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Multi-layer assignment steganography using graph-theoretic approach

机译：图论方法的多层分配隐写术

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摘要

This paper proposes a novel multibit assignment steganographic scheme for palette images, in which some colors in the palette are exploited to represent several secret bits. For the proposed scheme, each palette color is treated as a graph vertex, and an edge among any two vertices indicates an adjacent relationship between them. A graph traversal technique named depth-first search is used to accomplish the multibit assignment for the vertices that correspond to the palette colors. The major idea of the proposed data-embedding is to modify colors of image pixels according to the assigned bits and secret message. Image pixels are classified as embeddable pixels and non-embeddable pixels before data-embedding. During the data-embedding, for each embeddable pixel, if the original color of the pixel matches the secret data, the pixel is then kept unchanged; otherwise, a suitable adjacent color of the original color will be used to replace the original color so that the new color matches the secret data. Experimental results show that the secret data can be embedded and extracted successfully without introducing visual artifacts, and the proposed scheme can always achieve a high capacity or maintain good image quality, comparing with the related works.
机译：本文提出了一种新颖的调色板图像多位分配隐写方案，该方案利用调色板中的某些颜色来表示几个秘密位。对于所提出的方案，将每个调色板颜色视为图形顶点，并且任意两个顶点之间的边表示它们之间的相邻关系。使用一种称为深度优先搜索的图形遍历技术来完成与调色板颜色相对应的顶点的多位分配。提出的数据嵌入的主要思想是根据分配的位和秘密消息来修改图像像素的颜色。在数据嵌入之前，图像像素分为可嵌入像素和不可嵌入像素。在数据嵌入期间，对于每个可嵌入像素，如果像素的原始颜色与秘密数据匹配，则像素保持不变；否则，将使用原始颜色的合适相邻颜色替换原始颜色，以使新颜色与秘密数据匹配。实验结果表明，在不引入视觉伪影的情况下，可以成功地嵌入和提取秘密数据，并且与相关工作相比，该方案始终可以实现高容量或保持良好的图像质量。

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