JPS5911952B2 - Printed matter pattern identification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a banknote pattern identification device for identifying the authenticity and type of banknotes based on their printing patterns.

The following five methods can be used to identify the authenticity and type of banknotes. In other words, the brightness of the printed pattern, which is the standard for comparison of banknotes, is set at a certain standard level, and if it is brighter than this level, the printed pattern is represented by logic ``1'', if it is darker, it is logical ``o'', and the printed pattern is expressed as a comparison standard. The lightness of the banknote to be compared is read at step 10, and the signal read by the lever is quantized using the standard level of the comparison standard and the equivalence condition described above to output a logic ``1'' and ``0'' signal. This is a method of comparing signals between the printed pattern of the read banknote and a reference pattern for comparison.

15 According to this method, the reference level at which the printed pattern of the banknote to be identified is read and quantized into binary logic fluctuates due to variations in component characteristics, so the brightness of the printed pattern near the reference level is logical ``1''. In addition, the banknotes are unstable and often mismatched when compared with the standard pattern for comparison, which has the disadvantage that even genuine banknotes can be identified as counterfeit banknotes.

Furthermore, regarding the brightness of the printed pattern at the creases of banknotes, the logic signal becomes unstable in the same way as described above, resulting in the same drawback as in case 5.

Therefore, as mentioned above, the present invention has been developed to maintain the signal between the read print pattern and the reference pattern even if the reference level for reading and quantizing the print pattern changes slightly, or even if the brightness of the crease of the banknote is not clear. It is an object of the present invention to provide a banknote pattern identification device that can obtain accurate identification with extremely high reliability of the 30 comparison results.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below regarding a banknote pattern identification device for identifying the authenticity and type of banknotes used in money changers and the like.

1 and 2 show a detection unit for a banknote 1. The banknote 1 is inserted into the insertion slot 2, and the banknote 1 is detected by the first photoelectric detector 3 provided inside the insertion slot 2. The upper and lower conveyor belts 4, 4 are driven by appropriate motors to carry the inserted banknotes 1.
Take it inside.

A sensor unit 5 that optically reads the printed pattern of the banknote 1 is provided at the center position in the width direction of the conveyor belts 4, 4, and the sensor unit 5 is located on both sides of the banknote 1 and the distance between them is set to the minimum width of the banknote type. Make it slightly shorter than the dimension, and make the second
A photoelectric detector 6 and a third photoelectric detector 7 are provided. These detectors 6 and 7 detect the banknote 1 at the same time to detect that the inserted banknote 1 satisfies the minimum width dimension.\The timing when the banknote 1 is present on the sensor unit 5 Detect.

In this embodiment, the sensor unit 5 is an optical reading means that reads the brightness and darkness of the printed pattern using a photoelectric element.
It is also possible to use magnetic components of the printed pigments of the printed pattern, or magnetic reading means that magnetize the printed pattern and read the residual magnetism of the pigments.

FIG. 3 shows a control circuit, in which the drive control command signal for driving the conveyor belts 4, 4 by the first photoelectric detector 3 is input as one of the gate conditions of the AND gates 8, 9, and the second
, the output signal of the AND gate 10 which is inputted from the third detectors 6, 7 and produces an output is also inputted as one of the gate conditions of the AND gates 8, 9. For this purpose, the oscillator 11
The pulses output from the counter 12 are input to the counter 12 and counted, and this counting is performed while the second and third detectors 6 and 7 are detecting the banknote 1. Therefore, the calculated value of the counter 12 is the banknote 1. The length data is output from the AND gate 13 controlled by the read timing signal.

When the AND gate 9 satisfies the gate conditions, the analog signal from the sensor unit 5 that reads the brightness of the printing pattern on the banknote 1 is passed through the AND gate 9 to the quantization circuit 1.
4 and is converted into a digital signal of '1' and '0' above and below the reference level.

The quantized print pattern signal is controlled by the clock signal and stored in the register 15, the stored signal becomes print pattern data, and the print pattern data is output from the AND gate 16 controlled by the read timing signal. be done.

The timing circuit unit 18 outputs a read timing signal and a clock signal to operate the AND gates 13 and 1 described above.
In addition to performing gate control of 6 and store control of register 15, store control of storage device 19 is also performed.

The storage device 19 includes a program area 20 that determines the order of operations, a flag area 21 that determines the type of banknote 1 based on the length and printing pattern of the banknote 1, and the counter 12 described above.
A reading data area 22 stores the length data and print pattern data inputted from the register 15; a reference length data area 23 for various banknotes obtained by measuring in advance for comparison; In addition to the reference pattern data area 24 of . It includes an address register 25 and a data register 26.

Figure 4 shows the read data area 22 and the reference length data area 2.
3 and the reference pattern data area 24, where 4 hits correspond to 1 digit of data.

The read data area 22 stores length data A and print pattern data B, the length data A represents the banknote length by 4 digits, and the print pattern data B is n
The brightness and darkness of the print pattern is determined by digits (1″0).
It is expressed by ``.

The standard length data area 23 measures the length of various banknotes in advance and stores data on the upper and lower limits of the length, where C is the length data of the 1,000 yen bill, C1 is the upper limit data, and C2 is the lower limit. The data D is the length data of a 5,000 yen bill, d1 is its upper limit data, D2 is its lower limit data, E is the length data of a 10,000 yen bill, e1 is its upper limit data, and E is its lower limit data.

Length data A of the previous reading data area 22, reference length data C of various banknotes in the reference length data area 23,
The comparison with D and E is controlled by the control device 17, and the read banknote length data A is within the upper and lower limits of any of the standard length data C-E using a calculation unit built into the control device 17. A comparison is made to see if it will fit, and if there is a corresponding banknote type, a flag for that banknote type is set in a flag area 21. The reference pattern data area 24 optically measures the brightness and darkness of the printed patterns of various banknotes in advance, and parts where brightness and darkness are clearly identified are identified by a comparison signal of logic ``1'' and ``O''. Areas of perfect intermediate brightness and, if desired, areas where the clear distinction between brightness and darkness may be impaired by creases, etc., are identified by a dummy signal of logic '2'', and this dummy signal of logic '2'' The portions are excluded from comparison, and the reference pattern is eventually composed of ternary signals. In the reference pattern data area 24, F is the reference pattern data of the 1,000 yen bill, G is the reference pattern data of the 5,000 yen bill, and H is the reference pattern data of the 10,000 yen bill. It has type data F, g, h.

The comparison between the print pattern data B of the banknote read in the previous read data area 22 and the standard pattern data F, G, H of various banknotes in the standard pattern data area 24 is controlled by the control device 17. A calculation unit built in the banknote 17 performs a comparison calculation to determine whether the printed pattern B of the banknote read corresponds to any of the reference patterns F-H.

In this comparison calculation, the reference pattern data F~HO)S
The comparison operation is prohibited for the data excluded from the comparison of 2l, and the comparison operation is performed only with the other data of "1" and "0".

When the match criterion for banknote identification is set to 95% or more and the result of the comparison calculation is 95% or more, input the banknote type data f to h of the standard pattern data FH into the flag area 21 and select the Flag banknote types.

In the flag area 21, the calculation unit of the control device 17 compares and calculates whether the banknote type flag based on the previously input and stored length data matches the banknote type flag based on the pattern data, and when they match, the flag area 21 The banknote type of the raised flag is output as a recognized banknote type signal.

In addition, in the comparison calculation of the reference pattern data F-H mentioned above, the data of the reference pattern data F-H(17)ゝ2'' is compared, and the print pattern data B side to be compared is S.
It is also possible to output a match signal regardless of whether it is 1"SO" or 1"SO".

In this case, the match criterion is 970! ) It is preferable to set a high matching criterion as above.

In addition, in cases where the influence of dirt, creases, etc. can be ignored, such as when the printed pattern is determined by detecting the magnetic component of the printing pigment or the residual magnetism after magnetization, the above-mentioned match criterion should be literally 100%. , and the identification accuracy improves accordingly.

Further, in the above embodiment, the quantized signal of the print pattern is binary, but it may be, for example, ternary. At this time, if the 3 values read and quantized are 0, 1, 2, the reference pattern is set with comparison signals 0, 1, 2 and dummy signals 3, 4, and dummy signal 3 is a quantum signal is 0
, 1, and dummy signal 4 is considered to be a match when the quantized signal is either 1 or 2. In addition, when a new banknote is issued due to denomination, according to the embodiment of the present invention, it is only necessary to replace the reference data in the areas 23 and 24.

As shown in the embodiments above, according to the present invention, the reference pattern setting means sets dummy signals for parts of the banknote pattern where it is difficult to clearly identify the pattern, and stores the reference pattern of at least three-value signals. Therefore, for example, for areas where the brightness judgment becomes unstable due to creases such as the four-fold or two-fold parts of banknotes, a dummy signal can be set in advance in the reference pattern, and it can be used to detect inconsistencies when comparing patterns. Therefore, even if the brightness/darkness judgment near the reference level in the quantization means becomes unstable due to component characteristics or temperature changes, it is possible to detect the true value by reading the banknote pattern corresponding to the above-mentioned dummy signal part. Banknotes will no longer be judged as counterfeit banknotes. To be more specific, for example, black,
In order to determine the binary value of white, the three values of black, white, and gray, which is an intermediate color, are set as a reference pattern, and in the case of gray, it is excluded from the comparison determination. must be quantized into three values: black, white, and gray.During this quantization, depending on component characteristics and temperature changes, parts near the reference level may be judged as gray, and parts to be quantized may be marked as black. There is a drawback that it is judged and quantized, and conversely, it is judged as white and quantized, and in this case, the gray part is judged as black or white and becomes the subject of comparison judgment,
Due to this determination, there is a possibility that incorrect banknotes will be identified. However, in the case of the present invention, the above-mentioned gray part, that is, the difficult-to-identify part, is set as a dummy signal in the reference pattern in advance, so even if the above-mentioned gray part is quantized as black or white, it will not be detected as a mismatch in the comparison judgment. This eliminates the possibility of misidentifying banknotes due to the reading of difficult-to-identify parts, and provides extremely high reliability in comparison results to ensure reliable banknote identification. For example, if it is a binary judgment of black and white, it is sufficient to configure a quantization means corresponding to these two values, and there is no need to configure a quantization means for the intermediate color gray, making the configuration simple. be converted into

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the banknote detection section, FIG. 2 is a plan view thereof, FIG. 3 is a control circuit block diagram, and FIG. FIG. 2 is an explanatory diagram showing a data store. DESCRIPTION OF SYMBOLS 1... Banknote, 5... Sensor unit, 14... Quantization circuit, 15... Lujistor, 17... Control device, 23... ...Reference length data area, 24...Reference pattern data area.

Claims (1)

[Claims] 1 A pattern identification device that reads a banknote pattern and identifies a banknote by comparing the read pattern with a preset reference pattern, the quantization means comparing the read pattern with a reference level and determining at least 2 the reference pattern setting means stores a reference pattern of at least three-value signals by setting dummy signals for portions of the banknote pattern that are difficult to clearly identify;
A banknote pattern identification device, wherein the comparing means compares each signal of the quantized pattern with each signal of the reference pattern to determine whether or not they match, and at least does not determine whether or not they match with respect to the dummy signal.