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Digital watermark embedded and extracting method and device

A technology of digital watermarking and watermarking information, applied in image data processing, image data processing, instruments, etc., can solve the problems of lack of versatility, weak robustness, and poor image visual effect.

Inactive Publication Date: 2008-02-06
BEIJING FOUNDER ELECTRONICS CO LTD +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] The present invention provides a method and device for embedding and extracting digital watermarks, which are used to solve the problem in the prior art that the methods of embedding and extracting digital watermarks in binary text images do not have universality, and are further used to solve the problem of watermark extraction The process is not robust to printing and scanning attacks, and it is also used to solve the problem of poor visual effects of images embedded with watermarks

Method used

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  • Digital watermark embedded and extracting method and device
  • Digital watermark embedded and extracting method and device

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Embodiment Construction

[0085] The idea of ​​the present invention is to embed the watermark information into the text image by using the number of black dots in the connected region after obtaining the contour code chain of the closed connected region, so as to obtain a digital watermark embedding method. The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0086] As shown in Figure 1, it is the main flow chart of the digital watermark embedding scheme of the present invention, comprising the following steps:

[0087] S101. Obtain a watermark information bit string to be embedded, and preprocess the watermark information;

[0088] In this step, first obtain the watermark information bit string to be embedded, and the information can be any digital data such as digital image, text, audio and video. The compression algorithm is used to compress the watermark information bit string to increase the amount of embedded information....

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Abstract

The present invention relates to a method and device of embedding and extraction of digital watermarking. The invention is to solve the prior art problem that the method for embedding and extracting of digital watermarking in the binary document image has no commonality. The embedding method of digital watermarking includes the steps as follows: acquiring the message bit string of watermarking which needs embedded; searching for the closed connect region consisted of characters, obtaining the profile code strand of connect region; calculating the first pixel value of pixel which needs to turn according to the smudge number in the connect region, the message bit string of watermarking and the first step; turning the pixel along the profile code strand based on the first pixel value. The method of the present invention has a simple embedding and extraction procedure without blocking or scrambling process in advance as well as not depends on the makeup of the text content; therefore, the calculating rate is increased, and the attack during the printing and scanning is effectively prevented, facilitating the follow of the message.

Description

technical field [0001] The invention relates to a method and device for embedding and extracting digital watermarks, in particular to a method and device for embedding and extracting digital watermarks in black and white binary text images. Background technique [0002] With the rapid development of computer networks and multimedia systems, digital media (digital audio, digital image, digital video) are widely used, and the copyright protection and integrity protection of digital media has become an urgent problem to be solved. The text documents among them are not only stored in the computer in digital format, but can also be transmitted in the form of paper by printing, scanning, copying and other methods. In fact many paper documents (such as contracts, bills, etc.) are more valuable than those multimedia such as audio, video or images. With the application and popularization of equipment such as computers, printers and scanners, copying and reproduction technology has b...

Claims

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Application Information

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IPC IPC(8): H04N1/32G06T1/00
Inventor 亓文法熊怀欣李晓龙杨斌王立东
Owner BEIJING FOUNDER ELECTRONICS CO LTD
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