JP2000172899A - Data correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data correcting device which can accurately correct the data detaching positions of plural sensors even when paper sheets slips during transportation by synchronizing the outputs of sensors with the actual paper sheets detecting positions of the sensors and can discriminate the paper sheets with high accuracy without requiring long time for data processing. SOLUTION: A data correcting device corrects the data measurement starting positions of sensors 2 and 3 arranged in parallel in the direction perpendicular to the transporting direction of paper sheets 10 on the basis of the front end detecting timing of one sensor 2 or 3 for the paper sheets 10 based on the front end detection of the sensors 2 and 3. Thus, the detection starting positions of the sensors 2 and 3 can be corrected and, even when a skew error occurs due to the slippage of the paper sheets 10 during transportation, accurate pattern matching can be made between the outputs of the sensors 2 and 3 by removing the skew error.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applicable to a paper sheet discriminating apparatus for discriminating the authenticity, type, etc. of a paper sheet based on data obtained by detecting the characteristics of the conveyed paper sheet by a sensor. The present invention relates to a data correction device.

[0002]

2. Description of the Related Art Conventionally, when discriminating the authenticity, type, and the like of a conveyed sheet, generally, a linear scan output by a point-type sensor such as a magnetic sensor or an optical sensor is compared with a master pattern stored and held in advance. Discrimination is performed by matching. At that time, in order to perform more accurate matching, it is assumed that the sensor waveform output is synchronized with the measurement position of the paper sheet. Usually, in order to realize this, as shown in FIG. 1, an entrance sensor 13 for monitoring the insertion of the paper sheet 10 by the transport device 12, a sensor 14 for detecting the characteristic of the paper sheet 10, an encoder 15, and the like. The drive information output sensor is constructed and the output of each sensor and the measurement position are synchronized based on the position information and the drive information of the entrance sensor 13 and each sensor. Note that the distance between the entrance sensor 13 and the characteristic detection sensor 13 is d.

[0003] In the above configuration, there is a risk that slip or skew may occur at the time of conveyance due to changes in the state or environment of paper sheets or aging of the conveyance device, and the synchronization between the sensor output and the measurement position may be lost. Therefore, the above problem has been solved by improving the driving device to suppress skew and slip.

[0004]

However, in the paper sheet discriminating apparatus using the above method, since it is necessary to suppress the occurrence of minute slips, the structure of the conveyance path is complicated and the paper sheet is conveyed. It is necessary to use special materials for the parts. As a result, the transport path becomes expensive and poor in versatility, and the operation when the paper sheet is different from the originally assumed paper sheet is not guaranteed, and the necessity of maintenance or the like arises. In addition, there is known an apparatus that performs skew correction of feeding of a conveyed paper sheet by using an image sensor that reads an image of a paper sheet and an encoder that takes image data sample timing (for example, ,
See JP-A-5-166029). In this configuration, there are problems that it takes time for data processing and that the apparatus becomes expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a simple structure that enables a plurality of sensor outputs and an actual sensor detection position of a paper sheet to be detected even if the paper sheet is slipped. By synchronizing, the position of the sensor detection data can be corrected accurately, without taking time for data processing,
It is an object of the present invention to provide a data correction device that enables more accurate identification.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a type of a paper sheet is identified based on data obtained by detecting a characteristic of a paper sheet being conveyed by a sensor. In the data correction device used for the, a plurality of sensors arranged side by side in a direction perpendicular to the sheet transport direction, storage means for storing the output of the plurality of sensors for each sensor,
A data access control unit that corrects a data measurement start position based on a timing at which each sensor detects the leading end of a sheet when starting measurement based on the data stored in the storage unit. It is a thing.

In the above arrangement, based on the detection of the leading edge of a sheet by a plurality of sensors, the data measurement start position is corrected with reference to one of the timings. As a result, the detection start position of each sensor is corrected, and even if a plurality of sensor outputs have caused a skew error due to slippage in the conveyance of paper sheets, it can be removed. For this reason, the occurrence of some slippage is allowed, and it is not necessary to use a special structure or material for the transporting device, so that an inexpensive and accurate paper sheet identification device can be constructed.

According to a second aspect of the present invention, there is provided a data correction apparatus for identifying a type of a paper sheet based on data obtained by detecting characteristics of the paper sheet being conveyed by a sensor. A plurality of sensors arranged side by side in a direction perpendicular to the class transport direction, storage means for storing the outputs of the plurality of sensors for each sensor, and when starting measurement based on data stored in the storage means, Data access control means for aligning the data back and aligning the data measurement end position based on the timing at which each sensor detects the trailing edge of the paper sheet. In this configuration, the data measurement end position can be corrected based on the detection of the trailing edge of the sheet, and the same effect as above can be obtained by selectively using the leading edge detection according to the sensor characteristics and the like.

According to a third aspect of the present invention, there is provided a data correction apparatus for identifying a type of a sheet based on data obtained by detecting a characteristic of the sheet being conveyed by a sensor. A plurality of sensors arranged side by side in a direction perpendicular to the class transport direction; storage means for storing the outputs of the plurality of sensors for each sensor; and data of characteristic points serving as reference sheets and position information thereof. The reference information storage means, and when an output which is considered to correspond to the feature point is detected from the sensor, based on the position information of the feature point stored in the reference information storage means corresponding thereto, the sensor And control means for storing the output in the storage means. In this configuration, the detection position of the sensor can be corrected based on the detection of the characteristic point of the sheet. Thus, by adding the feature points as appropriate, the number of positions for correcting the displacement increases, and the accuracy of the correction increases.

According to a fourth aspect of the present invention, there is provided a data correction apparatus for identifying a type of a sheet based on data obtained by detecting a characteristic of the sheet being conveyed by a sensor. A plurality of sensors arranged side by side in a direction perpendicular to the class transport direction, storage means for storing the outputs of the plurality of sensors for each sensor, and at least the start or end timing of the one sensor output, the other sensor outputs Data control means for correcting or associating the stored addresses of the storage means in accordance with the arrangement positions of the sensors. In this configuration, at the start or end timing of the sensor output, the address of the storage unit in which the sensor output is stored is corrected or associated in accordance with the arrangement position of each sensor. It becomes possible, and an operation equivalent to the above can be obtained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A data correction device according to a first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 2A, this data correction device corrects data obtained by detecting the characteristics of a conveyed sheet by a sensor, and identifies the type of the sheet based on the data. Applies to devices that do The data correction device includes an entrance sensor 3 that detects the conveyance of paper sheets, a plurality of sensors 1 and 2 that are arranged downstream of the entrance sensor 3 in the transport direction and are arranged in a direction perpendicular to the transport direction. , 2 and a storage means 50 for storing the sensor output for each sensor. The control unit 40 controls the storage of the detection data in the storage unit 50, and when starting measurement for discrimination based on the stored data, each sensor detects the leading end of the paper sheet. The data measurement start position is corrected based on the timing (data access control means in claims).

More specifically, the control means 40 detects the leading end position of the conveyed paper sheet from the data collected by the sensors 1 and 2, and adjusts the leading end position of the conveyed sheet based on at least one timing. Data access is performed as described above, and the measurement start position is corrected. By this data access, paper sheets may be discriminated by performing pattern matching with known data for discriminating authenticity. Note that the sensor used here is a point-type sensor in which there is an output fluctuation between when a sheet is being measured and when it is not. The transport means for transporting the paper sheet 10 is not shown.

FIG. 2B shows an output example of the above-described apparatus when a sheet is conveyed. In this example, it is assumed that a slip (skew) occurs after the entrance sensor 3 detects the insertion of the paper sheet 10. In this case, a synchronous position error depending on the slip state of the paper sheet 10 occurs in each sensor output. Therefore, instead of defining the measurement start time of each sensor based on the positional relationship between the entrance sensor and each sensor and the movement amount of the conveyance path as in the related art, the fluctuation point of the output of the sensors 1 and 2 (rise, fall, etc.) The measurement start position correction specified in (2) is performed (lower view in FIG. 2B). This is performed by the operation of the control means 40. In this example, the slip error not including the skew is excluded from consideration and the skew error is corrected, and the signal from the entrance sensor 3 is not necessarily required.

FIG. 6 shows a processing procedure of the control means 40 in this embodiment. In this process, after the position information is initialized (# 1), the timing at which detection data collection by the sensors 1 and 2 is started is individually checked by detecting rising of the signal (# 2, # 3 and # 12, # 13). When data collection is started, data is stored in the storage means 50 while sequentially incrementing the address of the storage means 50 to be stored (# 4 to # 7, # 14 to # 17). After the data collection is completed, authenticity discrimination of the paper sheet is performed by pattern matching with the known data for authenticity discrimination by data access (# 8), and the result is output (# 8).
9). In the data access, the leading edge position of the paper sheet 10 is adjusted based on at least one timing of the leading edge position detection.

By performing such processing, data correction of the measurement start position is performed. By this data correction, the influence of the skew error generated during the conveyance of the paper sheet is removed, and the more accurate sensor output and the correction are performed. The relationship with the measurement point can be obtained. For this reason, it is possible to suppress a change in the sensor output pattern due to the synchronization position shift, and as a result, it is possible to discriminate the authenticity, type, and the like of the paper sheet by more accurate pattern matching.

In the configuration of the above-described embodiment, in the case where the downsizing of the paper sheet identification apparatus and the high-speed processing are required, the sensor output at the time of insertion of the paper sheet is determined by the sensor arrangement, the sensor characteristics, or the control method. May lack stability. In such a case, if the measurement start position is corrected for the output of each of the sensors described above, the reliability may be reduced. Therefore, in the second embodiment, as such a countermeasure,
As shown in FIG. 3, the sensors 1 and
The measurement end position correction for correcting the position based on the output variation point of No. 2 is performed. This enables accurate pattern matching discrimination.

FIG. 7 shows a processing procedure for performing the correction shown in FIG.
In this example, in each of the sensors 1 and 2, after address holding (ADR1, ADR2) based on the data collection result (# 26, # 36), authenticity discrimination of the paper sheet is performed (# 2).
7), and output the result (# 28). The data access in the authenticity discrimination processing is performed on the data that is returned and aligned with the rear end of the data as a reference.

In the data correction apparatus according to the above two embodiments, the position is corrected only at the point where the sheet is put into or discharged from each sensor, so that the sheet is measured from the measurement start point for each sensor. Correction for slip (especially skew error) occurring before reaching the end point is not always sufficient. This is because the effect of the slip increases as the section in which the pattern matching is performed is farther from each reference point on which the slip correction is performed. Therefore, when the matching is performed in the first half of the sensor output, the measurement start position is corrected, and when the matching is performed in the second half, the measurement end position is corrected. This makes it possible to identify the paper sheet with higher accuracy (third embodiment).

In the above three embodiments, more accurate discrimination is realized by using only general-purpose information that the sensor detects the presence or absence of a sheet. this is,
Since the correction is performed at the two ends of the paper sheet, it is effective when the paper sheet being transported is short, but the longer the paper sheet, the greater the influence of the synchronization position shift due to slippage there's a possibility that. Therefore, a countermeasure effective in such a case is shown in FIG. 4 as a fourth embodiment. In this example, a point (waveform) that can be estimated as a characteristic point of a sheet specified in advance (stored in a reference information storage means (a characteristic map described later) in claims) is detected from the sensor output, and the detection is performed. When the position is deviated from the original position (left in FIG. 4), the data is corrected to create a master pattern for measuring position estimation (right in FIG. 4), which is stored and retained for original discrimination. Discrimination is performed by matching with the master pattern of each point sensor. Here, an accurate discrimination device can be constructed by increasing the number of synchronous position deviation correction points (correction points 1 and 2 in this example).

FIG. 8 shows the procedure of the correction process. In the data collection process, when a feature point is assumed (YES in # 43), the address is corrected based on the feature map (# 46) including the feature point data and position information (# 46), and the data is stored. It is stored in the means (# 47). In this example, the detection data itself is corrected based on the data of the feature points serving as a reference at the time of data collection and the position information thereof, and stored in the storage means.

The discriminating apparatus described above realizes more accurate discrimination by correcting each synchronous position shift from each sensor output. Are used. In this case, since the arrangement of each sensor is known, the correction of the synchronous position shift, which has been performed independently for each sensor, is extended to all the sensors, thereby increasing the number of synchronous position shift correction points and realizing accurate correction. This is extremely effective when there are few feature points where position estimation pattern matching is possible for a specific sensor.In addition, since each matching result can be comprehensively judged, the reliability of the entire position correction is improved. It is possible to do.

FIG. 5A shows a fifth embodiment. In this example, a sensor 1 and multi-wavelength sensors 2, 3, and 4 that are arranged side by side in a direction perpendicular to the transport direction downstream of the transport direction and emit light of different wavelengths are provided. FIG. 5B shows the sensor output in this case. Here, the synchronous position shift of the related sensor is corrected at the timing of input / output of the sheet by the sensors arranged at different positions in the transport direction from the multi-wavelength sensor. The memory arrangement in this case is shown in FIG. 9, and the control means sets the address of the storage means (memory) in which another sensor output is stored at the start or end timing of one sensor output corresponding to the arrangement position of each sensor. Make corrections or associations. By this processing, it becomes possible to correct the synchronous position shift of each sensor,
It is also possible to easily and universally increase the number of correction points, enabling highly accurate discrimination.

According to each of the above embodiments, the injection timing at the sensor measurement point is estimated from the sensor outputs (rise, fall, etc.), and the plurality of sensor outputs are synchronized with the actual sensor detection positions of the paper sheet. In addition, the position of the sensor detection data can be accurately corrected. In other words, transport synchronization errors due to slippage and skew that occur when transporting paper sheets are corrected, enabling accurate discrimination, and a relatively simple configuration enables high-precision discrimination without time-consuming data processing. Becomes

The present invention is not limited to the configuration of the above-described embodiment, but can be variously modified, and a plurality of characteristics / measurement points of the conveyed paper sheet are detected. The sensor measurement position may be measured from the waveform of the sensor output, and the transport synchronization error in all the sensors may be comprehensively corrected from each measurement point and the sensor arrangement information.

[0025]

As described above, according to the data correction apparatus of the present invention, the output of a plurality of sensors and the actual sensor detection position of a sheet are synchronized, so that the sheet is conveyed by slippage. Even if a skew occurs, the position of the sensor detection data can be accurately corrected, and the position can be corrected with a simple configuration without taking time for data processing.

Further, even if the data is returned and aligned based on the detection of the trailing end of the conveyed paper sheets, the same effect as above can be obtained by selectively using the data according to the sensor characteristics and the like. can get. Further, by performing the detection position correction of the sensor based on the detection of the characteristic point of the paper sheet, the same effect as described above can be obtained. Furthermore, by correcting or associating the address of the storage means with the position of each sensor at the start or end timing of the sensor output, the transport synchronization error of the paper sheet is corrected, and the same effect as above can be obtained. Can be

[Brief description of the drawings]

FIG. 1A is a configuration diagram of a conventional paper sheet identification sensor device, and FIG. 1B is a diagram illustrating a sensor output waveform.

FIG. 2A is a configuration diagram of a data correction device used in a paper sheet identification device according to a second embodiment of the present invention;
(B) is a diagram showing a sensor detection output waveform and a position correction procedure.

FIG. 3 is a diagram illustrating a sensor detection output waveform and a position correction procedure according to a second embodiment.

FIG. 4 is a diagram illustrating a sensor detection output waveform and a position correction procedure according to a third embodiment.

FIG. 5A is a configuration diagram of a sensor arrangement according to a fourth embodiment, and FIG. 5B is a diagram illustrating a detection output waveform and a position correction procedure.

FIG. 6 is a flowchart illustrating a processing procedure of a control unit according to the first embodiment.

FIG. 7 is a flowchart illustrating a processing procedure of a control unit according to the second embodiment.

FIG. 8 is a flowchart illustrating a processing procedure of a control unit according to the third embodiment.

FIG. 9 is a diagram illustrating a point of associating a memory arrangement with a storage address according to a fourth embodiment;

[Explanation of symbols]

 1, 2, 3, 4 sensors 10 paper sheets 40 control means 50 storage means

Claims (4)

[Claims] 1. A data correction device used for identifying a type of a paper sheet based on data obtained by detecting a characteristic of a paper sheet to be conveyed by a sensor, wherein a direction perpendicular to a paper sheet conveyance direction is provided. A plurality of sensors arranged side by side, storage means for storing the outputs of the plurality of sensors for each sensor, when starting measurement based on data stored in the storage means, each sensor A data correction device, comprising: data access control means for correcting a data measurement start position based on a timing at which a tip is detected. 2. A data correction device used for identifying a type of a paper sheet based on data obtained by detecting a characteristic of a paper sheet being conveyed by a sensor, wherein a direction perpendicular to the paper sheet conveyance direction is provided. A plurality of sensors arranged side by side, storage means for storing the outputs of the plurality of sensors for each sensor, when starting measurement based on data stored in the storage means, each sensor A data correction device, comprising: data access control means for aligning data by returning to the front with reference to the timing of detecting the rear end, and correcting the data measurement end position. 3. A data correction device used for identifying a type of a paper sheet based on data obtained by detecting a characteristic of a paper sheet being conveyed by a sensor, wherein a direction perpendicular to the paper sheet conveyance direction is provided. A plurality of sensors arranged side by side, storage means for storing the outputs of the plurality of sensors for each sensor, reference information storage means for storing data of feature points serving as references for paper sheets and their positional information, When an output corresponding to the feature point is detected from the sensor, the sensor output is stored in the storage unit based on the position information of the feature point stored in the reference information storage unit corresponding to the output. And a control means for causing the data to be corrected. 4. A data correction device used for identifying a type of a paper sheet based on data obtained by detecting a characteristic of a paper sheet being conveyed by a sensor, wherein a direction perpendicular to the paper sheet conveyance direction is provided. A plurality of sensors arranged side by side; storage means for storing the outputs of the plurality of sensors for each sensor; and storage means for storing at least one sensor output at the start or end timing of the one sensor output A data control unit for correcting or associating the address of the sensor with the arrangement position of each sensor.