Method and device for detecting overlapped bank notes

Patent metadata

Field	Value
Publication number	US-10049523-B2
Application number	US-201515518584-A
Country	US
Kind code	B2
Filing date	Aug 7, 2015
Priority date	Oct 30, 2014
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A method for detecting overlapped bank notes is provided. The method includes: step 10, collecting original image data of bank notes; step 20, performing security thread positioning detection on the original image data of the bank notes, to obtain security thread detection data; step 40, determining whether the security thread detection data meets a preset security thread reference condition, going to step 60 if the security thread detection data meets the preset security thread reference condition, and going to step 70 if the security thread detection data does not meet the preset security thread reference condition; step 60, obtaining a determination result that the bank notes are not overlapped, and ending the method; and step 70, obtaining a determining result that the bank notes are overlapped, and ending the method.

First claim

The invention claimed is:

1. A method for detecting overlapped bank notes, comprising:
step 10 : collecting original image data of bank notes;
step 20 : performing security thread positioning detection on the original image data of the bank notes, to obtain security thread detection data;
step 40 : determining whether the security thread detection data meets a preset security thread reference condition, going to step 60 if the security thread detection data meets the preset security thread reference condition, and going to step 70 if the security thread detection data does not meet the preset security thread reference condition;
step 60 : obtaining a determination result that the bank notes are not overlapped, and ending the method; and
step 70 : obtaining a determining result that the bank notes are overlapped, and ending the method;
wherein in the step 20 , the security thread detection data comprises: a physical distance (X1, Y1) from an upper left vertex of a position of a security thread to a calibration side of a scanner, a physical distance (Xr, Yr) from a lower right vertex of the position of the security thread to the calibration side of the scanner, and an absolute position of the security thread to the calibration side determined based on the physical distance (X1, Y1) and the physical distance (Xr, Yr); and
wherein the step 40 further comprises:
step 41 : determining whether a width of the security thread meets the security thread reference condition, going to step 42 if the width of the security thread meets the security thread reference condition, and going to step 44 if the width of the security thread does not meet the security thread reference condition;
step 42 : determining whether a thickness of a security thread area meets the security thread reference condition, going to step 43 if the thickness of the security thread area meets the security thread reference condition, and going to step 44 if the thickness of the security thread area does not meet the security thread reference condition;
step 43 : determining that the bank notes are not overlapped in the security thread area, and going to step 50 ; and
step 44 : determining that the bank notes are overlapped in the security thread area, and going to step 70 .

2. The method for detecting overlapped bank notes according to claim 1 , wherein in the step 41 of determining whether the width of the security thread meets the security thread reference condition:
(X1, Y1) represents a position of an upper left vertex of a security thread of a single sheet of bank note to the calibration side, (Xr, Yr) represents a position of a lower right vertex of a security thread of a single sheet of bank note to the calibration side, (Xx, Yy) represents a position of an upper left vertex of a security thread of detected overlapped bank notes to the calibration side, (XX, YY) represents a position of a lower right vertex of a security thread of detected overlapped bank notes to the calibration side, and T represents a preset non-negative threshold parameter; and
it is determined that the width of the security thread does not meet the security thread reference condition and that the width of the security thread is abnormal if the width of the security thread meets |(XX,YY)−(Xx,Yy)|>|(Xr,Yr)−(X1,Y1)|+T, and it is determined that the width of the security thread meets the security thread reference condition and that the width of the security thread is normal if the width of the security thread does not meet |(XX,YY)−(Xx,Yy)|>|(Xr,Yr)−(X1,Y1)|+T.

3. The method for detecting overlapped bank notes according to claim 1 , wherein in the step 42 of determining whether the thickness of the security thread area meets the security thread reference condition:
a represents the thickness of the security thread obtained currently by a thickness sensor, b represents a reference value of the thickness of the security thread area, and t represents a preset non-negative threshold parameter; and
it is determined that the thickness of the security thread area does not meet the security thread reference condition and that the thickness of the security thread area is abnormal if the thickness of the security thread area meets a>b*t, and it is determined that the thickness of the security thread area meets the security thread reference condition and that the thickness of the security thread area is normal if the thickness of the security thread area does not meet a>b*t.

4. A device for detecting overlapped bank notes, comprising:
a data collecting module configured to collect original image data of bank notes to be detected;
a security thread positioning detection module connected with the data collecting module and configured to perform security thread positioning detection on the collected original image data of the bank notes, to obtain security thread detection data;
a security thread area overlapped bank notes detection module connected with the security thread positioning detection module and configured to determine whether a security thread area meets a security thread reference condition based on the security thread detection data, and determine that the bank notes are overlapped in the security thread area if the security thread detection data does not meet the security thread reference condition, and determine that the bank notes are not overlapped in the security thread area if the security thread detection data meets the security thread reference condition; and
an overlapped bank notes detection module connected with the security thread area overlapped bank notes detection module and configured to detect whether the bank notes are overlapped based on a local overlapped bank notes determination result for the security thread area and following a determination rule, wherein the determination rule comprises: determining that the bank notes are overlapped if the bank notes are overlapped in the security thread area; and determining that the bank notes are not overlapped if the bank notes are not overlapped in the security thread area;
wherein the security thread detection data comprises: a physical distance (X1, Y1) from an upper left vertex of a position of a security thread to a calibration side of a scanner, a physical distance (Xr, Yr) from a lower right vertex of the position of the security thread to the calibration side of the scanner, and an absolute position of the security thread to the calibration side determined based on the physical distance (X1, Y1) and the physical distance (Xr, Yr); and
wherein the security thread area overlapped bank notes detection module is further configured to:
determine whether a width of the security thread meets the security thread reference condition;
determine whether a thickness of a security thread area meets the security thread reference condition.

Assignees

• Grg Banking Equipment Co Ltd

Inventors

• You Jing
• Wang Qianwen
• Xu Jing

Classifications

• B65H2511/524

  Multiple articles, e.g. double feed · CPC title

• B65H7/02

  by feelers or detectors · CPC title

• G07D7/183

  Detecting folds or doubles · CPC title

• B65H7/125

  sensing the double feed or separation without contacting the articles · CPC title

• G07D7/164 Primary

  Thickness · CPC title