Method of generating information embedded halftone screen code

A coding and screen technology, applied in the field of information embedded screen coding, can solve the problem of low recognition, achieve high robustness, image quality will not be reduced, and the effect of great robustness

Inactive Publication Date: 2006-12-20
顾泽苍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0104] In order to solve the problems existing in the above-mentioned traditional information embedding method, the first purpose of the present invention is to propose

Method used

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  • Method of generating information embedded halftone screen code
  • Method of generating information embedded halftone screen code
  • Method of generating information embedded halftone screen code

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0266] interference ratio

Embodiment 2

[0268] interference ratio

Embodiment 3

[0270] interference ratio

[0271] It can be seen from the above embodiments that when the network points are disturbed, the smaller the similarity between codes is, the smaller the error rate will be; otherwise, the greater the similarity between codes, the higher the error rate will be. In particular, it can be clearly seen that when the similarity between dots is below 1 / 2, the error rate is very small.

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Abstract

The present invention provides a method of generating information embedded halftone screen code. According to this method, massive digital information can be stored through printing on at least one type of print media, such as images, texts, symbols, background, and so on. And the information embedded can be read and recognized simply and reliably. Particularly, the quality of the images will not be reduced after information embedded. The information printed on the media comprises a predetermined array of halftone dots with different morphology including physical and geometrical characteristics, which forms the computer codes to embed information into printed content. The advantages of this invention are: the maximum similarity value can be reduced to under the threshold value according to this method; the recognition performance of the halftone screen code can be improved; and robustness can still be maintained at a high level even though the paper is defected or polluted. Besides, the quality of the image will not be lowered and the image can keep its original condition after information embedded.

Description

technical field [0001] The invention relates to an information-embedded screen code which can embed a large amount of computer information by printing on a printing medium, especially a method for generating an information-embedded screen code. Background technique [0002] In recent years, researches on the digital watermarking theory of printing images on paper or embedding computer information in the background of images are very popular. As a representative achievement in Japan, "Using Digital Watermark to Realize Tampering Identification Technology of Printed Documents" was published in [Patent Publication 2003-209676]. "0", the information embedding method that identifies the propagation direction of the information module through the calculation of the classic Fourier transform. The problem is that the efficiency of information description is very low, especially when the embedded information is mixed with the printed content, and the unspecified printed content is a...

Claims

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Application Information

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IPC IPC(8): H04N1/00G06T1/00
Inventor 顾泽苍
Owner 顾泽苍
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