Digital watermarking technology, as a powerful tool for copyright protection and content authentication of multimedia works, has received increasing attention, and the current image watermarking technology has developed significantly. Generally, embedding a watermark is done in grayscale images, mainly due to the fact that grayscale images are easier to process than color images, and grayscale images only contain brightness information and color-free information, in which an embedded watermark will not produce new color components. In real life, however, color images are more common than grayscale image information. To improve the security of the watermark information and the ability to embed the location and improve the security of the algorithm against a variety of attacks, this paper proposes an algorithm based on quaternion Fourier transform (QFT) with chaotic encryption and Arnold scrambling. Geometric Algebra (GA) can process color images in the form of vectors, and each component of Red,Green and Blue (RGB) should be processed separately. We utilized quaternion (which is a subalgebra of GA) and effectively completed color image processing by utilizing Fourier transform. After utilizing QFT, each component was made more secure by scrambling the pixels of the watermark and performing encryption utilizing chaotic sequencing. Different types of results utilizing Mean Square Error (MSE),Peak Signal to Noise Ratio (PSNR),Structure Similiarity Index Metric (SSIM), etc. were computed to verify the performance of our proposed algorithm and show that the robustness and security are high by utilizing our method.

数字水印技术作为多媒体作品的版权保护和内容认证的有力工具，受到越来越多的关注，目前的图像水印技术已经有了长足的发展。通常，将水印嵌入灰度图像中，主要是因为灰度图像比彩色图像更易于处理，并且灰度图像仅包含亮度信息和无色信息，其中嵌入的水印不会产生新的颜色。组件。但是，在现实生活中，彩色图像比灰度图像信息更为普遍。为了提高水印信息的安全性和嵌入位置的能力，并提高算法针对各种攻击的安全性，提出了一种基于四元数傅立叶变换（QFT）的混沌加密和Arnold加扰算法。几何代数（GA）可以处理矢量形式的彩色图像，并且应分别处理红色，绿色和蓝色（RGB）的每个分量。我们利用四元数（它是GA的一个子代数），并通过利用傅里叶变换有效地完成了彩色图像处理。利用QFT之后，通过加扰水印的像素并利用混沌排序执行加密，可以使每个组件更安全。利用均方误差（MSE），峰值信噪比（PSNR），结构相似性指标（SSIM）等对不同类型的结果进行了计算，以验证我们提出的算法的性能，并表明鲁棒性和安全性很高利用我们的方法。