Anti-fake method for digital print based on digital watermark technology

A technology for digital watermarking and printing, applied in image data processing, image data processing, instruments, etc., can solve problems such as noise interference, and achieve the effect of improving robustness and reducing the amount of calculation.

Inactive Publication Date: 2013-04-24
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of noise interference and geometric transformation in digital prints, the present invention selects a quantization index modulation method with good robustness to noise interference for watermark embedding

Method used

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  • Anti-fake method for digital print based on digital watermark technology
  • Anti-fake method for digital print based on digital watermark technology
  • Anti-fake method for digital print based on digital watermark technology

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Embodiment Construction

[0032] In view of the two transformations existing in the printing and scanning process, the present invention selects the method of quantization index modulation that has better robustness against noise interference when embedding, and registers the image to be detected at the detection end to solve the geometric transformation zone. For non-synchronization problems that come, the detection results obtained are then statistically judged to achieve the goal of extracting watermark information completely and correctly. The specific implementation steps are as follows:

[0033] 1. Processing of original digital images:

[0034] 1) On the original digital image, select a number of feature points (four corner points are selected in this embodiment) to record their coordinates, and use the obtained coordinates and image size as a key;

[0035] 2) Generate digital watermark: such as Figure 4 As shown in a, the watermark in this embodiment takes a number as an example, and the number is f...

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Abstract

The invention provides an anti-fake method for digital print. The method includes the steps of: a) at a built-in end, processing carrier images, fixing special corners and coordinates thereof, then generating a binary form of digital watermark information, and using quantization index modulation for watermark embedding; b) at a detecting end, transforming images such as registration and interpolation, then detecting to acquire information, and processing the information for statistical decision. The anti-fake method for digital print is capable of resisting noise and geometric transformations of print, and being widely used in the printing field.

Description

Technical field [0001] The invention relates to an anti-counterfeiting method for digital printed matter based on digital watermarking technology, and belongs to the technical field of multimedia signal processing. Background technique [0002] Digital watermarking technology embeds some identification information (ie, digital watermarks) into digital carriers (including multimedia, documents, software, etc.) in a hidden manner. Through the information hidden in the carriers, the purpose of copyright protection and prevention of tampering can be achieved. With the emergence and development of printers and scanners, the reproduction of images has become very easy, which brings challenges to the copyright protection of printed matter. The invisibility and robustness of digital watermarking technology provides an effective solution for the copyright protection of printed matter. [0003] In the process of printing and scanning digital prints, two attacks, noise superposition and geom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/16G06T1/00
Inventor 刘琚田敏万文博王锋冯峰
Owner SHANDONG UNIV
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