Multiple Color Medical Images Zero-Watermark Scheme Based on Quaternion Generalized Fourier Descriptor and QR Code.

Most of the existing zero-watermark algorithms for medical images are only applicable to grayscale images, and when they protect the copyright of a large number of medical images, the repetitive operation will bring a lot of time and storage costs. Therefore, to solve the above problems, this paper proposes a zero-watermark scheme for multiple color medical images based on quaternion generalized Fourier descriptor(QGFD) and QR code. QGFD is used to calculate the feature invariants of each color medical image, then the representative features of each image are selected to form the feature matrix, and binarize it to get the binary feature image, finally, the zero-watermark image can be obtained by performing an XOR operation on the scrambled copyright image and feature image. The experimental results show that the proposed scheme can not only effectively resist common attacks, geometric attacks and joint attacks, but also can effectively reduce the time and storage cost of copyright protection for a large number of medical images.