"Multi-Objective color image blind watermarking algorithm via 3D-QIM in the fusion domain"

"The traditional watermarking algorithms based on one-dimensional QIM suffer from limited robustness and poor real-time performance. To address these issues, this paper pro poses a novel fusion-domain blind watermarking algorithm for color images. Firstly, this paper proposes a Three-Dimensional Quantization Index Modulation (3D-QIM) for the first time, overcoming the limitation of traditional methods where 1D-QIM shifts lead to decoding errors in the extraction stage. Meanwhile, the put forward Multi-Channel Embedded & Extraction (MCEE) mechanism embeds 1-bit watermark information into the three channels of each imageblocks respectively, and achieves water mark reconstruction during the extraction stage through joint decision-making based on tri-channel coefficients, significantly enhancing the robustness of watermarking. Furthermore, based on the variation of Schur-domain coefficients and their spatial mapping, this paper proposes a fusion domain theory, which employs an approximate Schur decomposition in the spatial domain to replace complex transform-domain operations, thereby combining the high real-time efficiency of spatial-domain water marking with the strong robustness of transform-domain water marking. Simultaneously, the Two-dimensional logistic adjusted sine map (2D-LASM) algorithm is employed to encrypt the watermark image, further enhancing the security. Experimen tal results demonstrate that the proposed algorithm performs well in terms of invisibility, robustness, real-time, security and embedding capacity."