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Reversible watermarking utilising weighted median-based prediction

机译:利用基于加权中位数的预测进行可逆水印

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Reversible digital watermarking techniques enable the recovery of the original `cover image?? from a watermarked image in a distortion-free way. Reversible watermarking techniques find application in military and medical imagery, where integrity of the cover image is of utmost importance. In this study, we propose a reversible digital image watermarking algorithm that predicts a pixel greyscale value exploiting its correlation with its neighbouring pixels, and embeds watermark bits into the prediction errors. Our algorithm succeeds in providing high embedding capacity with very low distortion, without `multilayer embedding??, hence reducing the computational burden compared with existing state-of-the-art algorithms. In addition, our results indicate that the resulting data overhead requirement is extremely low.
机译:可逆的数字水印技术可以恢复原始的“封面图像”。从水印图像中以无失真的方式进行。可逆水印技术可用于军事和医学图像,其中封面图像的完整性至关重要。在这项研究中,我们提出了一种可逆的数字图像水印算法,该算法利用与相邻像素的相关性来预测像素灰度值,并将水印位嵌入预测误差中。我们的算法成功地提供了具有非常低失真的高嵌入能力,而没有“多层嵌入”,因此与现有的最新算法相比,减少了计算负担。此外,我们的结果表明,由此产生的数据开销需求非常低。

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