JPH0277893A - Paper money discriminating device - Google Patents

Abstract

PURPOSE:To accurately discriminate the kind, genuineness, and/or deficient state of paper money by comparing the detected pattern of paper money which is stored in a detected pattern storage means with a reference pattern. CONSTITUTION:A CPU 7 decides whether or not the paper money B is fed slantingly and which of the left and right front ends of the paper money leads if the paper money B is fed slantingly according to detection data on the 1st column of the paper money B detected by an image sensor 2, and further the number of detection data in each column of the paper money B is detected based upon detection data on the paper money B detected by the image sensor 2. Then the detection data stored in a buffer memory 8a are stored in a detection pattern memory 8d according to the decision result so that the pattern is rectangular and the pattern of the stored detection data is compared with the reference pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a banknote discriminating device, and more specifically, the side of a banknote that should originally be conveyed parallel to the conveyance direction of the banknote is The present invention relates to a banknote discriminating device that can accurately determine the denomination, authenticity, and fitness of banknotes even when the banknotes are conveyed in a certain direction and at a certain angle.

Prior Art While the banknotes are conveyed along a conveyance path, the banknotes are transported by light.
The banknote is scanned in a direction perpendicular to the conveyance direction, and the light transmitted through the banknote or the light reflected by the banknote is photoelectrically detected by an image sensor to obtain a detection pattern. 2. Description of the Related Art A bill discriminating device is known that discriminates denomination, authenticity, and whether it is fit or not.

However, in such a banknote discriminating device, the reference pattern to be compared with the detected detection pattern is a pattern obtained by scanning the banknote parallel to the longitudinal direction or width direction of the banknote. When a banknote is conveyed, the side of the banknote that should normally be conveyed parallel to the banknote conveyance direction is conveyed at a certain angle to the banknote conveyance direction (hereinafter referred to as "diagonal feeding"). , it was not possible to determine the denomination, authenticity, and fitness of a banknote by comparing the detection pattern detected by an image sensor with a reference pattern after scanning the banknote in a direction perpendicular to the direction of conveyance. .

Moreover, it is extremely difficult to completely prevent such skewed feeding of banknotes, so in fact, in this type of banknote discriminating device, it is difficult to accurately determine the denomination, authenticity, and fitness of banknotes. I couldn't.

Therefore, for example, as disclosed in Japanese Patent Application Laid-Open No. 54-6437, when a banknote is skewed, the angle of skewed feeding is detected and the obtained detection pattern is corrected based on this angle. A bill discriminating device has been proposed that accurately determines the denomination, authenticity, and fitness of a bill by comparing it with a reference pattern.

Problems to be Solved by the Invention However, in such a device, it is necessary to provide a detection means for detecting the angle of diagonal feeding of banknotes, which inevitably increases the complexity of the device. Pattern correction is also usually done by rotating the obtained detection pattern data, which takes time and is not practical.

Purpose of the Invention The present invention uses a simple device and uses simple calculations to determine the denomination, authenticity and
It is an object of the present invention to provide a bill discriminating device that can accurately discriminate whether a bill is fit or not.

Structure of the Invention An object of the present invention is to provide a photoelectric detection means for photoelectrically detecting light transmitted through the banknote or light reflected from the banknote by scanning the banknote conveyed along a conveyance path with light; The detection pattern of the banknote obtained based on the amount of transmitted light of the banknote or the light reflected from the banknote detected by
Detection of at least one row of banknotes photoelectrically detected by the photoelectric detection means in a banknote discrimination device comprising a banknote discrimination means for determining the denomination, authenticity, and fitness of the banknote by comparing with a reference pattern. a detection data storage means for temporarily storing data; and a detection data storage means for detecting the number of data of each column of banknotes stored in the detection data storage means, and a first column of banknotes stored in the detection data storage means. a control means for detecting the conveyance state of banknotes based on the detection data of the banknotes; a data number storage means for storing the number of data in each row of banknotes detected by the control means; A banknote conveyance state storage means for storing a conveyance state, and a detection pattern storage means for storing a detection pattern of a banknote based on the detection data of the banknote stored in the detection data storage means, Based on the number of data of each row of banknotes stored in the number storage means and the transport state of the banknotes stored in the banknote transport state storage means, the detection data of the banknotes stored in the detection data storage means is calculated.
This is achieved by a banknote discriminating apparatus characterized in that the detected pattern storage means stores the data in such a manner that the pattern shape is rectangular.

In a preferred embodiment of the present invention, the control means determines whether or not the banknote is being fed diagonally, and if the banknote is being fed diagonally, which of the front left edge and the front right edge of the banknote is leading. It is configured to determine whether the banknotes are being fed and to store the determination result in the banknote conveyance state storage means.

Effect of the Invention According to the present invention, the control means determines whether or not the banknote is being fed diagonally based on the detection data of the first row of banknotes, and when it is detected that the banknote is being fed diagonally, the right front end of the banknote is placed first. or whether the left front end of the banknote is leading, the banknote conveyance state storage means stores the detection data of each row of banknotes in the detection data storage means, and the detection data of each row of banknotes is stored in the detection data storage means. Detects the number of detection data and stores it in the data number storage means, and calculates the number of detection data for each row of banknotes stored in the banknote transport state stored in the banknote transport state storage means and the data number storage means. Therefore, the detection data of each row of banknotes stored in the detection data storage means is rearranged so that the pattern becomes a rectangular shape.
Since the detection pattern is stored in the detection pattern storage means, even when a banknote is skewed, the banknotes stored in the detection pattern storage can be detected without requiring a detection means for detecting the angle of skew feed of the banknote. By simply comparing the pattern with a reference pattern, it is possible to accurately determine the denomination, authenticity, and/or fitness of a banknote.Additionally, complex calculations such as rotating and correcting detected data are also required. Therefore, it becomes possible to correct the detection data of the banknotes in a short time, and it is possible to obtain an extremely practical and highly accurate banknote discrimination device.

EXAMPLES Hereinafter, examples of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a block diagram of a banknote discriminating device according to an embodiment of the present invention.

In FIG. 1, a light source 1 irradiates a banknote B with light in a rectilinear manner, as the banknote B is conveyed along a conveyance path by a conveyance means (not shown) such that its short side direction is parallel to the conveyance direction of the banknote. The image sensor 2 installed on the opposite side of the light source 1 scans each pixel along a line perpendicular to the transport path.
The amount of light transmitted through banknote B is read photoelectrically and converted into an analog signal. 3 is a lens. Then, as a result of the banknote B being conveyed along the conveyance path at a predetermined speed across the image sensor 2, the transmitted light amount detection data for all pixels of the banknote B are read by the image sensor 2 and converted into analog signals. Ru. The detection signal of the banknote detected by the image sensor 2 is
For each scan, that is, for each column, the signal is output to the amplifier 4 and amplified, further converted into a digital signal by the A/D converter 5, and sent to the bus 6. bus 6
The digital signals of the banknotes B inputted to the banknotes B are stored in the RAM 8 column by column by the CPU 7 . Here, when the image sensor 2 does not detect the bill B, the output of the image sensor 2, and therefore the output of the A/D converter 5, is set to be zero.

Reading data of banknote B by image sensor 2, A
The conversion of the analog signal for each column into a digital signal by the /D converter 5 and the storage of the digital signal for each column in the RAM 8 by the CPU 7 are carried out by the drive circuit 9 to the image sensor 2, A/Dll unit 5 and CP' Its timing is controlled by a timing signal output to U7.

The RAM 8 is a buffer memory 88 that stores detection data of one row of pixels of the banknote B detected by one scan of the image sensor 2, and updates the stored values one after another.
A data number memo that stores the number of pixel detection data for one column calculated by the CPU 7 based on the detection data when storing the pixel detection data for 11 columns in the buffer memo j18a! J8b, when storing the detection data for one row of pixels in the buffer memory 8a, the CPU 7 detects the conveyance state of the banknote, that is, whether the banknote B is being fed diagonally or not, based on the detection data. , and from the buffer memory 8a and the banknote conveyance state memo IJ8C that stores which of the right front end and the left front end is being fed first when the banknotes are being fed diagonally.
A memory that receives detection data for each row and stores the detection pattern of banknote B, and stores a pattern of detection data corrected by the CPU 7 when the CPU 7 determines that skew feeding has occurred. Pattern memo IJ 8
It has d.

Here, when the two sides of the banknote B that should originally be conveyed parallel to the banknote conveyance direction are conveyed parallel to the banknote conveyance direction, that is, when the banknote B is conveyed normally,
The number of detection data for one column of banknotes B detected by the image sensor 2 and stored in the buffer memo U 8 a by one scan of the image sensor 2 is always constant. Therefore, the number of detection data for one row of banknotes B stored in the data number memo U 8 b also always has a constant value, and the value is determined by the denomination of banknote B. On the other hand, when the banknote B is conveyed and the banknote B is skewed as shown in FIG. The number of data is smaller than the number of data in the first column of the reference pattern for any denomination.

Therefore, based on the detection data of the first column of banknote B,
It is possible to determine whether the banknote B is being fed diagonally.

Further, in FIG. 2, if the banknote B is scanned from left to right by the image sensor 2, and the left front end of the banknote B is fed in advance as shown in FIG. The detection data of the first column detected by 2 and stored in the buffer memory 8a of the RAM 8 is as follows.
Initially, the detection data is zero, and then the detection data of non-zero values smaller than a predetermined value determined for each denomination is stored, and again,
However, the interval where the detected data is zero is shorter at the beginning and longer at the end. Therefore, based on the detection data of the first row of banknotes B, it can be determined which of the right front end and the left front end of banknote B is being fed diagonally first.

In this way, the CPU 7 determines whether or not the banknote B is being fed diagonally according to the detection data of the first row of banknotes B, and when the banknote B is being fed diagonally, which of the right front end and the left front end comes first. It is determined whether the banknotes are being fed diagonally and manually inputted into the banknote conveyance state memory 8C of the RAM 8.

Reference numeral 10 denotes a ROM that stores a control program for the banknote discriminating device, a reference pattern for each denomination of banknotes, a reference pattern for determining the fitness of each denomination of banknotes, and each denomination when banknote B is being conveyed normally. The number of data for one column is stored.

In the banknote discriminating device according to the present embodiment configured in this way, as shown in FIG. The number of detection data for one column of banknotes B detected by the image sensor 2 by one scan of the sensor 2 and stored in the buffer memo U 8 a, that is, the detection data of the banknote B stored in the data number memo 1J8b The number gradually increases in interval 1, remains constant during interval 2, and gradually decreases in interval 3. And buffer memo U 8 of RAM 8
The detection data of the banknote B to be stored in the bus 6 is as shown in FIG.
It is human-powered, and then it becomes zero again. Since the number of pixels in which the detection date of the exit is stored is larger in the latter half, the CPU 7 determines that the banknote B is being fed diagonally with the front left edge leading. Then, the detection data for the first column is stored in the buffer memo U 8 a, and a message indicating that the left front end of the banknote B is being fed diagonally in advance is entered in the banknote conveyance state memory 8c. At the same time, C
The PU 7 manually inputs the data number "'3" into the data number memory 8b as the number of detected data for the first column.

In this way, after manually inputting the detection data of the first row of banknotes B into the buffer memo U 8 a, the CPU 7 reads the transport state of banknote B from the banknote transport state memory 8-c. Then, as shown in FIG. 2, when the front left end of the banknote B is being fed obliquely, the CPU 7 converts the detection data of the first column stored in the buffer memory 8a into a detection pattern. The data are sequentially stored in the first column of the memory 8d starting from the left end as shown in FIG. In Figure 4,
The first to third detection data are sequentially stored in the first column of the detection pattern memo U 8 d from the left end.

Next, when the detection data of the second column is manually inputted to the bus 6, the CPU 7 reads out the conveyance state of the banknote B from the banknote conveyance state memo 1J8c, and also stores it in the data number memory 8b.
Enter the number of data in the second column ``'7''' and note the number of data I.
Compare with the number of data in the first column stored in J8b. In the case of Figure 3, the number of data in the second column is greater than the number of data in the first column, so out of the detected data in the second column, there are three The detected data is sequentially stored in the second column of the detection pattern memory IJ8d from the left end, and the detected data in the second column that exceeds the data number "3" in the first column is stored in the second column of the detection pattern memory 8d. Following the detection data of the first column of banknotes B stored in the first column, the data is sequentially stored in the first column from the left end. In Fig. 4, the number of detected data in the first column is ``3''.
three detection data equal to, i.e., the fourth to sixth
The second detected data is the second detected pattern memo 1J8d.
The four detected data in the second column that exceeds the number of data in the first column "3", that is, the seventh to tenth
The first detected data is the first detected pattern memo 1J8d.
Following the third detection data stored in the column, the detection data is stored sequentially from the left in the first column.

As a result, the first column of the detection pattern memory 8d stores a number of data equal to the number of detection data of the second column of banknotes B detected by the image sensor 2, and the second column The number of data equal to the number of detection data of the first row of banknotes B detected by the image sensor 2 is stored.

Furthermore, when the detection data of the third column is manually inputted to the bus 6, the CPU 7 reads the conveyance state of the banknote B from the banknote conveyance state memory 8c, and also writes the data into the data number memory 8b.
The number of data in the third column is manually entered and compared with the number of data in the second column stored in the data number memory 8b. In the case of Figure 3, the number of data in the third column is greater than the number of data in the second column, so out of the detected data in the third column, the number of detected data equal to the number of detected data in the first column is The data in the third column is sequentially stored in the third column of the detection pattern memo 1J8d from the left end, and the data in the third column that exceeds the number of detection data in the first column is stored in the second column of the detection pattern memo U8d. Following the sixth detection data, the second column is stored sequentially from the left, and the detection data in the third column that exceeds the number of detection data in the second column is stored in the first column of the detection pattern memo 1J8d. Following the tenth detection data stored in the column, the data is sequentially stored in the first column from the left. In FIG. 4, among the detection data in the third column of banknote B detected by the image sensor 2, the 11th to 13th detection data are from the left end of the third column of the detection pattern memo 'J8d. The 14th to 17th detection data are sequentially stored from the left following the 6th detection data in the second column of the detection pattern memo U8d, and the 18th to 20th detection data are stored sequentially from the left. The detection data is in the detection pattern memo U 8.
The data are sequentially stored from the left following the 10th detection data in the first column of d.

As a result, the first column of the detection pattern memory 8d has a number of data equal to the number of detection data of the third column of the banknote B detected by the image sensor 2, and the second column has data equal to the number of data detected by the image sensor 2. The number of data equal to the number of detection data of the second column of banknote B detected by 2 is also
In the third column, banknotes B detected by the image sensor 2 are shown.
A number of pieces of data equal to the number of pieces of detected data in the first column of are respectively stored.

In this way, when the number of detected data is within the detection interval Kl where the number of detected data gradually increases, the detected data of the j-th column (i is a positive integer) of the banknote B detected by the image sensor 2 is the first column. First, the number is stored sequentially from the left end in the first column of the detection pattern memo 'J8d until the number is equal to the number of detection data of the eyes, and then the number is stored sequentially from the left end until the number is equal to the number of detection data of the second column of banknote B. Detection pattern memory 8
The detected pattern memo U8 is stored in the (i-j)th column of d (J is a positive integer, and J<1). , the (j+1)th banknote B
The detection data of the first column of banknote B is stored until the number becomes equal to the number of detection data of the column.

By repeating such detection and storage, the detection data of the banknote B is stored in the detection pattern memo IJ8d, and the detection section of the banknote B is in the 1st column (k is a positive integer, k>i). ), and the detection in section 1 is completed, the detection data in the 1st column is the detection pattern memo IJ 8
d, the number of detection data equal to the number of detection data of the first column of banknote B is stored in the detection pattern memory 8.
In the first column of banknote B, a number of detection data equal to the number of detection data in the (k-1> column) of banknote B is stored in the detection pattern memory 8.
In the second column of d, the number of detection data equal to the number of detection data in the (k-2)th column of banknote B is the detection pattern memo U.
8 d, and so on, respectively, and the (k-fl)th column of banknote B (β is a positive integer, k>A
) is stored in the (A+1)th column of the detection pattern memo U 8 d.

Therefore, when the detection period ends with 1 in the first column and the detection data of the first column of banknote B is stored in the detection pattern memory 8d, the first column of the detection pattern memo IJ8d has the following information: The number of detection data equal to the detection data of the first column, that is, as is clear from FIG. 2, the maximum number of detection data is stored as the detection data of one column of banknote B. . Therefore, the next (k +1
) column, it is no longer stored in the first column of the detection pattern memo U 8 d, but when the storage in the second column is completed, the storage of the detection data is completed. , while the detection interval is in interval 2, the detection data of the m-th column (m is a positive integer, m > k) of banknote B is equal to the number of detection data of the first column of banknote B. The detection pattern memo IJ 8 d is sequentially stored in the m-th column of the detection pattern memory 8 d from the left end until the detection pattern memory 8 d
(n is a positive integer, and n<k).

), the detection data of the m-th column of banknote B continues after the detection data of the (m-1)th column until the number becomes equal to the number of detection data of the (n+1)-th column of banknote B, They will be stored sequentially from the left.

Then, in the p-th column (p is a positive integer, 92 m), if the interval shifts to 3, the detection data of the p-th column of banknote B detected by the image sensor 2 will be in the second column. The detection data in the (p-1)th column of the detection pattern memory 8d is sequentially stored from the left, following the detection data in the (p-1)th column, until the number is equal to the number of detected data. The detection data of the pth column of banknote B that exceeds the number of detection data is
The (p-th)th column is stored in the (p-2)th column of the detection pattern memory 8d until the number becomes equal to the number of detected data in the third column of the detection pattern memory 8d.
2) Following the detection data in the column, the data is stored sequentially from the left,
Detected pattern memo IJ 8 d's (p)
−q) column (q is a positive integer, q<k) until it becomes equal to the number of detected data in the (Q+1)th column of banknote B.
The detection data of the p-th column is stored.

In this way, while the detection interval is in interval 3, the detection data of the (p+r)th column (r is a positive integer) of banknote B is the (
r+s) column (S is an integer of 2 or more) until the number is equal to the number of detected data in the detected pattern memory 8d.
In the (p-s + 1)th column of banknote B, the (p+r
-1) Following the detection data of the column, the data is stored sequentially from the left.

As described above, when data is detected by the image sensor 2 over the entire surface of the banknote B, a rectangular pattern as shown in FIG. 4 is stored in the detection pattern memory 8d. The pattern of detection data stored in this detection pattern memo 'J8d is rectangular like the actual banknote B, as shown in FIG. Unlike the length L1 width W,
Assuming that the oblique feeding angle of the banknote B is θ, its length is L/cos θ, and its width is Wcos θ.

In the above description, only the case where the banknote B is fed obliquely with the left front end leading, but the banknote B
is fed diagonally so that the front right end is in front, the detected data is stored in the detected data memory 8d by the CPU so that the left and right sides are reversed as described above.
Processed by 7.

Moreover, the banknote B is conveyed parallel to the conveyance direction of the banknote B,
If the banknotes are not being fed diagonally, the banknote conveyance status memo IJ
8c stores that the conveyance state is normal, so the CPU 7 writes the detection data stored in the buffer memory 8a one column at a time to the detection data memo U8d without performing any special processing. Then, the data is stored sequentially starting from the first column.

In this way, when the detection of the pattern of one banknote B is completed, the CPU 7 stores the detected pattern memo U 8 d in the RAM 8.
reads out the stored detection pattern of the banknote B from the ROM10, reads the reference pattern from the ROM10, compares the two, and determines the denomination, authenticity, and fitness of the banknote B;
The results are output to display means (not shown).

Here, as mentioned above, when skew feeding occurs, the pattern of detection data stored in the detection pattern memo IJ8d has a rectangular shape as shown in FIGS. 4 and 5. Therefore, by comparing each row with the reference pattern, it is possible to determine the denomination, authenticity, and fitness of the banknote B.

However, as shown in FIG.
Although the detection pattern data stored in d has a rectangular shape, its length and width are different from the length and width of the actual banknote B, so the detection pattern memo 1J8d
Although the detection pattern data of each column stored in the memory does not perfectly match the pattern of each column of the reference pattern, when determining the denomination, authenticity, and fitness of banknote B, there is a tolerance range. Even if the detected pattern does not completely match the reference pattern, if the detected pattern matches the reference pattern in a predetermined portion or more, it is determined that the detected pattern is a genuine note of a certain denomination. Therefore, such discrepancy does not affect the discrimination accuracy of banknote B.

According to this embodiment, the CPU 7 determines whether or not the banknote B is being fed diagonally, and when the banknote B is being fed diagonally, based on the detection data of the first row of banknotes B detected by the image sensor 2. Determining which of the left front end and the right front end of the banknote is in front, and further detecting the number of detection data in each column of the banknote B based on the detection data of the banknote B detected by the image sensor 2, According to these determination results, the detection data stored in the buffer memo U8a is
The banknote B
Since it is possible to accurately determine the denomination, authenticity, and fit/failure of banknotes, there is no need to separately provide a means to detect the angle of diagonal feeding of banknote B, and there is no need to use complicated methods such as rotating data. There is no need for calculations, so even when banknotes B are skewed, the denomination, authenticity, and fitness of banknotes B can be determined with high accuracy by simple calculations, and the system has a simple structure. It becomes possible to provide a banknote discrimination device.

It goes without saying that the present invention is not limited to the above embodiments, but can be modified in various ways within the scope of the invention described in the claims.

For example, in the embodiment described above, the image sensor 2 photoelectrically detects the transmitted light of the banknote B, but it may also photoelectrically detect the reflected light of the banknote B.

In the embodiment described above, the light source 1 irradiates the banknote B conveyed along the conveyance path with light in a line, and the image sensor 2 detects the banknote B for each pixel along the line perpendicular to the conveyance path. The light source 1 scans the bill B in dots along a line perpendicular to the conveyance path, and the transmitted light or reflected light of the bill B is photoelectrically detected by the image sensor. Alternatively, the detection may be performed in a specific manner.

Furthermore, in the embodiment, the buffer memory 8a stores only the detection data for one row of banknotes B detected in response to one scan of the image sensor 2, and the memory is updated every time one row is detected. is configured to be
It goes without saying that any device that can store at least one column of detection data may be sufficient, and may also be one that can store two or more columns of detection data.

Effects of the Invention According to the present invention, by using a simple device and simple calculation, even when a banknote is skewed, the denomination and the denomination of the banknote can be determined.
It becomes possible to provide a banknote discriminating device that can accurately determine authenticity and fitness.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a banknote discriminating device according to an embodiment of the present invention. FIG. 2 is a schematic plan view showing the conveyance state of banknotes. FIG. 3 is a drawing showing detection patterns of banknotes read by an image sensor. FIG. 4 is a drawing showing patterns of detection data of banknotes stored in the detection pattern memory. FIG. 5 is a drawing showing the shape of a pattern of banknote detection data stored in a detection pattern memory. ■...Light source, 2...Image sensor, 3...Lens, 4...Amplifier, 5...
...A/D converter, 6...Bus, 7...CPU
, 8...RAM. 8a...Buffer memory, 8b...Data number memory, 8C...Banknote transport state memory, 8d...Detection pattern memory,

Claims (2)

[Claims] (1) A photoelectric detection means that scans the banknotes conveyed along the conveyance path with light and photoelectrically detects the transmitted light of the banknotes or the light reflected from the banknotes, and the transmission of the banknotes detected by the photoelectric detection means A bill discriminating device that includes a bill discriminating means that compares a bill detection pattern obtained based on the amount of light or reflected light from a bill with a reference pattern to determine the denomination, authenticity, and integrity of the bill. , a detection data storage means for temporarily storing detection data for at least one row of banknotes photoelectrically detected by the photoelectric detection means; a control means for detecting the number of banknotes and the conveyance state of the banknotes based on the detection data of the first row of banknotes stored in the detection data storage means; a data number storage means for storing the number of data; a banknote transport state storage means for storing the transport state of the banknote determined by the control means; a detection pattern storage means for storing a detection pattern of the number of banknotes stored in the data number storage means and a detection pattern storage means for storing a detection pattern of the banknotes, the control means controlling the number of data of each row of banknotes stored in the data number storage means and the banknote transport state stored in the banknote transport state storage means. A bill discriminating device characterized in that, based on a state, the detection data of the bill stored in the detection data storage means is stored in the detection pattern storage means so that the pattern shape is rectangular. (2) The control means determines whether diagonal feeding of banknotes is occurring and, when diagonal feeding is occurring, whether the left front end or right front end of the banknote is being fed first. Claim (1) characterized in that it is configured to perform a determination and store the determination result in the banknote conveyance state storage means.
).