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Method and device of obtaining banknote security thread boundary

A security thread, banknote technology, applied in the field of obtaining banknote security thread borders

Inactive Publication Date: 2016-03-23
SHENZHEN YIHUA COMP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to propose a method and device for obtaining the security line boundary of banknotes, aiming to solve the problem of how to accurately locate the security line edge and quickly detect the integrity of the security line

Method used

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  • Method and device of obtaining banknote security thread boundary
  • Method and device of obtaining banknote security thread boundary
  • Method and device of obtaining banknote security thread boundary

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] refer to figure 1 , figure 1 It is a schematic flow chart of a method for obtaining banknote security line boundaries according to an embodiment of the present invention.

[0076] In Embodiment 1, the method for obtaining the banknote security line boundary includes:

[0077] Step 101, intercepting the area of ​​the banknote security line to be detected;

[0078] Preferably, said intercepting the area of ​​the banknote security thread to be detected includes:

[0079] According to the infrared transmission diagram of the banknote to be detected and the area facing the interception security line;

[0080] According to the infrared transmission diagram of the banknote to be detected and the area facing to intercept the security line, it includes:

[0081] Select the BD image of the banknote to be detected, and intercept the area of ​​the security line at a resolution of 100dpi as X[320:410], Y[1; end].

[0082] Step 102, obtaining the gray value information of the re...

Embodiment 2

[0100] refer to image 3 , image 3 It is a schematic flow chart of a method for obtaining banknote security line boundaries according to an embodiment of the present invention.

[0101] On the basis of Embodiment 1, the method for obtaining the banknote security line boundary further includes:

[0102] Step 106, if X[L]≤T, then calculate X[L-n]=column[L]-column[L-n-1] and X[L+n]=column[L]-column[ L+n+1];

[0103] Step 107, comparing X[L-n] and X[L+n] with threshold T respectively;

[0104] Step 108, if X[L-n]>T, then the L-n column is the left edge column of the security line, otherwise continue to move left and detect until the left edge column is found;

[0105] Step 109, if X[L+n]>T, then the column L+n is the right edge column of the safety line, otherwise continue to move right and detect until the right edge column is found.

[0106] Specifically, if X[L]T, then L-1 is the left edge column of the safety line, otherwise continue to move to the left until Find the l...

Embodiment 3

[0108] refer to Figure 4 , Figure 4 It is a schematic flow chart of a method for obtaining banknote security line boundaries according to an embodiment of the present invention.

[0109] On the basis of embodiment one or embodiment two, on the basis of embodiment one, the method also includes:

[0110] Step 110, obtaining the width W=L2-L1-2 of the security line according to the position coordinates of the left and right edges of the security line, where L1 is the left edge of the security line, and L2 is the right edge of the security line;

[0111] Step 111, comparing the width W with the security thread width range of normal banknotes;

[0112] Step 112, if the W is within the width range of the security thread of the normal banknote, then determine that the security thread is normal;

[0113] Step 113, if the W is outside the width range of the security thread of the normal banknote, it is determined that the security thread is abnormal.

[0114] Specifically, compar...

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Abstract

The embodiment of the invention discloses a method and device of obtaining a banknote security thread boundary. By utilizing the characteristic that the gray value of a security thread must be the smallest, according to the characteristics of narrow self width and small searing amount of the security thread, a new banknote security thread integrity detection method is designed. A gray value column projection method is employed to obtain the characteristics of the security thread; the security thread is preliminarily positioned according to the stable and obvious feature that a gray value lowest column must be on the security thread, thereby improving accuracy and eliminating interference. The method and device perform searching from a minimum column to the left and right; the searching at a curve steep portion is not influenced by a curve smooth portion, thereby eliminating the influence of security thread inclination, security thread edge darkening, etc. to integrity detection.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of banknote detection, and in particular to a method and device for acquiring banknote security line boundaries. Background technique [0002] The existing security line integrity detection generally uses difference to find the inflection point of the gray value column by column. This method not only has a large number of searches, but is also easily affected by noise, etc., and often cannot accurately find the edge of the security line. Contents of the invention [0003] The purpose of the embodiments of the present invention is to provide a method and device for obtaining the border of the banknote security thread, aiming at solving the problem of how to accurately locate the edge of the security thread and quickly detect the integrity of the security thread. [0004] To achieve this purpose, the embodiments of the present invention adopt the following technical solutions: [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G07D7/20
CPCG07D7/2016
Inventor 周彦华
Owner SHENZHEN YIHUA COMP
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