Image feature matching-based watermarking method and apparatus

Abstract

Embodiments of the invention provide an image feature matching-based watermarking method and apparatus. The method comprises the steps of acquiring an image file sample set of to-be-embedded watermarkinformation, and extracting line features of all image files in the image file sample set; determining a stable feature point set according to the line features of all the image files; after the watermark information is embedded by modifying stable feature points in the stable feature point set, obtaining a watermark image; and after the stable feature points in the watermark image are matched, extracting and identifying the embedded watermark information. According to the method, the watermark information is embedded by modifying the stable feature points, so that the embedding of the watermark information no longer depends on a watermark font library, and the implementation process is simpler; the watermark algorithm is better in robustness, can resist the attack of zooming and unequalresolution, and is widely suitable for identification of the watermark information in images shot by equipment such as a digital camera, a mobile phone or the like; and feature information-based imagematching is adopted, so that the calculation complexity of watermark information extraction and identification is lower.

Description

technical field [0001] The invention relates to the technical fields of document protection and image processing, in particular to a watermarking method and device based on image feature matching. Background technique [0002] In the era of big data, with the popularization of the Internet and the improvement of information management, the number of important documents in many enterprises and institutions is increasing, and they widely exist in electronic and paper media. Among them, paper documents can be disseminated in the form of printing, scanning, and copying; electronic documents can be copied and copied conveniently. Since the content of the document is easily obtained and tampered with illegally during the dissemination of document information, the protection of important documents is particularly important. Digital watermark technology plays an active role in the information security of documents. Some identifying information, such as document generation time, do...

AI Technical Summary

Problems solved by technology

[0007] Embodiments of the present invention provide a watermarking method and device based on image feature matching, which are used to solve the problems existing in the prior art, such as dependence on the watermark font library, high computational complexity in the watermark extraction process, poor visual effects of watermark characters, and watermark information Problems such as the relatively low accuracy rate of extraction and recognition

Images