Image watermark embedding and extraction method based on swt-dft

Abstract

An image watermark embedding method based on SWT-DFT provided by this application includes: acquiring image data of a medical image; performing SWT transformation and DFT transformation on the medical image, and finally obtaining a characteristic binary sequence of the medical image; The sequence and chaotic scrambled watermarks are XORed bit by bit to insert binary text images into medical images as watermarks, and obtain the logical key for watermark extraction. This algorithm is based on SWT and DFT, taking into account the advantages of SWT's time-shift invariance and the characteristics of DFT's strong anti-conventional attack capability, ergodicity, robustness, etc., to extract features from medical images. It solves the defects of the original image data modification caused by the traditional watermark embedding technology, and ensures the quality of the medical image. The present application also provides an image watermark extraction method, an image watermark embedding system, a computer-readable storage medium and a terminal, which have the above beneficial effects.

Description

technical field [0001] This application relates to the field of image processing, in particular to a SWT-DFT-based image watermark embedding and extraction method and related devices. Background technique [0002] The development of medicine is gradually changing from traditional medicine to telemedicine, which makes a large number of medical images transmitted and shared in the network; in order to solve the problems that medical images may be tampered with and stolen during the transmission and sharing process, it is necessary to process the original medical images; The combination of zero watermark technology and perceptual hash technology, as a security technology for information security, can not only ensure safe transmission, but also realize information authentication, which is very important in practical applications. [0003] Digital watermarking technology was originally used for copyright protection of digital media. Now, using the invisibility and robustness of d...

AI Technical Summary

Problems solved by technology

[0004] At present, there are few researches on digital watermarking algorithms for medical images, and there are even fewer research results on zero-watermarking algorithms for medical data resistant to geometric attacks.

In the future, there will be a large number of medical data transmission problems, so it is of great significance to study how to embed digital robust watermarks in medical data, and for medical data, it is generally not allowed to modify its content

This further increases the difficulty of embedding watermarks in medical data

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