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Apparatus and method for abstracting and imbedding digital watermarking in two value text image

A text image, digital watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of resisting printing, copying, scanning, attack, blind extraction, etc., and achieve good visual effects, resisting printing and copying, and reducing copying effects.

Active Publication Date: 2008-07-30
PEKING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Embodiments of the present invention provide a method and device for embedding and extracting digital watermarks in binary text images, to solve the problem that the digital watermark embedding methods for binary text images in the prior art cannot meet the requirements of resistance to printing and copying (especially shrink copy) and scanning attacks, maintain good visual effects and achieve blind extraction when extracting watermarks

Method used

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  • Apparatus and method for abstracting and imbedding digital watermarking in two value text image
  • Apparatus and method for abstracting and imbedding digital watermarking in two value text image
  • Apparatus and method for abstracting and imbedding digital watermarking in two value text image

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Embodiment 1

[0133] As shown in Figure 2, a binary text image composed of small four characters in Chinese script, adopts the method for embedding a watermark in a binary text image described in the embodiment of the present invention to embed 30-bit watermark information to it, The obtained image after embedding the watermark is shown in Figure 4. Figure 5A is a partial enlargement of a binary text image before embedding a watermark, and Figure 5B is a partial enlargement of a binary text image after embedding a watermark. Comparing Figure 5A and Figure 5B, it can be concluded that the visual effect of the image after embedding the watermark is good, It is difficult to see traces of characters being modified. In fact, the characters embedded in the watermark are only slightly thicker or thinner, which does not affect the overall frame of the characters. After the image is printed, the printed copy of the paper medium is scanned by a scanner into an electronic file in the computer to becom...

Embodiment 2

[0137] As shown in Figure 11, for a binary text image composed of Chinese imitation Song Xiaosi No. 4 characters, adopt the method for embedding watermark in the binary text image described in the embodiment of the present invention, and embed 30-bit watermark information to it , get the image after embedding the watermark as shown in Figure 12. It can be seen that the image after embedding the watermark maintains a good visual effect. Print, scan and binarize the image 12 to obtain a text image in binary image format, as shown in FIG. 13 . Using the method for extracting a watermark from a binary text image described in the embodiment of the present invention, all 30-bit watermark information can be successfully extracted from FIG. 13 .

[0138] To copy and reduce the printed paper document (reduced copy ratios are 86% and 60%), scan the copy into the computer to obtain a grayscale image, binarize the grayscale image to obtain a binary image format Text images, as shown in ...

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Abstract

The invention discloses a method of embedding watermarks in a binary text image and a device thereof. The method comprises the following steps: the binary text image is divided into an embedded part and an adjustment part partially or entirely; the average of black pixel points contained in each set of the embedded part and the adjustment part is calculated; color change parameters are calculated according to the average and the number of the black pixel points contained in each set of the embedded part; the number of the black pixel points contained in each set of the embedded part and the adjustment part is changed according to the color change parameters. In this way, watermarks are embedded. The invention also discloses a method of extracting watermarks from the binary text image and a device thereof. The image with embedded watermarks looks good, and can better resist the attacks of printing, copy (in particular reduced copy) and scanning. The Original image are not required when watermarks are extracted.

Description

technical field [0001] The invention relates to the technical fields of information hiding and digital watermarking, in particular to a method and device for embedding and extracting digital watermarks in binary text images. Background technique [0002] Information hiding is a new research hotspot in the field of information security. Information hiding includes secret-related data communication in an open network environment, intellectual property protection of digital products, authenticity identification of important documents and digital signatures, and post-disclosure of confidential documents. The source tracking of news provides reliable information security guarantee. Digital watermarking and image steganography are two branches of information hiding technology. [0003] Since the digital watermarking technology was born in the early 1990s, it has developed rapidly and rapidly in the past ten years. Research on grayscale image, audio and video watermarking technol...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 李晓龙亓文法程道放杨斌
Owner PEKING UNIV
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