Inlaying method and device of digital watermarks in text documents

A text document and digital watermarking technology, applied in image data processing, image data processing, program/content distribution protection, etc., can solve problems such as embedding watermark information and inability to obtain text object data conveniently

Active Publication Date: 2014-01-08
李晓妮
View PDF4 Cites 54 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a method and device for embedding digital watermarks in text documents, which are used to solve the problem in the prior art that text object data in text documents in various electronic formats cannot be easily obtained

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Inlaying method and device of digital watermarks in text documents
  • Inlaying method and device of digital watermarks in text documents
  • Inlaying method and device of digital watermarks in text documents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0106] Embodiment 2, this embodiment considers the situation of embedding watermark information in a PDF file.

[0107] Different from MS Office word files, when you open a PDF file in the Acrobat Reader browser and select a virtual EMF printer to output it as an EMF file, the vector text object in it is no longer a vector TEXTOUT function record after conversion, but each character is output as A graphic, including points, lines, and curves, will finally use the FILLPATH command to fill this area. For example, the following is the corresponding output record for a character:

[0108] R3313: [059] EMR_BEGINPATH (s=8)

[0109] R3314: [027] EMR_MOVETOEX(s=16){ptl(3369,3594)}

[0110] R3315:[088]EMR_POLYBEZIERTO16(s=40){rclBounds(0,0,-1,-1),nbPoints:3,

[0111] P1(3371,3598)-Pn(3375,3607)}

[0112] R3316:[054]EMR_LINETO(s=16){ptl(3417,3602)}

[0113] R3317: [088] EMR_POLYBEZIERTO16(s=40){rclBounds(0,0,-1,-1),

[0114] nbPoints:

[0115] ...

[0116] R3396: [060] EMR_ENDPA...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to an inlaying method and device of digital watermarks in text documents. The method comprises the steps that electronic form text documents are converted to EMF documents, the converted initial EMF documents are opened, document header parameter information is used for setting up corresponding target EMF documents, all GDI functions and parameter information of the GDI functions in the initial EMF documents are all searched, whether the DGI functions are TEXTOUT is judged, if yes, all font information is read and watermark information is inlaid, and then the GDI functions are copied to the target EMF documents, if not, the DGI functions are directly copied to the target EMF documents, and after all the initial EMF documents are processed, all target EMF documents inlaid with the watermark information are subjected to the final output conversion operation. According to the method and device, the problem of watermark information inlaying of various electronic form text documents and paper text documents is solved, and safety monitoring and controlling, source tracing and content protection of important text documents are achieved.

Description

technical field [0001] The invention belongs to the technical field of document protection, and relates to a digital watermark embedding method in a text document, in particular to a digital watermark embedding method and device in an EMF enhanced metafile (Enhanced Metafile, EMF). Background technique [0002] With the rapid arrival of the era of knowledge economy, the role of knowledge in the competitive advantage of modern enterprises is unprecedentedly prominent, and the carrier of knowledge - electronic documents, has become the most valuable and important strategic resource in the operation of modern enterprises. Also in the office environment of government departments and enterprises and institutions, electronic documents have become an indispensable carrier for information exchange and knowledge transfer. Since the contents of documents are easily obtained and tampered with illegally during the dissemination of document information, the protection of important docume...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F21/16G06T1/00
CPCG06F21/16G06T1/0021
Inventor 李晓妮
Owner 李晓妮
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap