An auxiliary design method of a long-side bill feeding magnetic feature authentication module

Abstract

This invention discloses an auxiliary design method for a banknote magnetic feature authentication module with a long-side feed, comprising: feeding the banknote along its long side and scanning it along its short side using a magnetic image sensor to obtain a magnetic image of the banknote; setting the detection width, number of channels, and sensitivity of the magnetic feature sensor; selecting a series of intensity values ​​from the banknote magnetic image column to simulate the magnetic feature sensor scanning signal; performing morphological dilation of the structural elements along the long side of the banknote magnetic image to simulate the magnetic feature sensor scanning image; and simulating multi-mode magnetic feature sensor scanning signals at the long side position of the banknote. This method displays the banknote magnetic image and the simulated magnetic feature sensor scanning image, allowing selection of a suitable scanning position from both. Simultaneously, based on the selected position, three sets of signal references are output to confirm suitability, thus completing the auxiliary design.

Description

Technical Field

[0001] This invention relates to the field of banknote authentication technology, and in particular to an auxiliary design method for a banknote magnetic feature authentication module with a long edge. Background Technology

[0002] With the continuous development of magnetic sensor technology, magnetic image sensors have been successfully developed and are beginning to be applied in the field of banknote authentication. Magnetic image sensors, in conjunction with a uniform-speed paper feed device, can detect the complex magnetic distribution on banknotes and convert it into a magnetic image, thus enabling quantitative authentication of banknotes based on their magnetic characteristics. Therefore, quantitative analysis and authentication of the magnetic distribution on banknotes using magnetic images has significant research value and great application potential in the field of counterfeit detection. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this invention is to provide an auxiliary design method for a long-edge banknote magnetic feature authentication module.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] An auxiliary design method for a long-side banknote magnetic feature authentication module includes:

[0006] Banknote A is fed along its long side, and its magnetic image is obtained by scanning along its short side using a magnetic image sensor.

[0007] B sets the detection width, number of channels, and sensitivity of the magnetic feature sensor;

[0008] C selects a series of intensity values ​​from the magnetic image column of the banknote to simulate the scanning signal of the magnetic feature sensor; morphological dilation of the structural elements in the long side direction of the banknote magnetic image is performed to simulate the scanning image of the magnetic feature sensor.

[0009] D selects the long side of the banknote to simulate the magnetic feature sensor scanning signal in multiple modes.

[0010] Compared with the prior art, one or more embodiments of the present invention may have the following advantages:

[0011] This method displays the magnetic image of the banknote and the simulated magnetic feature sensor scan image. A suitable scanning position can be selected on the displayed magnetic image of the banknote and the simulated magnetic feature sensor scan image. At the same time, based on the selected position, three sets of signal references are output to finally confirm whether it is suitable and complete the auxiliary design. Attached Figure Description

[0012] Figure 1 A flowchart illustrating an auxiliary design method for a long-side banknote magnetic feature authentication module;

[0013] Figure 2 It is a magnetic image of a banknote;

[0014] Figure 3 It directly compares the simulated magnetic feature signal with the actual magnetic feature signal by taking the intensity values ​​listed above the magnetic image;

[0015] Figure 4 It is a comparison of the simulated magnetic characteristic signal and the actual magnetic characteristic signal as described in claim 4;

[0016] Figure 5 It is a comparison of the simulated magnetic characteristic signal and the actual magnetic characteristic signal as described in claim 5;

[0017] Figure 6 This is a schematic diagram illustrating the inconsistency between long-side and short-side scanning using a magnetic image sensor. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the embodiments and accompanying drawings.

[0019] Example: Let the detection width of the magnetic image sensor be B. image 180mm; Number of channels (pixels) C image 720; Sensitivity S image 60dB.

[0020] Detection width B of the target magnetic feature sensor sensor 180mm, number of channels C sensor 18; Sensitivity 60dB.

[0021] Figure 1 A flowchart illustrating an auxiliary design method for a long-side banknote magnetic feature authentication module includes the following steps:

[0022] Banknote A is fed along its long side, and a magnetic image sensor is used to scan it along its short side to obtain a magnetic image of the banknote; see [link / reference]. Figure 2 .

[0023] Both magnetic image sensors and magnetic feature sensors are directional. Different banknote insertion methods correspond to different scanning methods, and the obtained magnetic images and magnetic feature signals are different.

[0024] The magnetic image sensor scans along the short side, and the angular error must be controlled within ±10°.

[0025] The detection width B of the magnetic image sensor image Number of channels (number of pixels) C image Sensitivity S image .

[0026] B sets the detection width, number of channels, and sensitivity of the magnetic feature sensor;

[0027] Detection width B of the target magnetic feature sensor sensor Number of channels C sensor Generally, it is consistent with products on the market.

[0028] Sensitivity S of magnetic feature sensor sensor (Magnification) can be adjusted via factory settings.

[0029] C selects intensity values ​​from the surrounding columns of the banknote's magnetic image to simulate the scanning signal of the magnetic feature sensor; morphological dilation of the structural elements along the long side of the banknote's magnetic image is then performed to simulate the scanning image of the magnetic feature sensor.

[0030] Data is acquired from the magnetic image of the banknote, processed, and the scanning signal of the magnetic feature sensor for that parameter is simulated.

[0031] Specifically: the magnetic image of the banknote is denoted as I, with the shorter side as the height and the longer side as the length. mag (Determinant) Then the number of columns in the image is equal to the number of pixels C of the magnetic image sensor. image There are a total of C image Column. Let I be the total number of pixels in the nth column of the image. mag (:,n).

[0032] The process of simulating the magnetic feature sensor scanning signal by selecting intensity values ​​from the surrounding area of ​​the magnetic image column of the banknote is as follows:

[0033] The calculation requires obtaining the number of columns N. acq :

[0034]

[0035] Then when the simulated magnetic feature sensor is in the Nth... pos Magnetic feature signal X of column position scan sensor At that time, there were:

[0036]

[0037] The element E of the morphological dilation is a 1×41 matrix.

[0038] E = [1, 1…1, 1] (3)

[0039] Furthermore, the point spread function (PSF) of various magnetic feature sensors was obtained through experiments. sensor Assume the point spread function is a matrix with an equal and odd number of rows and columns. For magnetic feature sensors not recorded in the database, consider the point spread function (PSF). sensor The simulation was performed using a normal distribution function.

[0040] The simulated magnetic feature sensor scanning image I sensor_sim :

[0041]

[0042] In the formula: * represents image morphological dilation; * represents image convolution.

[0043] Indicates performing operations on the image Inverse image convolution.

[0044] D. Select a position on the long side to simulate the scanning signal of the magnetic feature sensor in multiple modes. Experts will select a suitable signal to complete the auxiliary design.

[0045] The magnetic image of the banknote will be displayed. mag Simulated magnetic feature sensor scanning image I sensor_sim .

[0046] Simultaneously, based on the selected position N... pos The column outputs three sets of signals, namely:

[0047] (1) Nth magnetic image of banknote pos Column magnetic characteristic signal I mag (:,N pos (See the comparison between analog and actual signals). Figure 3 .

[0048] (2) Simulated magnetic feature sensor at the Nth pos Magnetic feature signal X of column position scan sensor A comparison of analog and actual signals is shown in the figure. Figure 4 .

[0049] (3) Simulated magnetic feature sensor scan image I sensor_sim Nth pos Column magnetic characteristic signal I sensor_sim (:,N pos (See the comparison between analog and actual signals). Figure 5 .

[0050] Then the magnetic image of the banknote can be displayed. mag Simulated magnetic feature sensor scanning image I sensor_sim Select a suitable position for scanning on the long side; and based on 3 sets of signals (including 2 sets of analog values), finally confirm whether it is suitable and complete the auxiliary design. Figure 6 This is a schematic diagram illustrating the inconsistency between long-side and short-side scanning using a magnetic image sensor.

[0051] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. An auxiliary design method for a long-side banknote magnetic feature authentication module, characterized in that, include: Banknote A is fed along its long side, and its magnetic image is obtained by scanning along its short side using a magnetic image sensor. B sets the detection width, number of channels, and sensitivity of the magnetic feature sensor; C selects a series of intensity values ​​from the magnetic image column of the banknote to simulate the scanning signal of the magnetic feature sensor; morphological dilation of the structural elements in the long side direction of the banknote magnetic image is performed to simulate the scanning image of the magnetic feature sensor. D selects the long side of the banknote to simulate the magnetic feature sensor scanning signal in multiple modes, displays the banknote magnetic image, the simulated magnetic feature sensor scanning signal, and the simulated magnetic feature sensor scanning image, and confirms whether the three sets of signals can meet the counterfeit detection requirements, thus completing the auxiliary design of the long side banknote magnetic feature counterfeit detection module.

2. The auxiliary design method for the long-side banknote magnetic feature authentication module according to claim 1, characterized in that, Both the magnetic image sensor and the magnetic feature sensor are directional, and different banknotes require different scanning methods, thus obtaining different magnetic images and magnetic feature signals.

3. The auxiliary design method for the long-side banknote magnetic feature authentication module according to claim 1, characterized in that, In A: The magnetic image sensor scans along the short side, with the angular error controlled within ±10°. The detection width of the magnetic image sensor is B. image The number of channels is C image Sensitivity is S image .

4. The auxiliary design method for the long-side banknote magnetic feature authentication module according to claim 1, characterized in that, In B: The detection width of the target magnetic feature sensor is B sensor The number of channels is C sensor The sensitivity of the magnetic feature sensor is S. sensor .

5. The auxiliary design method for the long-side banknote magnetic feature authentication module according to claim 3 or 4, characterized in that, In step C, data is acquired from the magnetic image of the banknote, processed, and the detection width B is simulated. sensor Number of channels C sensor Sensitivity S sensor The scanning signal of the target magnetic feature sensor includes: The magnetic image of a banknote is denoted as I, with the shorter side as the height and the longer side as the length. mag Then the number of columns in the image is equal to the number of pixels C of the magnetic image sensor. image There are a total of C image Column; Let I be the total number of pixels in the nth column of the image. mag (:, n); The process of simulating the magnetic feature sensor scanning signal by selecting intensity values ​​from the surrounding area of ​​the magnetic image column of the banknote is as follows: The calculation requires obtaining the number of columns N. acq : （1） Then when the simulated magnetic feature sensor is in the Nth... pos Magnetic feature signal X of column position scan sensor At that time, there were: （2）。 6. The auxiliary design method for the long-side banknote magnetic feature authentication module according to claim 5, characterized in that, In step C, morphological dilation of the structural elements along the long side of the banknote magnetic image is performed to simulate the magnetic feature sensor scan image, including: The element E that exhibits morphological expansion is Matrix, N acq It is necessary to obtain the number of columns. Calculated from equation (1): （3） Furthermore, the point spread function (PSF) of various magnetic feature sensors was obtained through experiments. sensor Let the point spread function be a matrix with an equal and odd number of rows and columns; for magnetic feature sensors not recorded in the database, the point spread function (PSF) is... sensor The simulation is performed using a normal distribution function; The simulated magnetic feature sensor scanning image I sensor_sim : （4） In the formula: For image morphological dilation operations; For image convolution operations; Indicates performing operations on the image Inverse image convolution.

7. The auxiliary design method for the long-side banknote magnetic feature authentication module according to claim 6, characterized in that, The D includes: displaying the magnetic image of the banknote I mag Simulated magnetic feature sensor scanning image I sensor_sim ; Simultaneously, based on the selected position N... pos The column outputs three sets of signals, namely: (1) Nth magnetic image of banknote pos Column magnetic characteristic signal I mag (:, N pos ); (2) Simulated magnetic feature sensor at the Nth pos Magnetic feature signal of column position scan ; (3) Simulated magnetic feature sensor scanning image I sensor_sim Nth pos Column magnetic characteristic signal I sensor_sim (:,N pos ); Then experts can view the displayed magnetic image of the banknote I mag Simulated magnetic feature sensor scanning signal, simulated magnetic feature sensor scanning image I sensor_sim Select a suitable position for scanning on the long side; and based on three sets of signals, including two sets of analog values, confirm whether it is suitable and complete the auxiliary design.

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