High-capacity digital watermarking method combining multi-scale characteristics and Chinese remainder theorem

Abstract

The invention discloses a high-capacity digital watermarking method combining multi-scale characteristics and a Chinese remainder theorem, which is a high-capacity digital watermarking method used for covert communication and digital images. The method is used for determining positions for embedding and extracting watermarks by using multi-scale characteristic points with multiple-invariance, and embedding binary watermark images in a non-subsampled profile wave domain by using the Chinese remainder theorem. Before embedding, the watermark images are adjusted correspondingly according to an embedding region to ensure that watermark signals are adaptive to the embedding region. During extracting, a region containing watermarks is positioned by using a same method first, and the watermarks are extracted in the non-subsampled profile wave domain according to the Chinese remainder theorem. In the method, while high-capacity watermark signals are embedded, images containing the watermarks can obtain very high quality; and the extracted watermarks can resist conventional image processing operations and geometric transformations such as rotation, zooming, translation and the like, and the geometric transformations of the extracted watermarks and images are kept consistent for protecting the copyrights of the convert communication and the digital images.

Description

technical field [0001] The invention relates to a large-capacity digital watermarking method for covert communication and digital images, in particular to a large-capacity digital watermarking method combining multi-scale features and Chinese remainder theorem. Background technique [0002] The openness of the Internet has brought great convenience to people's lives. With the help of the network, people can easily realize data sharing. However, the openness of the Internet also brings a serious problem, that is, unauthorized multimedia products are arbitrarily uploaded to the network and downloaded without restriction, which seriously violates the legal rights of authors. How to effectively protect digital multimedia products has become an issue closely concerned by academic circles and industry circles. [0003] Digital image watermarking technology adds identification information to image data, and detects it as evidence when copyright disputes occur. In actual use, dig...

AI Technical Summary

Problems solved by technology

At present, most of the watermarking algorithms based on image features embed the watermark in the spatial domain, resulting in unsatisfactory watermark robustness; the capacity of the watermarking algorithm embedded in the transform domain is tens of bits, and the watermark capacity is low.

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