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Method and device for filtering magnetic data

A data filtering and magnetic technology, applied in the field of data processing, to improve the quality and accuracy of algorithm identification, facilitate research, and eliminate periodic noise.

Inactive Publication Date: 2017-08-29
SHENZHEN YIHUA COMP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to propose a method and device for filtering magnetic data, aiming at solving the problem of how to remove the periodic noise introduced by the rotation of the floating roller

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  • Method and device for filtering magnetic data
  • Method and device for filtering magnetic data
  • Method and device for filtering magnetic data

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Embodiment 1

[0046] reference figure, figure 1 It is a schematic flowchart of the first embodiment of the magnetic data filtering method of the embodiment of the present invention.

[0047] In Embodiment 1, the method for filtering magnetic data includes:

[0048] Step 101, acquiring magnetic data, and determining whether the magnetic data includes the periodic noise introduced by the rotation of the floating roller according to the characteristics of the background noise in the magnetic data and the characteristics of the periodic noise introduced by the rotation of the floating roller;

[0049] Preferably, determining whether the magnetic data contains the periodic noise introduced by the rotation of the floating roller according to the characteristics of the background noise in the magnetic data and the characteristics of the periodic noise introduced by the rotation of the floating roller includes:

[0050] If the period of the background noise in the magnetic data is the same as the ...

Embodiment 2

[0071] refer to Figure 5 , Figure 5 It is a schematic diagram of the functional modules of the magnetic data filtering device according to the embodiment of the present invention.

[0072] In Embodiment 2, the device for filtering magnetic data includes:

[0073] A determining module 501, configured to acquire magnetic data, and determine whether the magnetic data includes the periodic noise introduced by the rotation of the floating roller according to the characteristics of the background noise in the magnetic data and the characteristics of the periodic noise introduced by the rotation of the floating roller ;

[0074] Preferably, refer to Figure 6 , Figure 6 is a schematic diagram of the functional modules of the determination module 501 in the embodiment of the present invention. The determining module 501 includes:

[0075] The determination unit 601 is configured to determine that the magnetic data contains the periodic noise introduced by the rotation of the ...

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Abstract

An embodiment of the invention discloses a method and a device for filtering magnetic data. A periodic noise can be well eliminated through frequency domain filtering. A periodic magnetic data noise which is introduced by rotation of a floating roller can be filtered. The quality of the magnetic data and an algorithm identification precision are greatly improved. A magnetic signal is converted from a spatial domain to a frequency domain through frequency domain analysis by means of Fourier transform. Research for the frequency spectrum structure and the change rule of a magnetic signal are facilitated. Furthermore the magnetic signal can be conveniently restored through inverse Fourier transform.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of data processing, and in particular to a method and device for filtering magnetic data. Background technique [0002] In the data environment collected by magnetic sensors, when the authenticity of banknotes is identified based on the difference between the magnetic point of the magnetic sensor and the background point data of the banknote, due to the influence of various external environments, the magnetic data will have noise. For the processing of space-dependent periodic noise introduced by mechanical reasons such as floating rolls, frequency domain filtering can be used to eliminate this periodic noise. [0003] The banknote data collected by the magnetic sensor often contains periodic noise due to the rotation of the floating roller. If such noise is not dealt with, it will affect the accuracy of magnetic algorithm identification. In the current magnetic algorithm, such noise ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G07D7/04
Inventor 李杰
Owner SHENZHEN YIHUA COMP