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Method and device for detecting double sheet of paper

A detection method and technology of a detection device are applied in a device for accepting coins, an inspection of the authenticity of banknotes, and in the processing of coins or valuable banknotes. The effect of false detection rate

Active Publication Date: 2019-07-09
SHENZHEN YIHUA COMP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method and device for detecting double-sheeting of banknotes, aiming to solve the problems of low detection accuracy and high false detection rate in the detection of double-sheeting of banknotes in the prior art

Method used

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  • Method and device for detecting double sheet of paper
  • Method and device for detecting double sheet of paper

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Experimental program
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Embodiment 1

[0026] figure 1 It shows the implementation process of the method for detecting duplicated banknotes provided by Embodiment 1 of the present invention. For the convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

[0027] In step S101, an infrared transmission image of the banknote is obtained.

[0028] It should be noted that the infrared transmission image of the banknote obtained above is a grayscale image of the infrared transmission image. When the banknote is double-folded, its infrared transmission characteristics will become weaker, that is, when the banknote to be tested is not double-folded, the acquired The infrared transmission image of the banknote is brighter (large gray average value), and when the banknote to be tested is double-sheeted, the acquired infrared transmission image of the banknote is darker (small gray average value).

[0029] In step S102, the gray average value of the preset position ar...

Embodiment 2

[0062] In order to realize the first embodiment of the present invention figure 1 In the method for detecting duplicated banknotes shown, this embodiment provides a device for detecting duplicated banknotes. figure 2 The structure of the detection device for double-sheeting banknotes is shown. For the convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

[0063] The device 20 for detecting duplicated banknotes includes an image acquisition module 201 , an average calculation module 202 , a judgment module 203 , a first judgment module 204 and a second judgment module 205 .

[0064] The image acquisition module 201 is used to acquire the infrared transmission image of the banknote.

[0065] The average calculation module 202 is used to calculate the gray average value of the preset position area of ​​the infrared transmission image.

[0066] The judging module 203 is used for judging whether the average grayscale va...

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Abstract

The invention is suitable of the technical field of paper money detection and provides a paper sheet overlapping detecting method and device. The method includes acquiring an infrared transmission map of paper money; calculating a gray average of a preset area of the infrared transmission map; judging whether the gray average is smaller than a gray threshold value or not; judging the thickness of paper money based on a first thickness detection threshold value so as to determine whether the paper money is overlapped or not if the gray average is smaller than the gray threshold value and judging the thickness of the paper money based on a second thickness detection threshold value so as to determine whether the paper money is overlapped if the gray average is not smaller than the gray threshold value , wherein the first thickness detection threshold value is smaller than the second thickness detection threshold value. By setting the first thickness detection threshold value and the second thickness detection threshold value, when the gray average is smaller than the gray threshold value, whether the paper money is overlapped is detected based on the first thickness detection threshold vale; when the gray average is not smaller than the gray threshold value, whether the paper money is overlapped or not is detected based on the second thickness detection threshold value. Paper money overlapping detection accuracy is improved and error detection rate is reduced.

Description

technical field [0001] The invention belongs to the field of banknote detection, and in particular relates to a method and device for detecting duplicated banknotes. Background technique [0002] For self-service financial transaction equipment, accurately identifying the number of banknotes is one of the basic functions it needs to have. During the user's transaction process, due to repeated banknotes, the identification of the number of banknotes will be inaccurate, thereby causing losses to the user. Existing detection of whether the paper currency is doubled is to detect the thickness of the paper money through the thickness sensor, and rely on the judgment processing program to judge whether the paper money to be inspected has the problem of double paper. However, such a detection method has the problems of low detection accuracy and high false detection rate, and the false detection rate is greatly increased. Contents of the invention [0003] The invention provide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G07D11/22G07D7/164
CPCG07D7/164G07D11/22
Inventor 黄勃
Owner SHENZHEN YIHUA COMP
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