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Banknote Magnetic Signal Recognition Method Based on Discrete Fourier Transform

A technology of discrete Fourier transform and recognition method, which is applied in the field of banknote magnetic signal recognition based on discrete Fourier transform, can solve problems such as lack of versatility and complex implementation, and achieve the effect of banknote authentication and rapid detection

Active Publication Date: 2022-03-08
CASHWAY FINTECH CO LTD
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Problems solved by technology

This method is complicated to implement and does not have universality between the magnetic signals of different types of banknotes

Method used

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  • Banknote Magnetic Signal Recognition Method Based on Discrete Fourier Transform
  • Banknote Magnetic Signal Recognition Method Based on Discrete Fourier Transform
  • Banknote Magnetic Signal Recognition Method Based on Discrete Fourier Transform

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0020] Such as figure 1 As shown, the banknote magnetic signal recognition method based on discrete Fourier transform of the present invention includes:

[0021] S1 selects several banknotes to collect magnetic signal data, each banknote magnetic signal data contains m data channels, and each channel contains n data points.

[0022] S2 analyzes and processes the magnetic signal data of several banknotes, including de-interference and averaging operations, and obtains the standard magnetic signal data Data[m,n] of banknotes.

[0023] S3 performs discrete Fourier transform on the magnetic signal of each channel, and decomposes it into n triangular waves, and the coefficient array obta...

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Abstract

The invention discloses a banknote magnetic signal recognition method based on discrete Fourier transform, which comprises the steps of: discrete Fourier transform the standard magnetic signal data of each channel of a predetermined number of banknotes, obtain a coefficient array, and remove invalid values ​​in the coefficient array signal to obtain an array of effective coefficients; the value range of each module length of the array of effective coefficients obtained through data experiments is recorded as a threshold array; the array of effective coefficients and the array of thresholds are stored in the memory of the banknote recognition module; The array is compared with each item of the effective coefficient array stored in the memory, and the judgment result of the banknote magnetic signal is output according to the comparison result. The invention can quickly analyze the magnetic signal of the collected banknotes to judge whether there is a problem with the magnetic signal, thereby realizing rapid detection of the magnetic signal of the banknotes and realizing counterfeiting of the banknotes.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a banknote magnetic signal identification method based on discrete Fourier transform. Background technique [0002] With the advancement and development of science and technology, the counterfeit features of banknotes are becoming more and more comprehensive, and magnetic features are an important part of counterfeit banknotes. At present, the magnetic sensors in the banknote identification module all use magnetic signal sensors, and the common algorithm is based on logical judgment. This method is complex to implement and does not have universality between the magnetic signals of different types of banknotes. Contents of the invention [0003] The purpose of the present invention is to provide a banknote magnetic signal identification method based on discrete Fourier transform, which has a clear structure and strong versatility, aiming at the technical defects in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G07D7/04G06K9/00G06F17/14
Inventor 武艳红刘贯伟安增花
Owner CASHWAY FINTECH CO LTD
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