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Document watermark copyright information protection device based on Opentype vector outline fonts

A copyright information and protection device technology, applied in computer security devices, program/content distribution protection, electronic digital data processing, etc., can solve the problems of low robustness and complicated operation, and achieve high robustness and simple operation , Resistance to format adjustment attacks and print scan attacks

Inactive Publication Date: 2012-06-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the document needs to be converted into an image before embedding the watermark, which leads to the disadvantages of low robustness and complicated operation of the existing document watermark algorithm, and proposes a document based on the Opentype vector outline font Watermark copyright information protection device

Method used

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  • Document watermark copyright information protection device based on Opentype vector outline fonts
  • Document watermark copyright information protection device based on Opentype vector outline fonts
  • Document watermark copyright information protection device based on Opentype vector outline fonts

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specific Embodiment approach 1

[0038] Specific implementation mode one: the following combination Figure 1-4 This embodiment will be described.

[0039] A document watermark copyright information protection device based on Opentype vector outline fonts includes the following modules: font management center module 1, document watermark copyright information embedding module 2, document watermark copyright information extraction module 3, print document preprocessing module 4, document watermark copyright Information anti-scan print detection module 5, standard Opentype font library module 6 and print document module 7 containing copyright information;

[0040] The font library management center module 1 manages the original standard font library information not embedded with any watermark information, and provides the required comparison information for the document watermark copyright information extraction module 3 and the document watermark copyright information anti-scanning printing detection module 5;...

specific Embodiment approach 2

[0045] Specific implementation mode two: the following combination figure 2 Describe this embodiment, the difference between this embodiment and Embodiment 1 is: the described document watermark copyright information embedding module 2 implements the steps of embedding watermark copyright information as follows:

[0046] Step 1: The user sets the generation conditions, selects the Opentype font type, specific text, embedded copyright information, and font modification scale;

[0047] Step 2: According to the text type selected by the user and the specific text in the document, parse the font file and extract the vector outline of the text, generate N quadratic Bezier curves describing the text, where N is a positive integer, when the embedded copyright information When the number of characters is greater than N, prompt the user to skip to step 1 to reduce the copyright information or re-select the text. When the number of embedded copyright information characters is not great...

specific Embodiment approach 3

[0051] Specific implementation mode three: the following combination image 3 Describe this embodiment, the difference between this embodiment and Embodiment 1 is: the steps of implementing the watermark copyright information extraction method of the document watermark copyright information extraction module 3 are:

[0052] Step A: The user extracts the watermark font with copyright information. If it cannot be determined, the format of the watermark text to be extracted is analyzed, and the font is extracted to modify the scale;

[0053] Step B: Analyze the format of the watermark text to be extracted, extract N quadratic Bezier curves and store them in order from left to right and from top to bottom, where N is a positive integer;

[0054] Step C: Extract the vector outline corresponding to the original text from the font management center 1 through the font type set by the user, extract N quadratic Bezier curves and store them in order from left to right and from top to bot...

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Abstract

The invention discloses a document watermark copyright information protection device based on Opentype vector outline fonts, belongs to the fields of digital watermark technologies and document information protection in information safety, and aims to solve the problems of low robustness and complexity in operation of the conventional document watermark technology caused by conversion of a document into an image before a watermark is embedded. A font library management center module manages original standard font library information in which watermark information is not embedded, and provides comparison information; a document watermark copyright information embedding module generates specific watermark characters through selected Opentype fonts and embedded copyright information; a document watermark copyright information extraction module extracts the copyright information according to comparison parameters; a printed document pre-processing module scans a printed document, and performs image binarization, de-noising, positioning and refining to form continuous single-pixel curves; and a document watermark copyright information anti-scanning printing detection module extracts stroke parameters. The document watermark copyright information protection device based on the Opentype vector outline fonts is applicable to protection of document watermark copyright information.

Description

technical field [0001] The invention relates to a document watermark copyright information protection device, which belongs to the fields of digital watermark technology and document information protection in information security. Background technique [0002] As an aspect of digital watermarking technology, document watermarking has attracted people's attention since 1995 and has become a hot spot in watermarking technology. According to the embedding principle and different carrier forms, the current document watermarking algorithms include watermarking algorithms based on word shifting and line shifting, and character feature watermarking algorithms. The watermarking algorithm based on word shifting and line shifting is to embed watermarks by slightly changing the distance between words and lines in the document. This type of algorithm is suitable for electronic documents described by PostScript such as PDF and PS files. This type of algorithm can resist binarization att...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/22G06F21/24G06F21/16
Inventor 牛夏牧李琼韩琦石振锋王莘
Owner HARBIN INST OF TECH
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