JP6113471B2 - Paper sheet processing apparatus and paper sheet processing method - Google Patents

Description

  Embodiments described herein relate generally to a paper sheet processing apparatus and a paper sheet processing method.

  Conventionally, for example, a paper sheet processing apparatus for counting and discriminating paper sheets has been put into practical use. The paper sheet processing apparatus takes in the paper sheets input into the input unit one by one and conveys them to the paper sheet inspection apparatus. The inspection device performs various processes on the paper sheet to determine the state of the paper sheet.

  The paper sheet processing apparatus, based on the inspection result of the inspection apparatus, denomination of the paper sheet, the degree of contamination of the paper sheet (Ftainness Level), and the authenticity of the paper sheet (authentication) ) Etc. The paper sheet processing apparatus classifies and accumulates the paper sheets based on the determination result.

Japanese Patent Laid-Open No. 9-73573

  In addition, there is a paper sheet processing apparatus that automatically corrects a threshold value that is a reference for inspection according to an inspection result. Such a sheet processing apparatus includes a plurality of threshold values for each direction in which the sheet is conveyed. Further, the sheet processing apparatus automatically corrects each of these threshold values. However, there is a possibility that a plurality of threshold values greatly deviate from each other due to the correction. As a result, there is a problem that the paper sheet processing apparatus may not be able to inspect paper sheets with high accuracy.

  An object of one embodiment of the present invention is to provide a paper sheet processing apparatus and a paper sheet processing method capable of inspecting paper sheets with higher accuracy.

A paper sheet processing apparatus according to an embodiment stores at least a first threshold value corresponding to a first direction of a paper sheet and a second threshold value corresponding to a second direction of the paper sheet. An image reading unit that reads the image of the paper sheet, a threshold value stored in the memory, and a damage detection unit that detects the damage of the paper sheet based on the image of the paper sheet, A first threshold correction unit that calculates a first parameter based on the image of the paper sheet in a first direction and corrects the first threshold based on the first parameter; and a second direction A second threshold value that calculates a second parameter based on the image of the paper sheet and corrects the second threshold value with a correction amount corresponding to a difference between the first parameter and the second parameter. And a correction unit.

FIG. 1 is a diagram for explaining a paper sheet processing apparatus according to an embodiment. FIG. 2 is a diagram for explaining a paper sheet processing apparatus according to an embodiment. FIG. 3 is a diagram for explaining a paper sheet processing apparatus according to an embodiment. FIG. 4 is a diagram for explaining a paper sheet processing apparatus according to an embodiment. FIG. 5 is a diagram for explaining a paper sheet processing apparatus according to an embodiment. FIG. 6 is a diagram for explaining a paper sheet processing apparatus according to an embodiment.

Hereinafter, embodiments of a paper sheet processing apparatus and a paper sheet processing method will be described in detail with reference to the drawings.
FIG. 1 shows an example of the configuration of a paper sheet processing apparatus 100 according to an embodiment.
The paper sheet inspection system includes at least one paper sheet processing apparatus, a re-inspection apparatus, and a server. The paper sheet processing apparatus 100, the reinspection apparatus, and the server are connected to each other through a network in a state where data can be transmitted and received.

  The operator supplies the stacked paper sheets P to the input unit of the paper sheet processing apparatus 100. A batch card having unique identification information is inserted between the bundles of paper sheets P. The paper sheet processing apparatus 100 takes in a plurality of input paper sheets one by one at a high speed, and inspects the ticket type, correctness, authenticity, and the like of the imported paper sheets. Furthermore, the paper sheet processing apparatus 100 counts paper sheets. Furthermore, the paper sheet processing apparatus 100 binds and discharges reusable paper sheets.

  The paper sheet processing apparatus 100 can process a batch card inserted between a bundle of paper sheets. Unique identification information (ID) is printed on the batch card. The paper sheet processing apparatus 100 optically scans the batch card and acquires identification information.

  The paper sheet processing apparatus 100 associates the paper sheet count result, the paper sheet type, the batch card identification information, the determination result, and the like for each bundle of paper sheets. The paper sheet processing apparatus 100 transmits the associated inspection result (including the batch card ID, the paper sheet type, the number of sheets, and the determination result) to the server.

  Further, the paper sheet processing apparatus 100 discharges the batch card as an exclusion ticket. In other words, the paper sheet processing apparatus 100 discharges a bundle of the paper sheets determined to require re-examination and the batch card as an exclusion ticket.

  The server attaches an index to the inspection result transmitted from the paper sheet processing apparatus 100 and stores it in a storage medium in the server.

  Further, an operator who operates the paper sheet processing apparatus 100 and the reexamination apparatus inserts the rejection ticket discharged from the paper sheet processing apparatus 100 into the reinspection apparatus. The re-inspection device re-inspects the inserted rejection ticket. In this case, the re-inspection apparatus processes a bundle of paper sheets and batch cards in the same manner as the paper sheet processing apparatus 100. The reinspection apparatus transmits the paper sheet count result, the paper sheet type, the batch card identification information, the determination result, and the like as the reinspection result to the server.

  The server combines the reinspection result transmitted from the reinspection apparatus with the inspection result transmitted from the paper sheet processing apparatus 100, and stores the combined inspection result in a storage medium in the server. For example, the server adds the reinspection result to the inspection result including identification information that matches the identification information included in the reinspection result.

  As shown in FIG. 1, the sheet processing apparatus 100 includes an input unit 112 and an operation display unit 137 outside the apparatus. The paper sheet processing apparatus 100 includes a take-out unit 113, a suction roller 114, a conveyance path 115, an inspection unit 116, stacking units 128 to 131, a cutting unit 133, and an exclusion stacking unit 134. Further, the paper sheet processing apparatus 100 includes a main control unit 151. The main control unit 151 controls the operation of each unit of the paper sheet processing apparatus 100 in an integrated manner.

  The input unit 112 is configured to input a paper sheet P such as a banknote. The input unit 112 receives the stacked paper sheets P together. As described above, a batch card having unique identification information is inserted between the bundles of paper sheets P.

  The operation display unit 137 displays various operation guidance and processing results for the operator. The operation display unit 137 receives various operation inputs from the operator. The operation display unit 137 may be configured as a touch panel. In this case, the sheet processing apparatus 100 detects various operation inputs based on the buttons displayed on the operation display unit 137 and the operations performed on the operation display unit 137 by the operator.

  The take-out part 113 is provided in the upper part of the input part. The take-out unit 113 includes a suction roller 114. The suction roller 114 is provided so that the paper sheet P set in the input unit 112 is in contact with the end in the stacking direction. That is, the suction roller 114 rotates to take the sheets P set in the input unit 112 one by one from the end in the stacking direction. For example, the suction roller 114 functions to take out one sheet of paper P every rotation. As a result, the suction roller 114 takes out the paper sheet P at a constant pitch. The paper sheet P taken in by the suction roller 114 is introduced into the conveyance path 115. Further, the suction roller 114 may be configured to include a suction rotor that is sucked and taken out on the surface of a paper sheet by using, for example, a suction force of a vacuum pump.

  The conveyance path 115 conveys the paper sheet P to each part in the paper sheet processing apparatus 100. The conveyance path 115 includes a conveyance belt and a drive pulley (not shown). The conveyance path 115 operates the conveyance belt by a drive motor and a drive pulley (not shown). The conveyance path 115 conveys the paper sheet P taken in by the suction roller 114 at a constant speed by a conveyance belt. In the following description, the side near the take-out unit 113 in the conveyance path 115 is the upstream side, and the side near the exclusion stacking unit 134 is the downstream side.

  An inspection unit 116 is provided on the conveyance path 115 extending from the extraction unit 113. As shown in FIG. 2, the inspection unit 116 includes a ticket type detection unit 116a, a true / false detection unit 116b, a damage detection unit 116c, and an information processing unit 116d. The inspection unit 116 detects optical characteristic information, mechanical characteristics, and magnetic characteristic information of the paper sheet P. As a result, the paper sheet processing apparatus 100 detects the type, correctness, authenticity, and the like of the paper sheet P.

  The inspection unit 116 includes an image reading device that reads an image on the surface of the paper sheet P. The image reading device reads an image of the paper sheet P conveyed by the conveyance path 115. The image reading apparatus includes a camera having a light receiving element such as a charge coupled device (CCD) and an optical system that focuses light on the light receiving element. Further, the camera may be configured to include a CMOS or other light receiving element and an optical system that forms an image of light on the light receiving element.

  The ticket type detection unit 116a, authenticity detection unit 116b, damage detection unit 116c, and information processing unit 116d perform various processes based on the image of the paper sheet P acquired by the image reading device. Thereby, the ticket type detection unit 116a, the authenticity detection unit 116b, and the fitness detection unit 116c each acquire a detection result. The ticket type detection unit 116a, the authenticity detection unit 116b, and the fitness detection unit 116c supply the detection result to the information processing unit 116d. The information processing unit 116d determines the state of the paper sheet P based on the detection result.

  That is, the ticket type detection unit 116a detects the ticket type (denomination) of the paper sheet P based on the image of the paper sheet P acquired by the image reading device.

  Further, the authenticity detection unit 116b detects the authenticity of the paper sheet P based on the image of the paper sheet P acquired by the image reading device. That is, the authenticity detection unit 116b determines whether the paper sheet P is a genuine ticket or a counterfeit.

  Further, the fitness detection unit 116c detects the fitness of the paper sheet P based on the image of the paper sheet P acquired by the image reading device. That is, the damage detection unit 116c determines whether the paper sheet P is a correct sheet that can be recirculated or an unfit sheet that cannot be redistributed.

  The information processing unit 116d integrates the detection results supplied from the ticket type detection unit 116a, the authenticity detection unit 116b, and the fitness detection unit 116c. As a result, the information processing unit 116d generates a detection result in which the sheet type, authenticity, and correctness are associated with each paper sheet P. The information processing unit 116 d transmits the detection result for each paper sheet P to the main control unit 151.

  The main control unit 151 performs various determinations based on the detection result supplied from the inspection unit 116. For example, the main control unit 151 determines whether or not the paper sheet P should be excluded. The main control unit 151 determines that the paper sheet P determined to be a fake ticket, the paper sheet P for which overlap has been detected, or the paper sheet P that cannot be determined to be a rejection ticket.

  In addition, the main control unit 151 detects a short pitch in which detection by each detector is not performed correctly because the distance between the front paper sheet P and the back paper sheet P is short in the transport path. P is determined to be an exclusion ticket.

  Further, the main control unit 151 can recognize the batch card identification information based on the batch card identification information image acquired by the image reading device of the inspection unit 116.

  The paper sheet processing apparatus 100 conveys the paper sheet P determined to be a genuine note to the stacking units 128 to 131. Further, the paper sheet processing apparatus 100 conveys the paper sheet P determined to be a non-performing ticket to the cutting unit 133. The cutting unit 133 includes a cutting machine 133a and a stacker 133b. The cutting machine 133a of the cutting unit 133 cuts the conveyed slip. The cutting unit 133 accumulates the cut pieces of the paper sheet P in the stacker 133b. The stacker 133b includes a take-out port from which a piece of paper can be removed from the outside. That is, the operator can take out the paper pieces of the paper sheets P accumulated in the stacker 133b cut from the take-out port.

  The paper sheet processing apparatus 100 conveys the paper sheet P determined to be an exclusion ticket to the rejection stacking unit 134. Excluded tickets include, for example, abnormally transported tickets such as a two-sheet pick-up ticket, defective tickets that are broken or torn, and indeterminate tickets such as non-applicable ticket types or fake tickets. Further, the paper sheet processing apparatus 100 conveys the batch card inserted between the paper sheet P and the paper sheet P to the exclusion stacking unit 134 as an exclusion ticket.

  A plurality of gates (not shown) are provided on the conveyance path 115 on the downstream side of the inspection unit 116. Each of the gates is controlled by the main control unit 151. The main control unit 151 controls the operation of each gate based on the result of the inspection by the inspection unit 116. As a result, the main control unit 151 performs control so that the paper sheet P conveyed through the conveyance path 115 is conveyed to a predetermined processing unit.

  In addition, the main control unit 151 transfers each gate and transport so that a rejected ticket that is determined not to be a genuine note or an uninspectable ticket that cannot be inspected by the inspection unit 116 is accumulated in the exclusion stacking unit 134. Control the road. The exclusion stacking unit 134 is configured so that the operator can take out the stacked paper sheets P.

  In addition, the main control unit 151 controls each gate and the conveyance path so that the paper sheet P determined to be a genuine note is conveyed to the stacking units 128 to 131 (generally referred to as the stacking unit 132).

  In addition, the main control unit 151 controls each gate and the conveyance path so that the paper sheet P determined to be a non-performing paper is conveyed to the cutting unit 133.

  The operator can arbitrarily set the type (ticket type) of the paper sheet P to be processed by the paper sheet processing apparatus 100 by operating the operation display unit 137 or the like.

  Note that the main control unit 151 displays the counting result of the paper sheet P conveyed to the stacking unit 132 or the cutting unit 133, the paper sheet type, the batch card identification information, the determination result, and the like. The data is stored as an inspection result in association with each bundle of classes. The main control unit 151 transmits the reinspection result to the server.

  The paper sheet P conveyed by the paper sheet processing apparatus 100 as described above has different patterns printed on the front side and the back side. Further, the paper sheet P has a state in which one side is conveyed in the forward direction (Forward) so that one side faces the downstream side, and a state in which the paper sheet P is conveyed in the reverse direction (Rear) so that one side faces the upstream side. It is transported in either state.

  For this reason, the paper sheet P is conveyed in one of the four directions shown in FIG. FIG. 3A shows an example of a ticket (FF ticket) in which the paper sheet P is face up and conveyed in the forward direction. FIG. 3B shows an example of a ticket (FR ticket) in which the paper sheet P is face up and conveyed in the reverse direction. FIG. 3C shows an example of a ticket (BF ticket) in which the paper sheet P is face down and is conveyed in the forward direction. FIG. 3D shows an example of a ticket (BR ticket) in which the paper sheet P is faced down and conveyed in the reverse direction.

  The damage detection unit 116c of the inspection unit 116 includes a memory having a threshold value for each conveyance state of the paper sheet P. That is, the fitness detection unit 116c sets the threshold value for the FF ticket (FF threshold value), the threshold value for the FR ticket (FR threshold value), the threshold value for the BF ticket (BF threshold value), and the threshold value for the BR ticket (BR threshold value). A memory for storing;

  Furthermore, the damage detection unit 116c can automatically correct each of these threshold values. However, there is a possibility that a plurality of threshold values greatly deviate from each other due to the correction. Therefore, the damage detection unit 116c controls the amount of fluctuation of the other three threshold values based on one of the above four threshold values. Thereby, the damage detection unit 116c can detect the damage of the paper sheet P with high accuracy without remaining in the transport direction of the paper sheet P.

  For example, the damage detection unit 116c generates an FF threshold based on the FF ticket. The damage detection unit 116c generates one measurement value (hist) from the image of one FF ticket. The damage detection unit 116c creates a hist with the paper sheet P that flows from the start of counting to the stop of counting (hereinafter between batches).

  Note that a batch is established when a hist is generated from, for example, 900 or more paper sheets P. The number of batches indicates the number of feed-offs in which a bundle of paper sheets P of a predetermined number or more is taken in. Even if the damage detection unit 116c generates a hist from 800 sheets of paper P, it does not count as one batch. In this case, the damage detection unit 116c counts as one batch when a hist is further generated from 100 sheets of paper P.

  FIG. 4 shows an example of threshold value update processing. When generating a threshold value, for example, several hundred sheets P are input into the sheet processing apparatus 100. The damage detection unit 116c sequentially generates a hist based on the image acquired from the input paper sheet P (step S11). Furthermore, the damage detection unit 116c determines whether or not the generated hist has exceeded a predetermined number of batches (step S12). The damage detection unit 116c generates a threshold when the generated hist exceeds the predetermined number of batches. For example, the fitness detection unit 116c determines one threshold value when the first three batches of hist are generated. Thereafter, the damage detection unit 116c determines one threshold value every five batches.

  When the generated hist exceeds the predetermined number of batches, the damage detection unit 116c determines whether or not the paper sheet P used for generating the hist is an FF ticket (step S13). The damage detection unit 116c may be configured to determine whether or not the paper sheet P is an FF ticket based on an operation input. Further, the damage detection unit 116c may be configured to determine whether the paper sheet P is an FF ticket based on the read image.

  If it is determined in step S13 that the ticket is an FF ticket, the damage detection unit 116c generates a parameter (moving average) based on a predetermined loss rate and the plurality of generated hist (step S14). . The damage detection unit 116c generates a parameter so that the number corresponding to the loss rate among the paper sheets P used for generating the hist is detected as a slip. The damage detection unit 116c starts the search from the lower order of the histogram, and determines the percentage of paper sheets corresponding to the loss rate from the lower order as a damaged ticket. For example, if the loss rate is 15%, the damage detection unit 116c may detect 15% of the plurality of paper sheets P used for generating the histories as a slip. A parameter (first parameter) is generated.

  Furthermore, the damage detection unit 116c uses the first parameter (old first parameter) generated at the previous timing and the first parameter (new first parameter) generated in step S14. Compare. Thereby, the damage detection unit 116c determines whether or not the difference between the old first parameter and the new first parameter is less than a predetermined value. For example, the damage detection unit 116c determines whether or not the difference between the old first parameter and the new first parameter is less than 10 points (step S15). When the difference between the old first parameter and the new first parameter is 10 points or more, the fitness detection unit 116c ends the process without updating the threshold value.

  When it is determined that the difference between the old first parameter and the new first parameter is less than 10 points, the damage detection unit 116c sets the new first parameter as a new threshold value (FF threshold value) (step S1). S16). Furthermore, the fitness detection unit 116c clears the hysteresis (step S17) and ends the process. The damage detection unit 116c performs the above process again when more than a predetermined number of batches are generated. Thereby, the damage detection part 116c can correct | amend a threshold value automatically sequentially.

  Furthermore, when it is determined in step S13 that the paper sheet P used to generate the hist is not an FF ticket, the damage detection unit 116c performs the FR threshold value, the BF threshold value, and the BR value through the processing in steps S18 to S28. Each threshold is updated.

  If it is determined in step S13 that the ticket is not an FF ticket, the damage detection unit 116c determines the second loss rate based on a predetermined loss rate and a plurality of histories generated from the FR ticket, BF ticket, or BR ticket. Parameters (moving average) are generated (step S18).

  Furthermore, the damage detection unit 116c uses the second parameter (old second parameter) generated at the previous timing and the second parameter (new second parameter) generated in step S18. Compare. Thereby, the damage detection unit 116c determines whether or not the difference between the old second parameter and the new second parameter is less than a predetermined value. For example, the damage detection unit 116c determines whether or not the difference between the old second parameter and the new second parameter is less than 10 points (step S19). If the difference between the old second parameter and the new second parameter is 10 points or more, the fitness detection unit 116c ends the process without updating the threshold value.

  When it is determined that the difference between the old second parameter and the new second parameter is less than 10 points, the damage detection unit 116c determines that the first parameter generated from the FF ticket, the FR ticket, the BF ticket, Alternatively, the second parameter generated from the BR ticket is compared (step S20). Thereby, the damage detection unit 116c determines whether or not the value of the first parameter−the second parameter is less than “−10” (step S21).

  When the value of the first parameter—the second parameter is “−10” or more, the damage detection unit 116c does not change the threshold value.

  When the value of the first parameter-second parameter is less than "-10", the damage detection unit 116c determines whether the value of the first parameter-second parameter is "-3" or less. Judgment is made (step S22). When the value of the first parameter-the second parameter is larger than “−3”, the damage detection unit 116c subtracts 3 from the threshold value (step S23). That is, when the value of the first parameter−the second parameter is larger than “−3”, the damage detection unit 116c decrements the threshold value by a predetermined value.

  When the value of the first parameter—the second parameter is “−3” or less, the damage detection unit 116c determines whether the value of the first parameter—the second parameter is “3” or less. (Step S24). When the value of the first parameter-the second parameter is greater than “3”, the damage detection unit 116c subtracts a value corresponding to the difference between the first parameter and the second parameter from the threshold value ( Step S25).

  When the value of the first parameter—the second parameter is “3” or less, the damage detection unit 116c determines whether the value of the first parameter—the second parameter is “10” or less. (Step S26). When the value of the first parameter—the second parameter is greater than “10”, the damage detection unit 116c adds 3 to the threshold value (step S27). That is, when the value of the first parameter-the second parameter is larger than “10”, the damage detection unit 116c increments the threshold value by a predetermined value.

  Further, the damage detection unit 116c clears the hysteresis (step S28) and ends the process. The damage detection unit 116c performs the above process again when more than a predetermined number of batches are generated. Thereby, the damage detection part 116c can correct | amend a threshold value automatically sequentially.

  As described above, the damage detection unit 116c can correct the threshold corresponding to the other transport state so as to vary within a predetermined range on the basis of one of the four transport states. Thereby, the damage detection unit 116c can prevent a plurality of threshold values from greatly deviating from each other due to the correction. As a result, it is possible to provide a paper sheet processing apparatus and a paper sheet processing method that can inspect paper sheets with higher accuracy.

  5 and 6 show examples of fluctuation of each threshold value. Here, an example is shown in which the FF threshold is the reference, and the FR threshold follows the FF threshold. It is assumed that the initial value of the FF threshold is “700” and the initial value of the FR threshold is “710”. In this state, it is assumed that histories of a predetermined batch or more are generated.

  In this case, as shown in FIG. 5, the FR threshold value is automatically corrected to a value close to the FF threshold value “700” after being updated several times.

  Furthermore, it is assumed that the FF threshold value has become a higher value “705 to 710” (high density state) due to the influence of the contamination of the optical system of the image reading apparatus after being updated several times. Also in this case, the FR threshold value is automatically corrected to a value of “705 to 710” so as to follow the FF threshold value.

  Further, as shown in FIG. 6, it is assumed that the optical system of the image reading apparatus has been wiped off. In this case, since the image acquired from the paper sheet P becomes brighter, the FR threshold value is lowered by a predetermined value. That is, the FR threshold value is lowered from “710” to “705”. However, the FR threshold value is automatically corrected to a value close to the FF threshold value “710” after the threshold value is updated several times after cleaning.

  In the above-described embodiment, the configuration has been described in which the other threshold is followed based on the FF threshold. However, the present invention is not limited to this configuration. The paper sheet processing apparatus 100 may be configured with any threshold as a reference.

  Further, the sheet processing apparatus 100 may be configured to vary the threshold other than the reference by any value. Moreover, each value of step S21 thru | or S27 of FIG. 4 may be set arbitrarily. In other words, the threshold correction value and the condition for correcting the threshold may be set to any values.

  It should be noted that the functions described in the above embodiments are not limited to being configured using hardware, but can be realized by causing a computer to read a program describing each function using software. Each function may be configured by appropriately selecting either software or hardware.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 100 ... Paper sheet processing apparatus, 112 ... Input part, 113 ... Extraction part, 114 ... Adsorption roller, 115 ... Conveyance path, 116 ... Inspection part, 116a ... Ticket type detection part, 116b ... Authenticity detection part, 116c ... Right Loss detection unit, 116d ... information processing unit, 128 ... stacking unit, 129 ... stacking unit, 130 ... stacking unit, 131 ... stacking unit, 132 ... stacking unit, 133 ... cutting unit, 133a ... cutting machine, 133b ... stacker, 134 ... exclusion stacking unit, 137 ... operation display unit, 151 ... main control unit.

Claims (4)

A memory for storing at least a first threshold value corresponding to the first orientation of the paper sheet and a second threshold value corresponding to the second orientation of the paper sheet ;
An image reading unit for reading the image of the paper sheet;
A damage detection unit that detects the damage of the paper sheet based on the threshold value stored in the memory and the image of the paper sheet;
A first threshold value correction unit that calculates a first parameter based on the image of the paper sheet in a first direction and corrects the first threshold value based on the first parameter ;
A second parameter is calculated based on the image of the paper sheet in the second direction, and the second threshold value is corrected with a correction amount corresponding to the difference between the first parameter and the second parameter. A second threshold correction unit;
A paper sheet processing apparatus comprising: The second threshold value correcting unit corrects the second threshold value by a preset value when a difference between the first parameter and the second parameter is within a preset range. the paper sheet processing apparatus according to 1. When the difference between the first parameter and the second parameter is less than a preset value, the second threshold correction unit responds to a difference between the first parameter and the second parameter. the paper sheet processing apparatus according to claim 2 in which only the value for correcting the second threshold value. A memory for storing at least a first threshold value corresponding to the first orientation of the paper sheet and a second threshold value corresponding to the second orientation of the paper sheet; and image reading for reading an image of the paper sheet A paper sheet processing apparatus, and a paper sheet processing apparatus comprising: a paper sheet processing apparatus comprising: a health detection unit configured to detect the paper sheet paper based on the threshold value stored in the memory and the paper image. A processing method,
Calculating a first parameter based on an image of the paper sheet in a first orientation, correcting the first threshold based on the first parameter ;
Calculating a second parameter based on the image of the paper sheet in a second orientation;
A paper sheet processing method for correcting the second threshold value with a correction amount corresponding to a difference between the first parameter and the second parameter .

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