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Method and device for improving anti-damage of word and image in machine readable tag

A label and text technology, applied in the field of enhancing the damage resistance and device of text and graphics in machine-readable labels, can solve the problems of barcode invalidation, trouble, and high-value document failure

Inactive Publication Date: 2008-05-21
HUNAN TONGSEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the barcodes on certificates, financial and legal documents are intentionally altered, the only existing preventive measure is to "invalidate the barcodes", resulting in "invalidation of high-value documents", which brings great trouble to the actual work

Method used

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  • Method and device for improving anti-damage of word and image in machine readable tag
  • Method and device for improving anti-damage of word and image in machine readable tag
  • Method and device for improving anti-damage of word and image in machine readable tag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Method for making anti-alteration and anti-wear labels:

[0026] (1) Using an optical image conversion device K to map binary text and graphics into multi-grayscale patterns

[0027] combined with figure 1 : The original representation form of the text and graphic information is a phase binary image (G 二值-相位 ). In the present invention, the original image G is recorded and displayed on a transparent carrier such as a spatial modulator and a phase latex film 二值-相位 . use figure 1 The optical image conversion device K transforms the phase-type binary image G binary-phase into a machine-readable multi-grayscale image G multi-grayscale. The aberration-corrected convex lens 3 (focal length=f) is the main component to realize this transformation, and one of the functions of the lens 3 is to transform the original binary image ( figure 1 The single pixel at position 2) is mapped to the entire format of the multi-grayscale image of imaging surface 4, that is,...

Embodiment 2

[0048] Example 2: Making high-value documents such as ID cards and passports by using multi-grayscale patterns:

[0049] combined with Figure 7 :

[0050] By the method that embodiment 1 provides, make the multi-gray scale figure 23 and 24 (being G 多灰阶 →相位 and G 多灰阶→振幅 ), and printed or pasted on the certificate 21 (or high-value document). In order to store the photo and three fingerprints required for authentication, about 2800 bytes are required. With the error correction code, a total of 3400 bytes are required. The area occupied by ordinary barcodes in passports is about 80×18mm 2 , the area occupied by ordinary barcodes for ID cards is about 64×18mm 2 . Due to the high density of the optical storage of the present invention, it is sufficient to covertly record the identity verification information of the certificate holder in the above-mentioned area by means of Young's stripe coding. If a halftone multi-grayscale image is printed in an area of ​​80×23mm2, unde...

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PUM

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Abstract

A method for correctly machine - reading pattern and word in countermark on partially damaged valuable document includes using two - valued phase patter to present word and pattern then forming a frame of multigrey scale pattern by using optical mapping conversion device to diffuse each pixel element on original two - valued phase pattern to complete surface of countermark, using orientation angle size of two adjacent sets of speckle Young's interference fringe to present pixel element grey scale. The said method can be used to carry out correct machine - read on damaged document with residual area of 75 % original document.

Description

technical field [0001] The invention relates to an anti-counterfeiting method and device for high-value documents such as certificates, laws and finance. Especially under the condition of partial damage, the method and device can correctly machine read the graphics and characters in the label. Background technique [0002] In order to facilitate the graphic information on high-value documents such as machine-readable documents, laws, and finance, the most common method is to record the graphic information on the label with a binary barcode. The symbol element of a conventional barcode is a binary sequence consisting of information bits and error correction bits. When machine-reading binary barcodes, individual bits in the symbol may occasionally be wrong. Such errors can be corrected using conventional error correction control coding principles. However, if the carrier of the binary barcode is partially damaged, resulting in the absence of one (or a group) of symbols, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K5/00G06K17/00
Inventor 谭吉春唐新怀郭宏瑞贾辉周扑廖丹何新张丽强王晓峰刘莉文贝
Owner HUNAN TONGSEN TECH
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