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Robust watermarking algorithm based on jnd for screen photography

A robust watermarking and screen technology, applied in the field of JND-based robust watermarking algorithm, to achieve high accuracy and accurate positioning

Active Publication Date: 2021-12-21
江苏羽驰区块链科技研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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However, when the extraction fails, the exact opposite of the extraction occurs

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  • Robust watermarking algorithm based on jnd for screen photography
  • Robust watermarking algorithm based on jnd for screen photography
  • Robust watermarking algorithm based on jnd for screen photography

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[0033] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

[0034] figure 1 , 2 They are respectively the watermark generation and embedding flow chart, watermark extraction and authentication flow chart of the embodiment of the present invention, and the specific content is as follows.

[0035] The first part, the preprocessing operation and the selection of the watermark embedding area.

[0036] Step 1.1. First select the host image embedded with the watermark, if it is a color image, first convert it into the YCrCb domain, and select the image of the Y channel as the host image; otherwise, directly use it as the host image.

[0037] Step 1.2...

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Abstract

The invention discloses a JND-based robust watermark algorithm for screen photography, including watermark embedding area selection, watermark embedding and extraction. In the embedding area selection stage, Gaussian function and intensity-based SIFT algorithm are used to find feature points, and the feature area is constructed from the density of feature points, so that the feature area is more concentrated on key content, and the location is more accurate during extraction and can resist certain cropping attacks; In terms of watermark embedding, the JND model is used to realize the adaptive change of embedding strength with image brightness and texture, and JPEG compression is considered, so that the strength maintains a corresponding relationship after compression, and a balance is achieved between robustness and invisibility; after embedding watermark , adjust the optimization constraints on the coefficients in the neighborhood to ensure that they are consistent with the coefficients modified during embedding. When using statistical features to extract watermarks, increase the number of coefficients with the correct size relationship to reduce the situation where the extraction results are just the opposite, with higher accuracy.

Description

technical field [0001] The invention relates to a robust digital watermarking technology for screen photography, which is used to protect leaked images caused by screen photography, in particular to a JND-based robust watermarking algorithm for screen photography. Background technique [0002] With the continuous development of information technology and the popularization of smart phones, people can obtain the important information they need by taking pictures of computer screens with their mobile phones. But at the same time, some important information can easily be stored, copied, and transmitted by illegal elements through mobile phones, which will cause the leakage of important information and cause a series of security problems. [0003] Digital watermarking is a common information hiding technology used for copyright protection and leakage tracking. The protection of the picture is achieved by embedding the watermark information into the picture. When a picture is l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
CPCG06T1/005G06T2201/0052
Inventor 孙星明武庆民韩进顾思宇李晓鹏孟若涵崔琦
Owner 江苏羽驰区块链科技研究院有限公司
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