A method and device for reversible clear watermarking based on vector graphics compression

A technology of vector graphics and watermarking, applied in image data processing, image data processing, instruments, etc., to achieve the effect of increasing aesthetics, saving storage space and reducing distortion

Active Publication Date: 2021-11-16
PEKING UNIV
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Problems solved by technology

[0005] The present invention mainly aims at the dependence of the original clear watermark image on the removal of the clear watermark image and the distortion-free restoration process of the original host image carrier in the current reversible clear watermark algorithm, and proposes to use the traditional reversible concealment algorithm to embed the compressed clear watermark image data into the non-obvious Watermark area, used to assist the process of reversible clear watermarking

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  • A method and device for reversible clear watermarking based on vector graphics compression
  • A method and device for reversible clear watermarking based on vector graphics compression
  • A method and device for reversible clear watermarking based on vector graphics compression

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Embodiment Construction

[0031] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below through specific embodiments and accompanying drawings.

[0032] In order to realize semi-blind reversible bright watermark embedding and removal, this embodiment provides a reversible bright watermarking method based on vector graphics compression. The specific steps of the overall process are as follows:

[0033] 1. After the original clear watermark image is subjected to vector graphics compression processing, a simplified set of graphic contour curve points Г is obtained.

[0034] First, the watermark image is vectorized to obtain a discrete set of graphic contour curve points Г'={P 1 ,P 2 ,P 3 ,...,P n}, and then the curve point set Г′ is subjected to vector curve compression to obtain the optimally approximated contour curve Г, where the watermark image is as figure 1 as shown, figure 2 for...

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Abstract

The invention proposes a reversible clear watermarking method and device based on vector graphics compression. The present invention obtains a set of discrete graphic outline curve points by vectorizing the clear watermark image, and then saves it to the non-clear watermark image area in the host image after vector graphics compression, which is used to assist the embedding and removal of the clear watermark image , thereby reducing the dependence on the original clear watermark image in the process of reversible clear watermark processing, and then solving the problems of low compression efficiency of clear watermark images, large distortion of carrier image modification, and poor embedding effect of clear watermark images. The invention also realizes the translucent three-dimensional embossed bright watermark effect by using the method based on the convolution relief and double single-increase compound mapping, so that the fusion of the carrier image and the bright watermark image is more natural.

Description

technical field [0001] The present invention relates to the technical field of information hiding, in particular to the technical field of image reversible information hiding, and in particular to a reversible bright watermarking method and device based on vector graphics compression. Background technique [0002] Information hiding has attracted more and more attention because of its good performance in intellectual property protection and authenticity identification of digital media, covert data communication in open network environment and so on. The so-called information hiding refers to a technology that utilizes the redundancy of the digital carrier to embedding watermark information to obtain a secret carrier by modifying the carrier data appropriately. But the information embedding process of the traditional information hiding algorithm will bring permanent distortion to the original carrier, and these distortions are unacceptable for some applications. In order to ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
CPCG06T1/0021G06T2201/0203
Inventor 郭宗明亓文法张彤
Owner PEKING UNIV
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