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A watermark embedding method and apparatus in a text image

A text image, watermark embedding technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of lack of font information, poor attack ability such as photography and defacement, and poor visual effect.

Pending Publication Date: 2018-12-25
李晓妮
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method and device for embedding watermark information in text images using vector font watermark technology, which is used to solve the problem of small watermark information embedded in text images in the prior art, poor visual effects and problems under the premise of lack of font information. Technical problems of poor resistance to attacks such as copying, photographing and defacement

Method used

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  • A watermark embedding method and apparatus in a text image
  • A watermark embedding method and apparatus in a text image
  • A watermark embedding method and apparatus in a text image

Examples

Experimental program
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Effect test

Embodiment 2

[0094] Step 1: Perform OCR recognition on the text image to obtain the encoding information and character image I of all characters 1 dot matrix data.

[0095] Step 2, read the corresponding character image I from the watermark font library according to the encoding information of the character 2 .

[0096] According to the font attribute of the character in the text image, read the corresponding character image I 2 , and the character image I 2 The size of the character image I 1 The size of the character image I 3 .

[0097] Step 3, in the character image I 1 At the position, the character image I 3 Direct replacement character image I 1 Thus, the text image embedded with watermark information is obtained.

Embodiment 3

[0099] Step 1: Perform OCR recognition on the text image to obtain the encoding information and character image I of all characters 1 dot matrix data.

[0100] Step 2, according to the encoding information of the character, read the corresponding character image I from the standard font library and the watermark font library respectively 2 and I 3 dot matrix data.

[0101] Step 3, by comparing the character image I 2 and I 3 The different calculations of , get the set of difference pixel points of the character image.

[0102] When calculating the difference pixel set of a character image, it is not searched by traversing the skeleton curve of the character image, but directly calculates the character image I 2 and I 3 , so as to obtain the image difference area Θ composed of a set of difference pixels.

[0103] Step 4, map the set of difference pixels to the character image I 1 , and for the character image I 1 Automatic modification is performed to embed watermark i...

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Abstract

The invention relates to a watermark embedding method and apparatus in a text image. The method comprises the following steps: 1 OCR recognition is performed on a text image to obtain encoded information of all characters and dot matrix data of a character image I1; 2, respectively reading the dot matrix data of the corresponding character images I2 and I3 from the standard character library and the watermark character library according to the character coding information; 3, calculating different pixel points set of that character image by comparing different character images I2 and I3; 4, mapping the difference pixel point set to the character image I1, and automatically modifying the character image I1 to embed the watermark information. The device comprises an OCR recognition module, acharacter image reading module, an image comparing module and a character image modifying module. The invention effectively overcomes the shortcomings of small information capacity, poor document visual effect and poor robustness against attacks such as copying, photographing and defilement in a binary text image watermarking algorithm.

Description

technical field [0001] The invention belongs to the technical field of document protection and image processing, and relates to a digital watermark embedding method and device, in particular to a watermark embedding method and device in a text image. Background technique [0002] Today, with the rapid development of information science, ordinary paper as the carrier of the most important data records still exists, and it will be disseminated in the form of paper by printing, scanning, copying and other methods. In some cases, paper documents are even more irresistible. alternative. [0003] With the continuous improvement of the degree of automated office, printers and copiers have become the most indispensable auxiliary equipment, but at the same time, the confidentiality of documents is facing new problems. For example, secret-related documents are easy to be copied during transmission and cause loss of control, and copiers have become a convenient tool for leaking and st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0021
Inventor 李晓妮
Owner 李晓妮
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