基于像素预测和多MSB平面重排的加密图像可逆信息隐藏
Reversible data hiding in encrypted images based on pixel prediction and multi-MSB planes rearrangement
摘要：
随着云存储和隐私保护技术的发展，加密图像中的可逆数据隐藏技术（RDHEI）受到了广泛的关注。RDHEI是一种有效的图像加密后嵌入附加数据、无差错地提取附加数据和无损重建原始图像的技术。提出了一种基于像素预测和多MSB平面重排的大容量、完全可逆的RDHEI方法。首先，中值边缘检测器（MED）预测器用于计算预测值。接下来，与以前的方法不同，在我们提出的方法中，预测误差（PE）的符号由一个位平面表示，PE的绝对值由其他位平面表示。然后，我们将位平面划分为均匀块和非均匀块，并重新排列这些块。最后，根据不同的像素预测方案，自适应地嵌入不同数量的附加数据。实验结果表明，与现有的RDHEI方法相比，该方法具有更高的嵌入容量。
英文摘要：
Great concern has arisen in the field of reversible data hiding in encrypted images (RDHEI) due to the development of cloud storage and privacy protection. RDHEI is an effective technology that can embed additional data after image encryption, extract additional data error-free and reconstruct original images losslessly. In this paper, a high-capacity and fully reversible RDHEI method is proposed, which is based on pixel prediction and multi-MSB (most significant bit) planes rearrangement. First, the median edge detector (MED) predictor is used to calculate the predicted value. Next, unlike previous methods, in our proposed method, signs of prediction errors (PEs) are represented by one bit plane and absolute values of PEs are represented by other bit planes. Then, we divide bit planes into uniform blocks and non-uniform blocks, and rearrange these blocks. Finally, according to different pixel prediction schemes, different numbers of additional data are embedded adaptively. The experimental results prove that our method has higher embedding capacity compared with state-of-the-art RDHEI methods.
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