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.

中文翻译：

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5G环境下高安全性双色图像高效水印方案

高速率、广覆盖、大数据量的第五代无线通信技术（5G）对数字水印算法的运行时间、安全性和水印容量提出了新的要求。为实现5G环境下彩色图像的版权保护，提出一种融合Hadamard变换的双彩色图像空间数字水印方案。在该方案中，首先对受保护的彩色覆盖图像进行通道处理，然后将其划分为4×4不重叠的图像块。然后，直接在空间域中获取Hadamard域中图像块的最大能量系数，并通过量化该系数来隐藏水印信息。最后将改变后的特殊系数的量化变化量均匀分布到原始空间图像块的各个系数上，从而实现完整的水印隐藏过程。在提取阶段，在空间域中仅获取Hadamard域中水印图像的特殊系数，并分析系数阈值以确定水印信息的编码。该方案结合了空间域算法和频域算法的特点，设计了一套高安全性的加密方法，同时考虑了人类视觉系统对颜色的敏感性以及彩色图像通道的相关性。与其他方案相比，可以发现该方案具有优异的安全性和实时性，对常见攻击的鲁棒性强，图像质量高。