JP2008123185A - Sign authentication system and sign authentication method - Google Patents

Abstract

A signature authentication system capable of adapting to changes with time of a signature is provided.
An electronic pen includes a position information acquisition unit that acquires position information entered by the electronic pen, a time information acquisition unit that acquires time information when the position information is acquired, and the position A control unit 123 that associates information with time information and a transmission unit 133 that transmits position information with time information are provided. The server 30 receives position information with time information transmitted by the electronic pen 10. A receiving unit 32, a storage unit 313 for storing position information with the time information, and a pattern processing unit 311 for generating a reference pattern based on time information associated with the position information stored in the storage unit 313. An authentication unit that performs authentication based on the reference pattern generated by the pattern processing unit 311 for the position information corresponding to the signature to be authenticated stored in the storage unit 313 And a 12.
[Selection] Figure 2

Description

  The present invention relates to a signature authentication system, and more particularly to a signature authentication system using a digital pen and paper.

  In recent years, with the progress of information technology, the importance of personal authentication is increasing. As a method for personal authentication, there are a method based on the knowledge of the person such as a personal identification code, a method based on personal belongings such as an IC card, and a method based on the characteristics of the person called biometrics. Biometrics includes methods based on individual patterns such as fingerprints, irises, palms and finger veins, and faces, for example, and other authentication methods that characterize the person . Signs are widely used as a means of confirming the creator and responsible person of a document regardless of domestic and overseas, and various sign authentication methods have been proposed.

  The signature authentication is performed by quantifying the individual characteristic amount included in the signature and collating it with a reference value registered in advance. However, the signatures are not always the same even if they are the same person. This is because the habits and characteristics of the person who performs the signature change with the passage of time and the like, and the possibility of deviating from a fixed reference pattern registered in advance increases. For this reason, there has been a problem that the authentication accuracy of the signature is lowered due to a change with time.

  In order to deal with such changes in signatures over time, if the difference between both of the registered reference patterns and the signatures to be authenticated increases beyond a certain range, the reference pattern is changed. A method of changing by re-registering has been proposed (for example, Patent Document 1).

However, with such an authentication method, since the time information of the signature itself remains unclear for a signature at an arbitrary point in the past, authentication is performed using a reference pattern at any point in the past. It was unclear what should be done.
Further, every time the difference between the registered reference pattern and the signature to be authenticated exceeds a certain range, it is necessary to re-register the reference pattern each time.
JP 2001-338299 A

  As described above, the conventional signature authentication system has a problem that the adaptation to the change of the signature with time is insufficient.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a sign authentication system that can flexibly adapt to changes with time of a sign.

  The sign authentication system according to the present invention is a sign authentication system having a sheet, an electronic pen capable of entering characters or figures on the sheet, and a server connected to the electronic pen so as to communicate with the electronic pen. A position information acquisition unit that acquires position information entered by the electronic pen, a time information acquisition unit that acquires time information when the position information entered by the electronic pen is acquired, and the position A control unit that processes the position information acquired by the information acquisition unit in association with the time information acquired by the time information acquisition unit; and a transmission unit that transmits the position information with the time information to the server. The server includes: a receiving unit that receives the position information with time information transmitted by the electronic pen; and a position information with time information received by the receiving unit. Corresponding to a storage unit for storing, a pattern processing unit for generating a reference pattern based on time information associated with the position information stored in the storage unit, and a signature stored in the storage unit for authentication The position information includes an authentication unit that performs authentication based on the reference pattern generated by the pattern processing unit.

  As a result, it is possible to identify the position information of the sign at a desired time by processing the position information of the entered sign in association with the time information. Become.

  The sign authentication system according to the present invention is a sign authentication system comprising a sheet, an electronic pen capable of entering characters or figures on the sheet, and a server connected to the electronic pen so as to be communicable. The pen includes a position information acquisition unit that acquires position information entered by the electronic pen, and a transmission unit that transmits the position information acquired by the position information acquisition unit to the server. The receiving unit that receives the position information transmitted by the electronic pen, the time information acquiring unit that acquires the time information received by the receiving unit, the position information received by the receiving unit, and the time information acquiring unit A storage unit that associates and stores the acquired time information and a pattern that generates a reference pattern based on the time information associated with the position information stored in the storage unit A processing unit, the position information corresponding to the signature stored be authenticated in the storage unit, based on the reference pattern generated by the pattern processing section, those having an authentication unit for performing authentication.

  As a result, it is possible to identify the position information of the sign at a desired time by processing the position information of the entered sign in association with the time information. Become.

  Further, the sign authentication system according to the present invention is a sign authentication system comprising a sheet and an electronic pen capable of entering characters or figures on the sheet, wherein the electronic pen is a position where the electronic pen is filled in. A position information acquisition unit that acquires information, a time information acquisition unit that acquires time information when the position information entered by the electronic pen is acquired, and the position information acquired by the position information acquisition unit. A storage unit that stores the time information acquired in association with the time information acquired by the time information acquisition unit, and a pattern processing unit that generates a reference pattern based on the time information associated with the position information stored in the storage unit And an authenticating unit that performs authentication based on the reference pattern generated by the pattern processing unit for the position information corresponding to the signature to be authenticated stored in the storage unit. It is obtain things.

  As a result, it is possible to identify the position information of the sign at a desired time by processing the position information of the entered sign in association with the time information. Become.

  In addition, the pattern processing unit of the signature authentication system according to the present invention includes the time information associated with the position information corresponding to the signature to be authenticated and the acquisition time of the position information corresponding to the signature to be authenticated. The reference pattern may be generated based on the time information associated with the position information acquired at this time.

  As a result, it is possible to perform authentication based on the position information of the sign entered at any time in the past.

  In addition, the pattern processing unit of the sign authentication system according to the present invention may include position information at a desired time among a plurality of pieces of position information acquired at a time before the acquisition time of position information corresponding to a signature to be authenticated. The reference pattern may be generated based on the selected position information.

  As a result, it is possible to perform authentication based on the position information of the sign entered at any time in the past.

  The pattern processing unit of the sign authentication system according to the present invention selects position information at a time closest to the acquisition time of position information corresponding to a signature to be authenticated, and sets a reference pattern based on the selected position information. You may make it produce | generate.

  Signs rarely change over time in a short period of time, so it is possible to improve the accuracy of sign authentication by performing authentication based on position information entered immediately before the signature to be authenticated as a reference pattern. it can.

  In addition, the pattern processing unit of the signature authentication system according to the present invention provides a reference by weighting a plurality of pieces of position information acquired at a time prior to the acquisition time of the position information corresponding to the signature to be authenticated. A pattern may be generated.

  Thereby, since the change of the sign accompanying a change with time can be reflected more flexibly in the reference pattern, the accuracy of sign authentication can be further improved.

  In the sign authentication system according to the present invention, the paper has a pattern indicating position information corresponding to a position where the electronic pen is filled in, and the position information acquisition unit of the electronic pen Based on the pattern, the position information entered by the electronic pen may be acquired.

  Further, the sign authentication method according to the present invention includes a step of acquiring position information entered with an electronic pen, and a step of acquiring time information when the position information entered with the electronic pen is acquired. A step of storing the position information in association with the time information, a step of generating a reference pattern based on the time information associated with the stored position information, and a signature to be authenticated The position information includes a step of performing authentication based on the generated reference pattern.

  As a result, it is possible to identify the position information of the sign at a desired point in time by processing the position information of the entered sign in association with the time information, so that it is possible to flexibly adapt to the change of the sign over time. Become.

  ADVANTAGE OF THE INVENTION According to this invention, the signature authentication system and the signature authentication method which can be flexibly adapted to the time-dependent change of a signature can be provided.

Embodiment 1 of the present invention.
FIG. 1 is a schematic diagram showing an overall configuration of a signature authentication system according to Embodiment 1 of the present invention. The signature authentication system uses the Anoto method developed by Anoto.

  As shown in FIG. 1, a signature authentication system according to Embodiment 1 of the present invention includes an electronic pen 10, a dedicated paper 20, and a personal computer (hereinafter referred to as a PC) 30 as a server. I have. Here, the electronic pen 10 and the PC 30 are connected so that they can communicate with each other. A portable terminal (not shown) such as a cellular phone may be further provided between the electronic pen 10 and the PC 30. In this case, the electronic pen 10 and the PC 30 are connected via a portable terminal so that they can communicate with each other. In this case, a dedicated application program may be installed in the mobile terminal. Furthermore, the signature authentication system may be configured such that processing performed by the PC 30 is performed on the electronic pen 10 side.

  FIG. 2 is a block diagram showing a schematic configuration of the signature authentication system according to Embodiment 1 of the present invention. In FIG. 2, only the main part of the configuration of the electronic pen 10 is shown.

  Based on FIG. 2, the structure of PC30 is demonstrated concretely. As shown in FIG. 2, the PC 30 as a server is connected to the electronic pen 10 so as to be communicable. The PC 30 includes an application unit 31, a wireless communication processing unit 32, and a display unit 34. The application unit 31 is activated when the wireless communication processing unit 32 receives position information with time information from the electronic pen 10 and starts predetermined processing. Note that the electronic pen 10 and the PC 30 can be connected via a portable terminal (not shown) so as to communicate with each other.

The application unit 31 includes a pattern processing unit 311, an authentication unit 312, a storage unit 313, and a control unit 314.
The pattern processing unit 311 stores the position information with time information received by the wireless communication processing unit 32 in the storage unit 313, and adds the time information associated with the position information stored in the storage unit 313 as will be described later. Based on this, the authentication unit 312 generates a reference pattern used for authentication.

  The authentication unit 312 authenticates the position information with time information to be authenticated received by the wireless communication processing unit 32 based on the reference pattern generated by the pattern processing unit 311.

  In the storage unit 313, position information with time information received by the wireless communication processing unit 32 is stored by the pattern processing unit 311. The wireless communication processing unit 32 receives position information transmitted from the wireless communication processing unit 133 of the electronic pen 10. The display unit 34 is configured by, for example, a liquid crystal display device. The display unit 34 displays pass / fail information of the signature verification result determined by the authentication unit 312.

  Based on FIG. 3, the structure of the electronic pen 10 is demonstrated concretely. As shown in FIG. 3, the electronic pen 10 includes an ink refill 111, a pressure sensor 113, an optical module 115, a camera 117, a light irradiation device 119, a battery 121, a control unit 123, a storage unit 125, an information processing module 127, a clock. 129, USB (Universal Serial Bus) 131, wireless communication processing unit 133, vibrator 135, LED (Light Emitting Diode) 137, position information acquisition unit 141, and time information acquisition unit 143. The control unit 123, the storage unit 125, the position information acquisition unit 141, and the time information acquisition unit 143 are included in the information processing module 127. The electronic pen 10 only needs to be able to enter characters or symbols on the dedicated paper 20, and the pen shape may be any shape.

  The increfill 111 stores the ink for recording the writing result by transferring the ink to the paper in the same manner as a normal writing pen. The ink refill 111 is of a pole pen type or a fountain pen type. The pressure sensor 113 is a means for detecting that the user is performing handwriting input with the electronic pen 10 or for detecting writing pressure. The pressure sensor 113 detects pressure during handwriting input. Specifically, when the pressure detected by the pressure sensor 113 reaches a certain value or more, the pressure sensor 113 detects that handwriting input by the electronic pen 10 has started. Thereafter, the camera 117 and the LED 137 of the electronic pen 10 are operated by the control of the control unit 123, and the handwritten input position information imaged by the camera 117 is stored in the storage unit 125 by the control of the control unit 123.

  The optical module 115 detects the light from the light irradiation device 119 by optical means received by the camera 117. The camera 117 is a light receiving device for receiving light emitted from the light irradiation device 119 and reflected by the dedicated paper 20. The light irradiation device 119 is a device that emits light for receiving light by the camera 117. The light here uses infrared rays. However, as long as the light is received by the camera 117 and can be detected by the optical module 115, the light is not limited to infrared rays but may be light of another wavelength.

  The battery 121 is a power supply unit for supplying power to each unit of the electronic pen 10. The battery 121 may be a primary battery such as a dry battery or a secondary battery such as a lithium ion battery. Further, power may be supplied via an interface such as a USB without mounting a battery. Here, the power of the electronic pen 10 is set to be turned on when the cap (not shown) of the electronic pen 10 is removed, and the power of the electronic pen 10 is turned off when the cap of the electronic pen 10 is attached. . However, it is not limited to such a setting.

  The control unit 123 is a control unit for controlling the electronic pen 10. The storage unit 125 is a storage unit for storing data in the electronic pen 10. When characters or symbols are entered on the dedicated paper 20 using the electronic pen 10, the storage unit 125 stores handwritten input position information, time information, writing pressure, and the like read by the electronic pen 10. The storage unit 125 has a capacity of about 1 MB, for example.

  The clock 129 is time measuring means for measuring the time during which handwritten input is performed. The USB 131 is data transmission means for transferring the position information entered by the electronic pen 10 to the connected electronic device. The wireless communication processing unit 133 is data transmission means for transmitting position information of handwritten input to another electronic device provided with wireless communication means. Specifically, the wireless communication processing unit 133 transmits, to the PC 30, position information entered by the electronic pen 10 based on a pattern 205 of a dedicated sheet 20 described later as a transmission unit.

  As the wireless communication means, a Bluetooth (registered trademark) system or the like is used, but it is not particularly limited. If one of the USB 131 and the wireless communication processing unit 133 is provided, the signature authentication system according to the present invention can operate even if the other is not provided. That is, when the electronic pen 10 includes only the USB 131, the USB 131 serves as a transmission unit, and transmits position information entered by the electronic pen 10 to the PC 30 based on a pattern 205 of a dedicated paper 20 described later. . Thus, by making the communication means compatible with the Bluetooth (registered trademark) system and the USB system, the cost can be reduced by using the existing communication means.

  The vibrator 135 is a means for transmitting information to the user by vibration. The LED 137 is a notification unit that transmits information to the user by lighting, blinking, or the like. If one of the vibrator 135 and the LED 137 is provided, information can be transmitted to the user even if the other is not provided. Alternatively, notification may be performed by sound such as a buzzer.

  The position information acquisition unit 141 acquires position information entered by the electronic pen 10 based on a dot pattern 210 of the dedicated paper 20 described later.

The time information acquisition unit 143 acquires time information when a signature is entered by the electronic pen 10. And the control part 123 memorize | stores the said time information in the matching memory | storage part 125 with respect to the positional information which the electronic pen 10 read.
FIG. 4 is an example of a format of stroke information stored in the storage unit 125. That is, the coordinate data indicating the position information of the written sign, the writing pressure data indicating the pressure of the sign, the time data indicating the time required for writing the sign, and the time data indicating the time when the sign is written Consists of. Here, the signature authentication system 1 according to the present invention can operate even if either or both of the pen pressure data and the time data are not provided. However, since the accuracy of authentication can be further improved by using an individual characteristic amount analyzed from writing pressure data and time data for authentication, it is preferable to have writing pressure data and time data. .

Next, the configuration of the dedicated paper 20 will be described with reference to FIG. The dedicated paper 20 is a paper that has been certified by Anoto.
In order for the electronic pen 10 to record handwritten input information, that is, position information entered by the electronic pen 10, it is necessary to perform handwriting input on the dedicated paper 20.

  As shown in FIG. 5, the dedicated paper 20 is formed with a dot pattern 210 that indicates position information corresponding to the position where the electronic pen 10 performs entry. The dot pattern 210 is composed of, for example, a collection of points 211 of the same size arranged slightly shifted from the intersections 213 of the lattice 212 with an interval of 0.3 mm. When the camera 117 of the electronic pen 10 images the point 211, the position information acquisition unit 141 of the electronic pen 10 acquires the position information.

  Here, as long as the point 211 can be detected by the optical module 115, it may be printed in a color that cannot be identified by human eyes. For example, when the camera 117 is an infrared camera, the point 208 can be detected by the optical module 115 because the entire dedicated paper 20 reflects infrared rays and the point 211 is printed with ink that absorbs infrared rays.

  In addition, the point 211 is printed at a position slightly deviated from the intersection point 213 of the grid 212 in any of the upper, lower, left, and right directions. Can do. For example, 36 (6 × 6) intersections 123 and points 211 located on the top, bottom, left, and right have 72 bits (6 × 6 × 2) of information. The dedicated paper 20 is recorded as position information by changing the combination of vertical and horizontal deviations of the points 211 for each of the 36 intersection points 213.

  While the user is writing characters or symbols on the dedicated paper 20 with the electronic pen 10, the camera 117 of the electronic pen 10 captures the dedicated paper 20 from 50 to 100 times per second. The optical module 115 detects the arrangement of the points 211. Then, the position information acquisition unit 141 of the electronic pen 10 acquires the position information of the dedicated paper 20 from the arrangement of the points 211 detected by the optical module 115. In this way, the electronic pen 10 can acquire the position on the dedicated paper 20 when the user performs handwriting input, and can store it in the storage unit 125.

  In the dedicated paper 20, a specific area corresponding to each individual who performs signature authentication or each electronic pen 10 may be set in advance as a range in which the user enters a signature with the electronic pen 10. For example, as shown in FIG. 6, a designation area 220 for entering a signature may be set for each ID that uniquely identifies an individual. At this time, the storage unit 313 of the PC 30 stores in advance correspondence information in which the position information of the designated area 220 and personal information are associated with each other. That is, information regarding each designated area 220 associated with personal information is stored in the storage unit 313 of the PC 30. Then, the control unit 314 of the PC 30 compares the position information with time information entered by the electronic pen 10 and the corresponding information to analyze the person to whom the entered sign corresponds, and Is identified. When a signature is entered outside the signature designation area 220, processing may be performed so as to invalidate the entry of the signature.

  Thereby, when sign authentication processing is performed by a plurality of individuals or a plurality of electronic pens 10, it is possible to easily identify the corresponding individuals or electronic pens 10 on the application side.

  On the other hand, if a specific area is not set in advance as a range for entering a signature, the coordinate data of the entered signature is automatically converted to desired coordinate data on the PC 30 side. Also good. For example, as shown in FIG. 7A, the user enters a signature with the electronic pen 10 at an arbitrary position on the dedicated paper 20. Then, signature coordinate data acquired by the electronic pen 10 is automatically converted into corresponding coordinates on the PC 30 side. FIG. 7B is an example of the coordinate data of the signature stored in the storage unit 313 after the coordinate conversion by the PC 30.

  As a result, it is possible to handle a sign written in an arbitrary position on the dedicated paper 20 in the same manner as a sign made in a desired area, and the user can sign without being aware of the range in which the sign is written. You can fill in.

  Next, the flow of processing of the signature authentication system in the first embodiment will be described using the sequence diagram shown in FIG. As a precondition, it is assumed that the electronic pen 10 can transmit position information with sign time information to the PC 30.

  The position information acquisition unit 141 acquires the position information of the signature entered with the electronic pen 10. The time information acquisition unit 143 of the electronic pen 10 associates the time information with the acquired position information, and stores it in the storage unit 125 as position information with time information. In general, when starting to use the electronic pen 10, it is preferable that the user fills in a signature as a reference for authentication with the electronic pen 10 a plurality of times in advance. In this way, the electronic pen 10 acquires position information with time information of the written signature in time series (S101).

  When the user's sign entry is completed, the control unit 123 of the electronic pen 10 transmits the position information with the time information of the sign stored in the storage unit 125 to the PC 30 by the wireless communication processing unit 133 (S102). Alternatively, the position information with the time information of the sign may be transmitted to the PC 30 by the wireless communication processing unit 133 every time the coordinate position of the entered sign is recognized.

  When the wireless communication processing unit 32 receives the position information with the time information of the signature entered by the electronic pen 10, the pattern processing unit 311 of the PC 30 stores the received position information with the time information in the storage unit 313 (S103). ). At this time, position information with time information may be organized so that it can be easily analyzed by the PC 30, or compression processing for reducing the data amount may be performed.

  Then, the electronic pen 10 acquires position information with time information of a signature to be authenticated (S104). The control unit 123 of the electronic pen 10 transmits the position information with the time information of the signature to be authenticated stored in the storage unit 125 to the PC 30 by the wireless communication processing unit 133 (S105).

The pattern processing unit 311 acquires position information with time information of a desired sign by a method to be described later for the position information with time information of the signature stored in the storage unit 313. Then, from the position information with time information of the acquired signature, for example, feature parameters such as temporal change, speed, and stroke order of the position information of the entered signature are extracted, and the extracted feature parameter group is A reference pattern is generated (S106).
Note that the feature parameters to be extracted are not limited to these, and pen pressure, pen inclination, characteristics as a time function, and the like may be extracted as feature parameters.
Further, the pattern processing unit 311 may store the feature parameter extracted in this way in the storage unit 313 in addition to the position information with the time information of the signature.

Then, the authentication unit 312 of the PC 30 performs authentication processing by comparing and collating position information with time information of the signature to be authenticated with the reference pattern generated by the pattern processing unit 311 (S107).
Authentication by the authentication unit 312 is performed by, for example, comparing and comparing the feature parameter extracted from the position information with the time information of the signature to be authenticated and the feature parameter of the reference pattern generated by the pattern management unit 311. Is called.
Here, the comparison and collation may compare feature parameters, and is not limited thereto, and for example, the signature strokes may be compared and collated by a method such as DP matching.
The comparison result between feature parameters can be evaluated by, for example, a scale called similarity, and when the similarity is lower than a predetermined threshold, it is determined that the signature is a sign of others, and when it is larger, the user to be authenticated It is determined that the signature is the person's signature.
For example, when the degree of similarity is high, the authentication can be strictly performed by increasing the threshold value. Accordingly, it is possible to suppress the probability of erroneously determining that the signature is the user himself / herself.

  The display unit 123 displays the authentication result information determined by the authentication unit 312 of the PC 30 (S108). In this way, the authentication result of the signature to be authenticated entered with the electronic pen 10 can be known.

  A method for generating a reference pattern based on the position information with the time information of the signature stored in the storage unit 313 by the pattern processing unit 311 according to the first embodiment of the present invention is specifically described with reference to the flowchart of FIG. Explained.

First, it is assumed that the pattern processing unit 311 of the PC 30 stores the position information with the time information of past signatures entered so far in the storage unit 313 (S201). The pattern processing unit 311 selects position information at a desired time from a plurality of pieces of position information acquired at a time before the acquisition time of the position information corresponding to the signature to be authenticated and stored in the storage unit 313. Then, a reference pattern is generated based on the selected position information (S202).
For example, when it is desired to perform authentication using the reference pattern generated based on the position information of the signature entered one year before the time when the signature to be authenticated is entered, the pattern processing unit 311 extracts a feature parameter from position information having corresponding time information, and generates the feature parameter group as a reference pattern.

  As a result, it is possible to perform authentication based on the position information of the sign entered at any time in the past.

Embodiment 2 of the present invention.
Next, with reference to the flowchart of FIG. 10, the pattern processing unit 311 according to the second embodiment of the present invention generates a reference pattern based on the position information with the time information of the signature stored in the storage unit 313. Will be described in detail. The overall configuration of the signature authentication system according to the second embodiment of the present invention and the configurations of the electronic pen 10, the dedicated paper 20, and the PC 30 are the same as the configurations shown in FIGS.

First, it is assumed that the pattern processing unit 311 of the PC 30 stores in the storage unit 313 position information with time information of past signs entered so far (S301).
The pattern processing unit 311 selects position information at a time closest to the acquisition time of the position information corresponding to the signature to be authenticated from the storage unit 313, and generates a reference pattern based on the selected position information (S302). . For example, if the signature entered 30 minutes before the time when the signature to be authenticated is entered is the latest signature, the pattern processing unit 311 extracts the feature parameter from the position information having the time information. The parameter group is generated as a reference pattern.

  Signs rarely change over time in a short period of time, so it is possible to improve the accuracy of sign authentication by performing authentication based on position information entered immediately before the signature to be authenticated as a reference pattern. it can.

Embodiment 3 of the present invention.
Subsequently, by using the flowchart of FIG. 11, the pattern processing unit 311 according to the third embodiment of the present invention generates a reference pattern based on the position information with the time information of the signature stored in the storage unit 313. Will be described in detail. The overall configuration of the signature authentication system according to the second embodiment of the present invention and the configurations of the electronic pen 10, the dedicated paper 20, and the PC 30 are the same as the configurations shown in FIGS.

  First, it is assumed that the pattern processing unit 311 of the PC 30 stores the position information with the time information of past signatures entered so far in the storage unit 313 (S401). The pattern processing unit 311 extracts a plurality of pieces of position information stored in the storage unit 313 acquired at a time before the acquisition time of the position information corresponding to the signature to be authenticated (S402). For example, the pattern processing unit 311 extracts, from the storage unit 313, a plurality of pieces of position information having time information of one year, six months, and three months before the time when the signature to be authenticated is entered.

Then, the pattern processing unit 311 extracts each feature parameter for the extracted plurality of pieces of position information, performs appropriate weighting on the feature parameter, and thereby obtains a new feature parameter subjected to weighting synthesis processing. Create (S403). For example, for weighting, the newer the time information of the position information from which the feature parameter is extracted, the larger the weighting ratio, and each feature parameter extracted from the position information of the time information one year ago, six months ago, and three months ago. On the other hand, the feature parameters are weighted and synthesized based on the ratio of 5 to 3 to 2, respectively.
The weighting ratio is not limited to this.
Further, the weighting synthesis process may be performed after extracting the characteristic parameters from the position information with the time information of the sign, and is not limited to this. For example, the weighting synthesis process is performed on a plurality of position information itself, A feature parameter may be extracted from the synthesized new position information.
The pattern processing unit 311 generates the feature parameter group after the synthesis process created in this way as a reference pattern (S404).

  Thereby, since the change of the sign accompanying a change with time can be reflected more flexibly in the reference pattern, the accuracy of sign authentication can be further improved.

Other embodiments of the present invention.
In the above-described example, the example in which the reference pattern is generated based on the position information with time information stored in the storage unit 313 has been described. However, the present invention is not limited thereto, and each time a signature is written by the electronic pen 10, A feature parameter may be extracted from the position information of the sign, and a feature parameter group previously stored in the storage unit 313 may be overwritten and updated with the extracted feature parameter. In other words, the reference pattern is updated each time a signature is entered by the electronic pen 10. For example, when the user writes a signature with the electronic pen 10 every day, the pattern processing unit 311 uses the reference pattern stored in the storage unit 313 on the previous day as the positional information with the time information of the signature entered on the day. Overwrite and update based on, and reflect the changes over time in the daily signature to the reference pattern.

  Accordingly, it is possible to adapt more flexibly to changes with time of the signature, and it is not necessary to re-register the reference pattern by automatically updating the reference pattern every time the user enters the signature.

  Furthermore, the direction of the change with time of the sign may be predicted based on the position information with the time information of the past sign entered so far. That is, the temporal change of the characteristic parameter is analyzed based on the position information with the time information of the signature stored in the storage unit 313, and the reference pattern based on the analysis result is generated. For example, as a result of analyzing position information with time information of a past sign, when one side of the entered sign is gradually expanded with time, the pattern processing unit 311 adds the time information of the sign. Create a new feature parameter that predicts the extension of the one side at the time of entry of the signature to be authenticated from the feature parameter corresponding to the length of the one side extracted from the position information, and predict from the new feature parameter Generate a pattern. Then, a predicted pattern is generated as a reference pattern, and is used for comparison and collation when the authentication unit 312 performs authentication.

In comparison and collation, for example, it is desirable to set the threshold value higher as the position information with time information used by the pattern processing unit 311 is newer.
This is because the newer the position information with the time information of the sign used for prediction, the less the change of the sign over time, and the similarity between the predicted reference pattern and the signature to be authenticated is higher than necessary. This is because it becomes.
Thereby, it is possible to adapt more flexibly to changes with time of the sign.

  The above description describes the embodiment of the present invention, and the present invention is not limited to the above embodiment. Moreover, those skilled in the art can easily change, add, and convert each element of the above embodiment within the scope of the present invention.

It is a figure which shows the whole structure of the signature authentication system which concerns on embodiment of this invention. It is a block diagram shown in detail about each composition of a signature authentication system concerning an embodiment of the invention. It is a figure which shows each structure of the electronic pen which concerns on embodiment of this invention. It is a figure which shows the format of the stroke information which concerns on embodiment of this invention. It is a figure which shows the paper which concerns on embodiment of this invention. It is a figure which shows the signature designation | designated area | region on the paper which concerns on embodiment of this invention. It is a figure which shows the mode of the coordinate transformation of the signature entry coordinate which concerns on embodiment of this invention. It is a sequence diagram which shows the process of the signature authentication which concerns on embodiment of this invention. It is a flowchart which shows the production | generation process of the reference | standard pattern which concerns on Embodiment 1 of this invention. It is a flowchart which shows the production | generation process of the reference | standard pattern which concerns on Embodiment 2 of this invention. It is a flowchart which shows the production | generation process of the reference | standard pattern which concerns on Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electronic pen 111 Increfill 113 Pressure sensor 115 Optical module 117 Camera 119 Light irradiation apparatus 121 Battery 123 Control part 125 Memory | storage part 127 Information processing module 129 Clock 131 USB
133 Wireless communication processing unit 135 Vibrator 137 LED
141 Position Information Acquisition Unit 143 Time Information Acquisition Unit 20 Dedicated Paper 210 Todd Pattern 211 Points 212 Grid 220 Sign Designation Area 30 PC
31 Application Unit 311 Pattern Processing Unit 312 Authentication Unit 313 Storage Unit 314 Control Unit 32 Wireless Communication Processing Unit 34 Display Unit

Claims (9)

A sign authentication system comprising a sheet, an electronic pen capable of entering characters or figures on the sheet, and a server connected to be able to communicate with the electronic pen,
The electronic pen is
A position information acquisition unit that acquires position information entered by the electronic pen;
A time information acquisition unit for acquiring time information when the position information entered by the electronic pen is acquired;
A control unit that processes the position information acquired by the position information acquisition unit in association with the time information acquired by the time information acquisition unit;
A transmission unit that transmits the position information with the time information to the server,
The server
A receiving unit for receiving the position information with the time information transmitted by the electronic pen;
A storage unit for storing position information with time information received by the receiving unit;
A pattern processing unit that generates a reference pattern based on time information associated with the position information stored in the storage unit;
A sign authentication system including an authentication unit that authenticates position information corresponding to a signature to be authenticated stored in the storage unit based on a reference pattern generated by the pattern processing unit. A sign authentication system comprising a sheet, an electronic pen capable of entering characters or figures on the sheet, and a server connected to be able to communicate with the electronic pen,
The electronic pen is
A position information acquisition unit that acquires position information entered by the electronic pen;
A transmission unit that transmits the position information acquired by the position information acquisition unit to the server;
The server
A receiving unit for receiving position information transmitted by the electronic pen;
A time information acquisition unit for acquiring the time information received by the reception unit;
A storage unit that stores the positional information received by the reception unit and the time information acquired by the time information acquisition unit in association with each other;
A pattern processing unit that generates a reference pattern based on time information associated with the position information stored in the storage unit;
A sign authentication system including an authentication unit that authenticates position information corresponding to a signature to be authenticated stored in the storage unit based on a reference pattern generated by the pattern processing unit. A signature authentication system comprising a sheet and an electronic pen capable of entering characters or figures on the sheet,
The electronic pen is
A position information acquisition unit that acquires position information entered by the electronic pen;
A time information acquisition unit for acquiring time information when the position information entered by the electronic pen is acquired;
A storage unit that stores the position information acquired by the position information acquisition unit in association with the time information acquired by the time information acquisition unit;
A pattern processing unit that generates a reference pattern based on time information associated with the position information stored in the storage unit;
A sign authentication system including an authentication unit that authenticates position information corresponding to a signature to be authenticated stored in the storage unit based on a reference pattern generated by the pattern processing unit. The pattern processing unit
Time information associated with the position information corresponding to the signature to be authenticated and time information associated with the position information acquired at a time before the acquisition time of the position information corresponding to the signature to be authenticated The signature authentication system according to claim 1, wherein a reference pattern is generated based on the signature. The pattern processing unit
The position information at a desired time point is selected from a plurality of position information acquired at a time earlier than the acquisition time of the position information corresponding to the signature to be authenticated, and the reference pattern is set based on the selected position information. The signature authentication system according to claim 4, wherein the signature authentication system is generated. The pattern processing unit
6. The signature authentication system according to claim 5, wherein position information at a time closest to an acquisition time of position information corresponding to a signature to be authenticated is selected, and a reference pattern is generated based on the selected position information. . The pattern processing unit
5. The sign according to claim 4, wherein the reference pattern is generated by weighting a plurality of pieces of position information acquired at a time prior to the acquisition time of the position information corresponding to the sign to be authenticated. Authentication system. The paper has a pattern indicating position information corresponding to a position where the electronic pen is used for writing,
The sign authentication according to any one of claims 1 to 7, wherein the position information acquisition unit of the electronic pen acquires position information entered by the electronic pen based on the pattern of the paper. system. Obtaining location information filled in with an electronic pen;
Obtaining time information when the position information entered by the electronic pen is obtained;
Storing the position information in association with the time information;
Generating a reference pattern based on time information associated with the stored position information;
A signature authentication method comprising a step of authenticating position information corresponding to a signature to be authenticated based on a generated reference pattern.

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