JP2792703B2 - Paper sheet identification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention; (Industrial Application Field) The present invention relates to a paper sheet identification apparatus for identifying paper sheets such as banknotes by a pattern matching method.

(Prior Art) As shown in FIG. 8, a conventional banknote recognition device reads a magnetic pattern and / or an optical pattern of a banknote 1 by sensors SN1 to SN3 disposed on a banknote transport path, and reads the length and width of the banknote. , The denomination of the banknote 1 is determined for the time being based on the characteristics of the pattern and the like, and reference data for each denomination set in advance based on the determined denomination are shown in FIGS. 9 (A) and 9 (B). The denomination and the authenticity are determined according to the most characteristic pattern of the denomination. That is, P1 to P3 in FIGS. 9A and 9B are sensors SN1 to SN, respectively.
The read data of N3 is shown in correspondence with the bill position, and the bill data 1A of denomination A in FIG.
The discrimination is performed by D2 and D3, and the discrimination is performed by the zone data D4 and D5 for the banknote 1B of denomination B in FIG.

(Problems to be Solved by the Invention) In the above-described banknote recognition device, the data zone used for discrimination differs for each denomination, and the discrimination formula for discrimination also differs. For this reason, the operation of each denomination cannot be performed in common, and the efficiency of the identification operation is low. In addition, it takes a lot of skill to create the judgment formula, and the judgment formula varies depending on the person who makes the judgment formula, and it takes a lot of time to prepare the judgment formula. Furthermore, since the detected magnetic pattern or optical pattern is determined by comparing it with reference data registered in advance, the detection must be performed accurately.
The optical system must necessarily be an imaging system. For this reason, there has been a problem that the adjustment of the optical system and the like become complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to identify a paper sheet pattern by comparing it with a reference pattern, and to determine a judgment formula and a comparison procedure for each denomination. An object of the present invention is to provide a paper sheet identification apparatus in which the identification operation is simplified and universalized by using the same.

(Means for Solving the Problems) The present invention relates to a paper sheet identification apparatus configured to convey paper sheets on a conveyance path in response to a drive pulse and to identify the paper sheets. The object of the present invention is to provide a detection sensor for detecting a pattern of the paper sheet, a storage unit for storing a value related to an output signal of the detection sensor as detection data corresponding to the drive pulse, Average value calculation means for calculating an average value of data stored in the storage unit,
A gray value calculating means for calculating a difference between the average value and the data calculated by the average value calculating means as a gray value, and a sum value of the respective gray values calculated by the gray value calculating means is obtained. A normalizing unit that divides each of the grayscale values to obtain a grayscale intensity arrangement pattern of a portion detected by the detection sensor; a comparison unit that compares the grayscale intensity arrangement pattern with a predetermined reference pattern; This is achieved by providing a discriminating means for discriminating the paper sheet based on the comparison result obtained by the means.

(Operation) In the present invention, the entire magnetic pattern or optical pattern of a paper sheet is registered as a reference pattern for each denomination,
After processing the read data, a detection pattern is created and compared with a reference pattern to identify a sheet. In identifying the paper sheet, the same processing is performed for each type of paper sheet, and the same arithmetic expression is used. Further, the reading of the optical pattern of the paper sheet may be a non-imaging system, and a combined optical / magnetic sensor (hybrid sensor) and a light transmission type (or light reflection type) sensor are used as detection sensors for identification. It is done using.

(Embodiment) FIG. 1 shows the appearance of a bill validator according to the present invention, in which a placing table 10 for placing a bill 1 in a predetermined direction and taking it in is provided. Is provided with an operation unit 11 for inputting an instruction or the like.

2 (A) and 2 (B) show an example of the arrangement of the banknote 1 taken in and conveyed inside and various sensors.
1 is a plan view, and FIG. 1B is a side view thereof. A light-transmissive insertion detection sensor SN10 is provided at the entrance of the bill 1 from the mounting table 10.
, And SN11 are provided, and a light-transmitting type passage sensor SN12 and a color sensor SN13 are provided at the rear thereof.
A transmitted light sensor is used for the passage sensor SN12, which is used to take a timing to start collecting data of a detection signal of each sensor, and simultaneously detects two bills and also detects a transmission type optical pattern. I have. Color sensor SN13
Is a pair of transmitted light sensors consisting of a light emitting unit that synthesizes light of two different wavelengths and two light receiving units corresponding to the light emitting unit, and detects a color pattern of a banknote based on a light receiving ratio of light of two wavelengths. Has become. In addition, 61-1257
There are provided four hybrid sensors SN20 comprising a magnetic sensor and a light reflection type optical sensor as disclosed in Japanese Patent Publication No. 64, and detects an optical reflection pattern and a magnetic pattern at the same position of the bill 1, respectively. ing. Furthermore, a passage detection sensor SN that detects passage to a storage unit (not shown)
14 are provided. As described above, this device detects the light transmission pattern, reflection type pattern, color pattern, and magnetic pattern of a bill.

FIG. 3 shows a circuit configuration of a transport mechanism and an identification device for the banknote 1. The banknote 1 includes a transport belt 24 wound around transport rollers 20 and 21, and transport rollers 22 and 23, respectively.
It is designed to be transported sandwiched between 25. The transport roller 23 is coupled to a motor 30 driven via a motor drive control unit 32, and the transport amount of the bill 1 is
It is obtained by counting the pulse signal PS from the pulse generating means 31 coupled to 22. The identification device has a control unit 40, and the control unit 40 that performs overall control and identification is a CP.
It consists of U41, ROM42 and RAM43. Then, the CPU 41 executes a function described below, such as a smoothing unit 411, an average value calculating unit 412, a grayscale value calculating unit 413, a grayscale total calculating unit 414, a normalizing unit 415, a comparing unit 416, a determining unit 417, and other arithmetic operations.・
Control means 418 is provided. Hybrid sensor SN20
The magnetic signal MS of A / D passes through an amplifier 51 and a waveform shaping circuit 52.
The optical signal HS is input to the converter 50, and is input to the A / D converter 50 via the amplifier 53 and the waveform shaping circuit 54. The detection signal CS of the color sensor SN13 is supplied to an amplifier 55 and a waveform shaping circuit.
56, the signal is input to the A / D converter 50, the detection signal PG of the path sensor SN12 is input to the A / D converter 50 via the amplifier 57 and the waveform shaping circuit 58, and the A / D converter 50 The converted digital values are input to the control unit 40. Further, the detection signals of the insertion detection sensors SN10 and SN11 and the passage detection sensor SN14 are also input to the control unit 40.

The operation of such a configuration will be described below.

First, the operation of creating the reference pattern shown in FIG. 4 will be described. The reference pattern is an optical, magnetic and color pattern for all normal banknotes (genuine banknotes) to be identified.

First, it is determined whether or not to create a reference pattern (step S1), and the type (denomination) of the bill for which the reference pattern is to be created is input on the operation unit 11 (step S2).
The paper money is detected by the insertion detection sensors SN10 and SN11 when the paper money is placed on the
Then, the motor 30 is driven via the motor drive control unit 32 and taken in (step S3). When the insertion detection sensors SN10 and SN11 detect the insertion of the bill by taking in the bill (step S4), the motor 30 is driven via the motor drive control unit 32 to take the bill inside (step S5), and the passage After the sensor SN12 detects the bill (step S6), it moves by a predetermined amount and then starts acquiring identification data by each sensor (step S7). When the identification is started, the detection signals of the passage sensor SN12, the color sensor SN13, and the hybrid sensor SN20 are converted by the A / D converter 50 and input to the control unit 40 (step S8). (Step S9), the conveyance of the banknote is temporarily stopped, and the arrangement pattern of the shading intensity is created by the function of the CPU 41 (Step S10). This arrangement pattern is created by adding N points (step S11), calculating the sum (step S12), calculating the average (step S13), calculating the density (step S14), summing the density (step S15), and normalizing (step S16). The created pattern data is stored in RAM 43
(Step S20), the banknote is taken in and conveyed, and stored in a storage unit (not shown) (step S21). Then, the next bill is further inserted to a predetermined position (step S2).
2). Steps S11 to S16 in the arrangement pattern creation step S10 will be described later. Then, a reference pattern is created by averaging the arrangement patterns of the sensors created as described above (step S23), and each reference pattern is stored in the reference pattern area of the denomination in the RAM 43 (step S24). . Thereafter, the same registration operation as described above is repeated for banknotes of other denominations (step S2).
Five). As a result, the reference pattern for each denomination is the seventh.
The data is obtained as shown in FIG.

Next, the operation of identifying bills will be described with reference to the flowchart of FIG.

First, when the banknote 1 is placed on the mounting table 10 and inserted into the apparatus, the motor 30 is driven via the motor drive control unit 32 by the detection of the insertion detection sensors SN10 and SN11 (step S30). (Step S31), and is taken in until the passage sensor SN12 detects the bill 1 (Step S32). After the passage sensor SN12 detects the bill 1, the identification is started after the bill 1 is conveyed by a predetermined amount, and the read data is stored in the RAM 43.
(Step S33), and when the data reading is completed, the transport of the bill 1 is temporarily stopped (steps S34, S3).
Five). Then, based on the data stored in the RAM 43, simple identification processing such as bill length and perforation is performed (step
S36), it is determined whether the bill is a normal bill (step S3)
7). If it is determined that the bill is abnormal, the motor 30 is reversed via the motor drive control unit 32 to return the bill 1 (step S51). If it is determined in step S37 that the banknote is a normal banknote, an identification process (step S40) described below is performed, and it is determined whether the banknote is a normal banknote according to the result (step S50). Then, in the case of an abnormal bill, the motor 30 is reversed in the same manner as described above to return the bill (step S5).
1) In the case of a normal bill, the motor 30 is rotated forward to take in the bill (step S52), and a predetermined process (for example, a deposit process)
Is to be performed.

Here, the identification processing in step S40 is the same as the above-described arrangement pattern creation step S10 in FIG. 4, and the operation is described in the flowchart of FIG. 6 and the waveform diagrams of FIGS. 7 (A) to (F). This will be described in detail with reference to FIG.

Data from each sensor is as shown in Figure No. 7 (A), the total data x _1, x ₂ ..., When x _n, N (e.g.
10) Add points To perform a smoothing process by adding N points (step S41). Then, the sum of the smoothed values X _i is calculated using M as the number of samples. (Step S42), and the average calculation (Step S43) is performed according to the following equation (3) to obtain an offset OS as shown in FIG. 7 (B). That is, the offset (= OF) is obtained by the following formula: SX / M (3), and then the amount of shading from the offset OS is calculated as shown in FIG. 7C (step S4).
4), excluding offset OF offset. That is, B _i = x _i − (4) is calculated to remove the deviation of the offset OF, and thereafter, the total of shading A such as a black portion in FIG. Ask for. Then, normalization is performed according to the following equation (6) to remove the variation in the gain (step S46), and FIG.
Is obtained.

Y _i = a · B _i / A (6) where a is a constant. A reference pattern as shown in FIG. 7F is previously stored in the RAM 43 in accordance with the flowchart of FIG. The matching (distance calculation) between the pattern and the reference pattern is calculated according to the following equation (7) (step S4)
7). Such pattern matching is performed for all the reference patterns for one light and shade pattern.

After the above-mentioned pattern matching, the denomination of the minimum distance is obtained, and then the authenticity is determined (step S49), and the end or reject processing is performed according to the authenticity determination result. Here, the denomination is determined by using the distance value _{Dk of} Expression (7), and the authenticity is determined by the sum value SX of Expression (2), the total value A of light and shade of Expression (5), and the distance value of Expression (7). Use _Dk .

In the above embodiment, the creation of the reference pattern is performed by the banknote recognition device itself. However, the creation of the reference pattern is performed by another device, and the reference pattern data may be separately incorporated in the banknote recognition device. Good. Further, in the above embodiment, the arithmetic processing of the identification processing is performed by software in the control unit, but may be performed by hardware using a logic circuit.

Effect of the Invention As described above, according to the identification device of the present invention, a reference pattern can be automatically created by inserting a genuine paper sheet, and the arithmetic processing for identification can be performed for banknotes of each country or each denomination, It can be used commonly for paper sheets, does not require adjustment or maintenance, does not require automatic offset adjustment, and applies the same identification method to all hybrid sensors, passage sensors, and color sensors. The detection system may be a non-imaging system in particular because data processing eliminates offset deviation and eliminates gain variations.

[Brief description of the drawings]

FIG. 1 is an external view of an identification device of the present invention, FIG. 2 (A) is a plan view showing an arrangement example of each sensor, FIG. 1 (B) is a side view thereof, and FIG. 3 is a block configuration showing an internal configuration. FIG. 4, FIG. 4 is a flowchart showing an example of creating a reference pattern, FIG. 5 is a flowchart showing an identification operation, FIG. 6 is a flowchart showing an identification process, and FIGS. FIGS. 8 and 9 (A) and 9 (B) are diagrams for explaining conventional identification. 1 ... banknote, 10 ... mounting table, 20-23 ... transport roller, 30
…… Motor, 40… Control unit, 41… CPU, 42… ROM, 43…
…RAM.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Taku Inoue 1-3-1, Shimoteno, Himeji-shi, Hyogo Glorry Industry Co., Ltd. (56) References JP-A-63-3396 (JP, A) JP-A-63-3396 JP-A-61-77987 (JP, A) JP-A-54-154400 (JP, A) JP-A-63-46588 (JP, A) JP-A-63-208710 (JP, A) (58) Fields investigated (Int) .Cl. ⁶ , DB name) G07D 7/00

Claims (2)

(57) [Claims] 1. A sheet identification apparatus configured to identify a sheet by conveying the sheet on a conveyance path in response to a drive pulse. A sensor, a storage unit that stores a value related to an output signal of the detection sensor as detection data corresponding to the drive pulse, an average value calculation unit that calculates an average value of data stored in the storage unit, A gray value calculator that calculates the difference between the average value and the data calculated by the value calculator as a gray value, and a sum value of the respective gray values calculated by the gray value calculator is obtained. Normalizing means for dividing the gray value to obtain a gray intensity arrangement pattern of the portion detected by the detection sensor; and comparing means for comparing the gray intensity arrangement pattern with a predetermined reference pattern , The paper sheet recognition apparatus characterized by based on the compared result of the comparison by the comparison means equipped with a discriminating means for discriminating the paper sheet. 2. The sensor according to claim 1, wherein the sensor comprises a non-imaging combined optical / magnetic sensor, a passage sensor, and a color sensor, and the storage unit has separate storage areas for storing data relating to output signals of the respective detection sensors. The paper sheet identification device according to claim 1, wherein: