An efficient watermarking scheme for dual color image with high security in 5G environment.

The fifth-generation wireless telecommunication technology (5G) with high speed, wide coverage and large amount of data have posed new requirements for the running time, security, and watermark capacity of digital watermark algorithms. For realizing the copyright protection of color image in 5G environment, a spatial digital watermarking scheme for dual color image fusing Hadamard transform is proposed in this paper. In this scheme, the protected color cover image is firstly channeled and then divided into 4 × 4 non-overlapping image blocks. Then, the maximum energy coefficient of image block in the Hadamard domain is acquired directly in the spatial domain, and the watermark information is hidden by quantizing this coefficient. Finally, the changed quantization variation of the special coefficient are evenly distributed to each coefficient of the original spatial image block, so as to realize the complete process of hiding the watermark. In the extraction stage, only the special coefficient of the watermarked image in the Hadamard domain is obtained in the spatial domain, and the coefficient threshold is analyzed to determine the coding of watermark information. This scheme combines the characteristics of spatial domain algorithm and frequency domain algorithm, and designs a set of high security encryption method, at the same time, considers the human vision system to color sensitivity and the correlation of color image channel. Compared with other schemes, it can be found that this scheme has excellent security and real-time performance, strong robustness to common attacks, and high image quality. [ABSTRACT FROM AUTHOR]