High-capacity reversible data hiding in encrypted images using double-label calculation and adaptive positioning technique

This paper proposes a novel reversible data hiding ($RDH$) method in encrypted images with high embedding capacity using double-label calculation and an adaptive positioning technique. The image owner encrypts the image by block permutation and stream cipher encryption. The data hider transforms each block into a binary matrix, enabling efficient data embedding while maintaining reversibility. The method introduces a double-label calculation technique for blocks with labels ranging from 0 to 3, significantly increasing embedding capacity. Additionally, the adaptive positioning technique enhances compression efficiency for sparse bit sequences. Experimental results demonstrate that the proposed method achieves superior embedding capacity compared to existing techniques while maintaining high security. The method ensures separate processes for data extraction and image recovery, making it suitable for applications requiring high data security and reversibility