WO2018155107A1 - Dispositif et procédé de traitement d'authentification, et support d'enregistrement lisible par ordinateur - Google Patents

Dispositif et procédé de traitement d'authentification, et support d'enregistrement lisible par ordinateur Download PDF

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Publication number
WO2018155107A1
WO2018155107A1 PCT/JP2018/003046 JP2018003046W WO2018155107A1 WO 2018155107 A1 WO2018155107 A1 WO 2018155107A1 JP 2018003046 W JP2018003046 W JP 2018003046W WO 2018155107 A1 WO2018155107 A1 WO 2018155107A1
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WIPO (PCT)
Prior art keywords
signature
pressure
sensitive sheet
signal
written
Prior art date
Application number
PCT/JP2018/003046
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English (en)
Japanese (ja)
Inventor
遠藤　浩幸
二瓶　史行
規之 殿内
Original Assignee
日本電気株式会社
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Publication date
Application filed by 日本電気株式会社 filed Critical 日本電気株式会社
Priority to JP2019501171A priority Critical patent/JPWO2018155107A1/ja
Publication of WO2018155107A1 publication Critical patent/WO2018155107A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis

Definitions

  • the present invention relates to an authentication processing apparatus and an authentication processing method for digitally authenticating a user's autograph by signature, and further relates to a computer-readable recording medium on which a program for realizing these is recorded. .
  • Patent Documents 1 and 2 propose a system for realizing authentication by handwritten signature on a computer.
  • Patent Document 1 discloses an authentication processing system including a dedicated pen and an authentication processing device.
  • a dedicated pen includes a CCD camera that photographs a pen tip and a pressure sensor that specifies a writing pressure.
  • the authentication processing device acquires image data from the CCD camera and writing pressure data from the pressure sensor from this dedicated pen, and from the acquired data, the movement vector, writing speed, pen holding inclination angle, black / white The dot composition ratio and writing pressure are detected. Then, the authentication processing device performs authentication by comparing each specified data with reference data registered in advance.
  • Patent Document 2 discloses a signature pad that digitizes a signature made by a user by handwriting and executes an authentication process using the digitized signature.
  • the signature pad disclosed in Patent Document 2 includes a planar pad portion and an optical position detection device.
  • the position detection device includes a light source that emits light from one end of the pad portion toward the other end, and a light receiving element. For this reason, in the signature pad, when the user performs a signature on the pad using the pen, the light emitted from the light source is reflected by the user's pen, and the reflected light is received by the light receiving element.
  • the signature pad detects the pen tip movement trajectory, the pen tilt, and the pen movement speed based on the received light, and performs authentication using the detected information and pre-registered profile data. Execute.
  • the CCD camera is attached to the pen so that the imaging direction is the pen tip, and moves together with the pen.
  • the photographing range of the CCD camera is a narrow range around the pen tip. For this reason, it is difficult to accurately detect information such as the movement vector, the writing speed, the pen holding inclination angle, and the black / white dot composition ratio from the image data from the CCD camera.
  • the signature pad disclosed in Patent Document 2 there is only one set of light source and light receiving element, and it is difficult to accurately detect the pen tip movement trajectory, pen tilt, and pen movement speed. is there. Therefore, the signature pad disclosed in Patent Document 2 also has a problem that authentication accuracy is low.
  • An example of the object of the present invention is to provide an authentication processing apparatus, an authentication processing method, and a computer-readable recording medium capable of solving the above-described problems and improving the accuracy of authentication when authenticating a handwritten signature by digital processing. There is to do.
  • an authentication processing device provides: A signal acquisition unit that acquires a signal specifying the pressed position and the pressure applied to the position, which is output from the pressure-sensitive sheet when a written signature is made on the pressure-sensitive sheet; Based on the acquired signal, the pressed position is specified, and the movement speed of the specified pressed position and the pressure applied to the specified pressed position from the start to the end of the writing. And at least a detection unit for detecting, Using the detected moving speed and pressure, it is determined whether or not the signature written on the pressure sensitive sheet matches a pre-registered signature.
  • An authorized authentication processor It is characterized by having.
  • an authentication processing method includes: (A) obtaining a signal specifying the pressed position and the pressure applied to the position output by the pressure-sensitive sheet when a written signature is made on the pressure-sensitive sheet; and (B) Based on the acquired signal, the pressed position is specified, and the movement speed of the specified pressed position and the specified pressed position are determined from the start to the end of the writing. Detecting at least the applied pressure; and (C) Using the detected moving speed and pressure, it is determined whether or not the signature written on the pressure sensitive sheet matches a pre-registered signature. Allow authentication, steps, and It is characterized by having.
  • a computer-readable recording medium On the computer, (A) obtaining a signal specifying the pressed position and the pressure applied to the position output by the pressure-sensitive sheet when a written signature is made on the pressure-sensitive sheet; and (B) Based on the acquired signal, the pressed position is specified, and the movement speed of the specified pressed position and the specified pressed position are determined from the start to the end of the writing. Detecting at least the applied pressure; and (C) Using the detected moving speed and pressure, it is determined whether or not the signature written on the pressure sensitive sheet matches a pre-registered signature. Allow authentication, steps, and A program including an instruction for executing is recorded.
  • FIG. 1 is a block diagram showing a schematic configuration of an authentication processing apparatus according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing a configuration of a pressure-sensitive sheet used in the embodiment of the present invention.
  • FIG. 3 is a block diagram specifically showing the configuration of the authentication processing apparatus according to the embodiment of the present invention.
  • FIG. 4 is a diagram showing an example of a signature registered in the signature database in the embodiment of the present invention.
  • FIG. 5 is a flowchart showing the operation of the authentication processing apparatus in the embodiment of the present invention.
  • FIG. 6 is a block diagram illustrating an example of a computer that implements the authentication processing apparatus according to the embodiment of the present invention.
  • FIG. 1 is a block diagram showing a schematic configuration of an authentication processing apparatus according to an embodiment of the present invention.
  • the authentication processing device 10 includes a signal acquisition unit 11, a detection unit 12, and an authentication processing unit 13. Further, the authentication processing device 10 is connected to the pressure sensitive sheet 20.
  • the pressure-sensitive sheet 20 is configured to output a signal specifying the position where the pressure is received and the pressure applied by the pressure when the pressure-sensitive sheet 20 is pressed. Accordingly, when a written signature is performed on the pressure-sensitive sheet 20, the pressure-sensitive sheet 20 detects a position pressed by writing and a pressure applied to the position (hereinafter referred to as “signature specifying signal”). Output).
  • 21 is a writing instrument.
  • the signal acquisition unit 11 acquires this.
  • the detection unit 12 specifies the position pressed by the signature based on the acquired signature specifying signal, and the moving speed of the specified pressed position and the specified pressed position from the start to the end of writing. The pressure applied to the at least is detected.
  • the authentication processing unit 13 determines whether the signature written on the pressure-sensitive sheet 20 matches the signature registered in advance using the detected moving speed and pressure. As a result of the determination, if they match, the authentication processing unit 13 permits authentication.
  • FIG. 2 is a cross-sectional view showing a configuration of a pressure-sensitive sheet used in the embodiment of the present invention.
  • FIG. 3 is a block diagram specifically showing the configuration of the authentication processing apparatus according to the embodiment of the present invention.
  • the pressure-sensitive sheet 20 includes a first substrate 201 in which thin film transistors 203 are arranged in an array, a second substrate 202, and a pressure-sensitive rubber layer 212.
  • the pressure sensitive rubber layer 212 is sandwiched between the first substrate 201 and the second substrate 202.
  • the thin film transistor 203 includes a gate electrode 204 provided over the first substrate 201, a gate insulating film 207 covering the gate electrode 204, a drain electrode 205, a source electrode 206, and a semiconductor layer 208. It has.
  • the drain electrode 205 and the source electrode 206 are formed over the gate insulating film 207, and a semiconductor layer 208 is formed between the drain electrode 205 and the source electrode 206.
  • an insulating protective film 211 is provided on the first substrate 201 so as to cover the thin film transistor 203, and an array electrode 210 corresponding to each thin film transistor 203 is provided on the protective film 211. Yes.
  • the array electrode 210 is electrically connected to the source electrode 206 by a via electrode 209 that penetrates over the protective film 211.
  • the array electrode 210 is in contact with the pressure-sensitive rubber layer 212.
  • the pressure-sensitive rubber layer 212 is formed by dispersing conductive particles 212a in a base material made of a rubber material.
  • a common electrode 213 is provided on the surface of the second substrate 202 on the pressure-sensitive rubber layer 212 side. Therefore, when pressing is performed at an arbitrary location on the pressure-sensitive sheet 20, the second substrate 202 and the common electrode 213 are bent, thereby compressing the corresponding location on the pressure-sensitive rubber layer 212. As a result, the dispersed particles 212a come into contact with each other at the portion where the pressure-sensitive rubber layer 212 is pressed, and the common electrode 213 and the array electrode 210 are electrically connected via the contacting particles 212a.
  • the pressure sensitive sheet 20 since a voltage is applied to the common electrode 213 and the gate electrode 204, if the common electrode 213 and the array electrode 210 are electrically connected via the particles 212 a, a current is supplied to the drain electrode 205. Flows. The value of the current flowing through the drain electrode 205 increases as the amount of the particles 212a in contact with each other increases, that is, as the pressure applied by pressing increases.
  • the pressure-sensitive sheet 20 outputs a signal indicating the position of the drain electrode 205 through which a current flows and whose level changes in accordance with the pressure applied by the pressing.
  • this signal becomes a signature specifying signal.
  • the pressure sensitive sheet 20 applies a voltage to the gate electrode 204 at a constant timing, thereby repeatedly outputting a signature specifying signal at a set time interval.
  • the authentication processing device 10 includes a signature database 14 in which signatures are registered in advance, in addition to the signal acquisition unit 11, the detection unit 12, and the authentication processing unit 13. And an image display unit 15. Further, a display device 30 for presenting information to the manager 31 and a display device 23 for presenting information to the user 22 who performs a signature are connected to the authentication processing device 10.
  • the signal acquisition unit 11 acquires a signature specifying signal that is repeatedly output from the pressure sensitive sheet 20 at a set time interval from the start to the end of the signature.
  • the signature specifying signal output from the pressure sensitive sheet 20 is an analog signal
  • the signal acquisition unit 11 converts the signature specifying signal into a digital signal and acquires the obtained digital signal. Output to.
  • the detection unit 12 includes a continuous signature specifying signal for each of two signature specifying signals that have been output continuously from among the signature specifying signals that have been output from the start to the end of the signature. The moving distance of the pressed position between them is obtained. And the detection part 12 detects the moving speed of the pressed position by dividing the calculated
  • the detection unit 12 detects the pressure applied to the position pressed at the time of signature by converting the level of each signature identification signal into a pressure value for each signature identification signal.
  • the detection unit 12 detects the shape of the signature written on the pressure-sensitive sheet 20 by connecting the positions specified for each signature specifying signal.
  • the authentication processing unit 13 uses the signature shape detected in addition to the moving speed and pressure detected by the detection unit 12, and the signature written on the pressure-sensitive sheet 20 is It can also be determined whether or not it matches a pre-registered signature.
  • the authentication processing unit 13 first acquires the signature data of each user registered in the signature database 14.
  • the signature data is composed of pressures P1 to Pn, movement speeds V1 to Vn-1 and shapes detected from the start to the end of the signature.
  • FIG. 4 is a diagram showing an example of a signature registered in the signature database in the embodiment of the present invention.
  • n is a natural number and corresponds to the number of signature specifying signals output from the start to the end of the signature.
  • the value of n may differ for every user.
  • the authentication processing unit 13 compares the pressure and moving speed detected by the detection unit 12 from the start to the end of the signature with the signature data of each user, and calculates the probability of matching for each user. .
  • the authentication processing unit 13 compares the shape of the signature of the user whose calculated probability is equal to or greater than the threshold with the shape of the signature detected by the detection unit 12 to calculate the similarity, and the calculated similarity is It is determined whether or not there is a user who exceeds a certain value.
  • the authentication processing unit 13 determines that the written signature matches the pre-registered signature and performs authentication. to approve.
  • the authentication processing unit 13 determines that the written signature is a pre-registered signature. Judge that they do not match and do not allow authentication.
  • the image display unit 15 displays the signature written on the pressure-sensitive sheet 20 in a single color on the screen of the display device 23. Further, the image display unit 15 displays the signature written on the pressure sensitive sheet 20 in a plurality of colors according to the detected pressure on the screen of the display device 30.
  • the image display unit 15 displays the signature written by the display device 23 in a single color for the user 22 who performs the signature, and writes the signature for the administrator 31 by the display device 30.
  • the displayed signature is displayed in color according to the pressure. For this reason, the manager 31 can determine whether there is an unnatural point in the signature while allowing the user 22 to confirm his / her signature.
  • the signature is displayed in a single color for the user 22, it is possible to suppress leakage of the determination criteria in the authentication processing apparatus 10.
  • FIG. 5 is a flowchart showing the operation of the authentication processing apparatus in the embodiment of the present invention.
  • FIGS. 1 to 4 are referred to as appropriate.
  • the authentication processing method is implemented by operating the authentication processing device 10. Therefore, the description of the authentication processing method in the present embodiment is replaced with the following description of the operation of the authentication processing device 10.
  • the signal acquisition unit 11 specifies the signature that the pressure-sensitive sheet 20 has continuously output from the start to the end of the signature by writing on the pressure-sensitive sheet 20 by the user 22.
  • a signal is acquired (step A1).
  • the detection unit 12 obtains the movement distance of the pressed position for each of the two signature identification signals that have been output in succession using the signature identification signal acquired in step A1, and further obtained The moving distance is divided by the set time interval to detect the moving speed of the pressed position (step A2).
  • the detection unit 12 detects the pressure applied to the position pressed at the time of signature by converting the level of each signature identification signal into a pressure value for each signature identification signal (step A3). Subsequently, the detecting unit 12 detects the shape of the signature written on the pressure-sensitive sheet 20 by connecting the positions specified for each signature specifying signal (step A4).
  • the authentication processing unit 13 uses the moving speed, pressure, and shape detected in steps A2 to A4, and the signature written on the pressure sensitive sheet 20 and the signature registered in the signature database 14 in advance. Are compared (step A5).
  • the image display unit 15 displays the signature in a single color on the screen of the display device 23, and displays the signature in a plurality of colors on the screen of the display device 30.
  • the authentication process part 13 determines whether the signature written on the pressure sensitive sheet 20 and the signature previously registered correspond based on the comparison result in step A5 (step A6). .
  • step A6 If it is determined in step A6 that the two signatures to be compared match, the authentication processing unit 13 permits authentication of the user 22 who has signed (step A7). On the other hand, as a result of the determination in step A6, if the two signatures to be compared do not match, the authentication processing unit 13 disallows authentication of the user 22 who has signed (step A8).
  • the detection unit 12 specifies a plurality of pressed positions for each signature specifying signal.
  • the detection unit 12 sets the position where the pressure is the highest among the identified pressed positions as the signature position, and sets the position outside the setting range around the signature position. , A position for assisting the signature (hereinafter referred to as “signature assist position”). Then, the detection unit 12 detects the moving speed and the pressure for the position serving as the signature, and further detects the positional relationship between the position serving as the signature and the signature auxiliary position.
  • the signature database 14 also registers the positional relationship described above for each signature. Therefore, the authentication processing unit 13 can further determine whether the signature written on the pressure-sensitive sheet matches the pre-registered signature by further using the detected positional relationship. For example, it may be determined whether the positional relationship between the detected signature and the signature auxiliary position matches the positional relationship between the signature registered in advance and the signature auxiliary position. Alternatively, it may be determined whether or not the area and pressure of the detected signature auxiliary position match the area and pressure of the signature auxiliary position registered in advance. According to this modification, the authentication accuracy can be further improved.
  • the image display unit 15 displays the signature written on the pressure-sensitive sheet on the screen of the display device 23, and writes the signature on the pressure-sensitive sheet on the screen of the display device 30.
  • the signed signature and the image representing the signature auxiliary position can be displayed.
  • the administrator 31 can determine whether there is any unnatural point in the signature by the user 22 even by confirming the signature auxiliary position. For example, when there is no grounding of the hand or wrist, the manager 31 may determine that the signature is unnatural.
  • the program in the present embodiment may be a program that causes a computer to execute steps A1 to A8 shown in FIG.
  • the authentication processing device 10 and the authentication processing method in the present embodiment can be realized.
  • the processor of the computer functions as the signal acquisition unit 11, the detection unit 12, the authentication processing unit 13, and the image display unit 15, and performs processing.
  • the signature database 14 is stored in a storage device such as a hard disk provided in the computer by storing data files constituting them, or the recording medium storing the data file is used as a computer. This can be realized by mounting on a connected reader.
  • the program in the present embodiment may be executed by a computer system constructed by a plurality of computers.
  • each computer may function as any one of the signal acquisition unit 11, the detection unit 12, the authentication processing unit 13, and the image display unit 15.
  • the signature database 14 may be constructed on a computer different from the computer that executes the program in the present embodiment.
  • FIG. 6 is a block diagram illustrating an example of a computer that implements the authentication processing apparatus according to the embodiment of the present invention.
  • the computer 110 includes a CPU (Central Processing Unit) 111, a main memory 112, a storage device 113, an input interface 114, a display controller 115, a data reader / writer 116, a communication interface 117, Is provided. These units are connected to each other via a bus 121 so that data communication is possible.
  • the computer 110 may include a GPU (Graphics ProcessingicsUnit) or an FPGA (Field-Programmable Gate Array) in addition to or instead of the CPU 111.
  • the CPU 111 performs various operations by developing the program (code) in the present embodiment stored in the storage device 113 in the main memory 112 and executing them in a predetermined order.
  • the main memory 112 is typically a volatile storage device such as a DRAM (Dynamic Random Access Memory).
  • the program in the present embodiment is provided in a state of being stored in a computer-readable recording medium 120. Note that the program in the present embodiment may be distributed on the Internet connected via the communication interface 117.
  • the storage device 113 includes a hard disk drive and a semiconductor storage device such as a flash memory.
  • the input interface 114 mediates data transmission between the CPU 111 and an input device 118 such as a keyboard and a mouse.
  • the display controller 115 is connected to the display device 119 and controls display on the display device 119.
  • the data reader / writer 116 mediates data transmission between the CPU 111 and the recording medium 120, and reads a program from the recording medium 120 and writes a processing result in the computer 110 to the recording medium 120.
  • the communication interface 117 mediates data transmission between the CPU 111 and another computer.
  • the recording medium 120 include a general-purpose semiconductor storage device such as CF (CompactFlash (registered trademark)) and SD (Secure Digital), a magnetic recording medium such as a flexible disk (Flexible Disk), or a CD-ROM.
  • Optical recording media such as (Compact Disk Read Only Memory)
  • the authentication processing apparatus 10 in the present embodiment can be realized by using hardware corresponding to each unit, not a computer in which a program is installed. Furthermore, part of the authentication processing device 10 may be realized by a program, and the remaining part may be realized by hardware.
  • a signal acquisition unit that acquires a signal specifying the pressed position and the pressure applied to the position, which is output from the pressure-sensitive sheet when a written signature is made on the pressure-sensitive sheet; Based on the acquired signal, the pressed position is specified, and the movement speed of the specified pressed position and the pressure applied to the specified pressed position from the start to the end of the writing. And at least a detection unit for detecting, Using the detected moving speed and pressure, it is determined whether or not the signature written on the pressure sensitive sheet matches a pre-registered signature.
  • An authorized authentication processor An authentication processing device comprising:
  • the detection unit is Determining the moving distance of the pressed position between successive signals, detecting the moving speed of the pressed position by dividing the determined moving distance by the time interval; and For each signal, the pressure applied to the pressed position is detected by converting the level of the signal into a pressure value.
  • the authentication processing device according to attachment 1.
  • the detection unit detects the shape of the signature written on the pressure-sensitive sheet by connecting each pressed position specified for each signal, The authentication processing unit further determines whether the signature written on the pressure-sensitive sheet matches a pre-registered signature by further using the detected signature shape; The authentication processing device according to attachment 2.
  • the detection unit specifies a plurality of pressed positions for each signal, Among the plurality of pressed positions, the position where the pressure is highest is the position serving as the signature, and the position outside the setting range around the position serving as the signature is the position serving as an assist for the signature. , Detecting the moving speed and the pressure for the position serving as the signature, and further detecting a positional relationship between the position serving as the signature and a position assisting the signature; The authentication processing unit further uses the detected positional relationship to determine whether the signature written on the pressure-sensitive sheet matches a pre-registered signature, The authentication processing device according to any one of appendices 1 to 3.
  • step (b) when the plurality of pressed positions are specified for each signal, Among the plurality of pressed positions, the position where the pressure is highest is the position serving as the signature, and the position outside the setting range around the position serving as the signature is the position serving as an assist for the signature. , Detecting the moving speed and the pressure for the position serving as the signature, and further detecting a positional relationship between the position serving as the signature and a position assisting the signature; In the step (c), it is further determined whether the signature written on the pressure-sensitive sheet matches the signature registered in advance by further using the detected positional relationship. 10.
  • the authentication processing method according to any one of 9.
  • step (b) when the plurality of pressed positions are specified for each signal, Among the plurality of pressed positions, the position where the pressure is highest is the position serving as the signature, and the position outside the setting range around the position serving as the signature is the position serving as an assist for the signature. , Detecting the moving speed and the pressure for the position serving as the signature, and further detecting a positional relationship between the position serving as the signature and a position assisting the signature; In the step (c), it is further determined whether the signature written on the pressure-sensitive sheet matches the signature registered in advance using the detected positional relationship.
  • the computer-readable recording medium according to any one of 15.
  • the present invention it is possible to improve the accuracy of authentication when authenticating a self-written signature by digital processing.
  • the present invention is useful in all fields where authentication processing is required.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Collating Specific Patterns (AREA)
  • User Interface Of Digital Computer (AREA)

Abstract

La présente invention concerne un dispositif de traitement d'authentification (10) qui comprend : une unité d'acquisition de signal (11) qui acquiert un signal délivré en sortie par une feuille sensible à la pression (20), le signal spécifiant une position pressée et la pression appliquée à la position, lorsqu'une signature est réalisée par écriture sur la feuille sensible à la pression (20); une unité de détection (12) qui spécifie la position pressée sur la base du signal acquis, et détecte au moins la vitesse de déplacement à la position pressée spécifiée et la pression appliquée à la position pressée spécifiée à partir du début de l'écriture jusqu'à la fin; et une unité de traitement d'authentification (13) qui détermine, à l'aide de la vitesse et de la pression de déplacement détectées, si la signature écrite sur la feuille sensible à la pression correspond à une signature préenregistrée, et permet une authentification lorsque les signatures concordent.
PCT/JP2018/003046 2017-02-21 2018-01-30 Dispositif et procédé de traitement d'authentification, et support d'enregistrement lisible par ordinateur WO2018155107A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06333028A (ja) * 1993-05-21 1994-12-02 Sigma Corp 本人識別管理システム
JPH0927031A (ja) * 1995-07-10 1997-01-28 Hitachi Vlsi Eng Corp 図形判定方法および装置
JP2016505907A (ja) * 2013-10-25 2016-02-25 株式会社ワコム 手書きデータ出力方法及びコンピュータシステム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06333028A (ja) * 1993-05-21 1994-12-02 Sigma Corp 本人識別管理システム
JPH0927031A (ja) * 1995-07-10 1997-01-28 Hitachi Vlsi Eng Corp 図形判定方法および装置
JP2016505907A (ja) * 2013-10-25 2016-02-25 株式会社ワコム 手書きデータ出力方法及びコンピュータシステム

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