基于插值技术和多层折叠的可逆数据隐藏算法

现有的基于插值技术的可逆数据隐藏算法具有单层嵌入容量大的优点。然而，现有算法隐秘图像的视觉质量不是很好。针对此问题，提出了一种基于插值技术和多层折叠的可逆数据隐藏算法。该算法先对输入图像进行不重叠的2×2分块；然后对每个分块利用提出的图像插值算法生成大小为3×3的分块。为降低嵌入数据对插值像素的失真，先对待嵌入的秘密数据进行多层折叠编码；然后再嵌入到插值像素中。大量的实验结果表明，提出的算法不会出现像素溢出；与最新相似的算法相比，在相同的嵌入容量条件下，该算法具有更好的视觉质量。此外，提出的算法能抵抗直方图和RS隐写分析。

Reversible data hiding algorithm based on interpolation technology and multi-layer folding

Existing reversible data hiding algorithm based on interpolation technology has the advantages of large embedding capacity, but the visual quality of the watermarked image of existing algorithms is not very good. To solve this problem, a reversible data hiding algorithm based on interpolation technology and multi-layer folding is proposed. The proposed algorithm performs 2×2 non-overlapping blocks on the input image, and then uses the proposed image interpolation algorithm to generate 3×3 blocks. In order to reduce the distortion of the embedded data to the interpolated pixels, the secret data to be embedded is firstly multi-folded and encoded, and then embedded in the interpolated pixels. Experimental results show that the proposed algorithm will not have pixel overflow. Compared with similar algorithms, under the same embedding capacity, the proposed algorithm has better visual quality. In addition, the proposed algorithm is resistant to histogram and RS steganalysis.