使用了相关系数。该仿真方法的结果获得了较高的PSNR值，平均为43.2392 dB。使用图像水印攻击测试的提取实验结果是JPEG压缩，低通滤波，中间滤波，锐化滤波器，高斯噪声，裁剪，模糊，盐和胡椒，相关系数的平均值为0.8676。我们的结果证明，HWT-DCT已经实现了图像水印的目的，即版权保护。

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