WO2018040009A1 - 签名认证方法、终端、手写笔及系统 - Google Patents

签名认证方法、终端、手写笔及系统 Download PDF

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Publication number
WO2018040009A1
WO2018040009A1 PCT/CN2016/097645 CN2016097645W WO2018040009A1 WO 2018040009 A1 WO2018040009 A1 WO 2018040009A1 CN 2016097645 W CN2016097645 W CN 2016097645W WO 2018040009 A1 WO2018040009 A1 WO 2018040009A1
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WIPO (PCT)
Prior art keywords
signature
stylus
data
information
user
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PCT/CN2016/097645
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English (en)
French (fr)
Inventor
李茹
吴黄伟
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201680028530.4A priority Critical patent/CN108139856B/zh
Priority to PCT/CN2016/097645 priority patent/WO2018040009A1/zh
Publication of WO2018040009A1 publication Critical patent/WO2018040009A1/zh

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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
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures

Definitions

  • the present invention relates to the field of stylus signature authentication technologies, and in particular, to a signature authentication method, a terminal, a stylus, and a system.
  • the stylus signature technology has become an important technology for confirming the identity of users in the virtual environment of network systems.
  • the user uses the stylus to input a handwritten signature on the touch panel of the terminal for authentication, and the terminal detects the relevant data of the handwritten signature through the touch panel and the sensor.
  • the terminal compares and matches the detected data of the signature and the pre-stored signature template data to identify the authenticity of the signature, and determines whether the user inputs the handwritten signature authentication.
  • the relevant data of the signature detected by the terminal includes information such as signature image information and pressure information of the stylus on the touch panel.
  • Embodiments of the present invention relate to a signature authentication method, a terminal, a stylus, and a system, which improve the security of a handwritten signature authentication system.
  • an embodiment of the present invention provides a signature authentication method, where the method includes: when a user signs a touch panel on a touch panel of a terminal, the terminal detects the first signature data, a signature data includes coordinate information of a contact point of the stylus and the touch panel and pressure information of the stylus on the touch panel at the contact point; and the terminal receives second signature data sent by the stylus, the second signature data including stylus detection The trajectory information of the stylus and the pressure information of the user on the stylus when the user signs on the touch panel through the stylus. Matching the first signature data and the second signature data with the pre-stored signature template data to obtain a matching ratio. When the matching rate is not lower than the preset matching rate threshold, the signature authentication is passed.
  • the user In the process of the user inputting the handwritten signature on the touch panel of the terminal by using the stylus, the user extracts more user signature feature data through the stylus, compares and matches, increases the difficulty of the attacker to imitate the user signature information, and improves the signature authentication. System security.
  • the first signature data is synchronized with the sampling time and the sampling frequency of the second signature data.
  • the signature authentication system provided by the embodiment of the invention enables the attacker to imitate the user's handwriting while simulating the user's hand movement, thereby greatly improving the security of the signature authentication system.
  • the signature corresponds to the first signature feature point and the second signature feature point
  • the first signature feature point includes at least one of the set of contact points
  • the second signature feature point includes the stylus touch At least one of a set of points in a motion trajectory of the area outside the panel; extracting data corresponding to the first signature feature point and the second signature feature point from the first signature data and the second signature data; and the first signature feature point
  • the data corresponding to the second signature feature point is matched with the data of each feature point in the signature template data to obtain a matching ratio.
  • the data corresponding to the first signature feature point includes: coordinate information of the contact point corresponding to the first signature feature point, and pressure information of the stylus on the touch panel at the contact point corresponding to the first signature feature point And the position information of the stylus and the pressure information of the user on the stylus when the sampling time is the same as the sampling time of the first signature feature point; wherein the position information of the stylus is obtained by the trajectory information of the stylus.
  • the data corresponding to the second signature feature point includes: location information of the stylus corresponding to the second signature feature point and pressure information of the user on the stylus.
  • the second signature data further includes: an stylus detection of the acceleration of the stylus when the user signs on the touch panel by the stylus, the pressure area information of the stylus subject to the user pressure, and the pressure The shape information of the area and the distance information of the stylus compression area from the stylus end.
  • the first signature feature point specifically includes one or more of the following points, a first contact point, a last contact point, a discontinuous contact point, or a contact point having a large curvature change.
  • the discontinuous contact points correspond to the starting points of different strokes in the signature.
  • the point where the curvature transformation is large corresponds to the bending point in the stroke.
  • the second signature feature point specifically includes one or more of the following points: a point in the curve corresponding to the motion track of each segment of the discontinuous stylus in the area other than the touch panel; Or a point in the curve corresponding to the motion track of each segment of the discontinuous stylus in the area other than the touch panel that is the farthest from the touch panel.
  • the point of curvature of the curve corresponding to the motion track of each segment of the stylus is the point with the largest curvature, or the point corresponding to the motion track of each segment of the discontinuous stylus is the distance from the touch panel corresponding to the distance between the two strokes The highest point of the stylus.
  • the first signature feature point is extracted from the contact point; the motion track of the stylus pen end is projected on the first plane where the touch panel is located, and the first motion track of the stylus pen end is obtained; The motion track of the pen end is projected on the second plane and the third plane perpendicular to the first plane, and the second motion track and the third motion track of the pen end of the stylus are obtained, and the second plane is perpendicular to the third plane; Extracting a second signature feature point from at least one of the second motion trajectory and the third motion trajectory; extracting data corresponding to the first signature feature point and the second signature feature point from the first signature data and the second signature data ; will be the first signature feature point and the second sign The data corresponding to the feature points is matched with the data of each feature point in the signature template data to obtain a matching rate.
  • the matching rate threshold is preset according to the environment in which the terminal is located.
  • different matching rate thresholds may be set according to the environment of the terminal, which can meet the actual needs of the user, and has a good application prospect.
  • an embodiment of the present invention provides a signature authentication method, where the method includes: when a user signs on a touch panel of a terminal by using a stylus, the stylus detects second signature data, and the second signature data includes a stylus The motion track information and the pressure information of the user on the stylus; the stylus sends the second signature data to the terminal, so that the terminal determines whether the signature authentication passes according to the second signature data and the first signature data detected by the terminal, and the first signature data The coordinate information of the contact point of the stylus and the touch panel and the pressure information of the stylus on the touch panel at the contact point.
  • the second signature data further includes: an stylus detection of the acceleration of the stylus when the user signs on the touch panel by the stylus, the pressure area information of the stylus subject to the user pressure, and the pressure The shape information of the area and the distance information of the stylus compression area from the stylus end.
  • the second signature feature data reflects the user's hand motion characteristics.
  • the strength, shape, and distance of the pen area from the pen end may be a difference in the strength, shape, and distance of the pen area from the pen end.
  • the first signature data is synchronized with the sampling time and the sampling frequency of the second signature data.
  • an embodiment of the present invention provides a terminal, where the terminal includes: a touch panel, a display panel, a sensor, a processor, a memory, and a communication unit.
  • a touch panel for receiving a signature input by a user through a stylus.
  • a display panel for displaying a signed image.
  • the touch panel is also used to detect coordinate information of a contact point of the stylus and the touch panel.
  • the sensor is configured to detect pressure information of the stylus on the touch panel at the contact point; the coordinate information of the contact point and the pressure information of the stylus on the touch panel at the contact point constitute the first signature data.
  • a communication unit configured to establish a communication connection with the stylus, and receive second signature data sent by the stylus, where the second signature data includes trajectory information of the stylus when the user performs signature on the touch panel by the stylus and User pressure information on the stylus.
  • a memory for storing a preset match rate threshold.
  • a processor configured to match the first signature data and the second signature data with the pre-stored signature template data to obtain a matching ratio; and when the matching ratio is not lower than the preset matching rate threshold, the indication display panel displays the signature authentication Prompt message.
  • the display panel is also used to display the prompt information passed by the signature authentication.
  • the processor is further configured to send, to the stylus, control information about the sampling time and the sampling frequency of the stylus to control the sampling time and the sampling frequency of the first signature data and the second signature data. Synchronize.
  • the signature corresponds to the first signature feature point and the second signature feature point
  • the first signature feature point includes at least one of the set of contact points
  • the second signature feature point includes the stylus touch At least one of the set of points in the motion track of the area outside the panel
  • the processor specifically for extracting data corresponding to the first signature feature point and the second signature feature point from the first signature data and the second signature data; Matching the data corresponding to the first signature feature point and the second signature feature point with the data of each feature point in the signature template data to obtain a matching ratio.
  • the processor is configured to extract a first signature feature point from the contact point, and project a motion track of the stylus pen end on the first plane of the touch panel to obtain the first end of the stylus pen
  • the trajectory of the stylus pen is projected on the second plane and the third plane perpendicular to the first plane to obtain a second motion trajectory and a third motion trajectory of the stylus pen end, and the second plane is perpendicular to the third plane
  • the processor is further configured to determine an environment in which the terminal is located according to the network connected to the communication unit, and preset a matching rate threshold according to an environment in which the terminal is located.
  • an embodiment of the present invention provides a stylus pen, including: a sensor unit, a processor, and a communication unit.
  • the sensor unit is configured to detect motion track information of the stylus and pressure information of the user on the stylus when the user signs on the touch panel of the terminal through the stylus.
  • the processor is configured to convert the motion track information of the stylus and the pressure information of the user to the stylus into the second signature data that the terminal can process, and instruct the communication unit to send to the terminal.
  • a communication unit configured to establish a communication connection with the terminal, and send the second signature data to the terminal.
  • the sensor unit is further configured to detect acceleration of the stylus, pressure area information of the stylus subject to user pressure, and a pressure receiving area when the user signs on the touch panel of the terminal through the stylus pen.
  • the communication unit is further configured to receive, by the terminal, control information about a sampling time and a sampling frequency of the sensor unit, to control a sampling time of the first signature data and the second signature data. Keep in sync with the sampling frequency.
  • an embodiment of the present invention provides a signature authentication system, including the terminal provided by the foregoing third aspect, and the stylus provided by the foregoing fourth aspect.
  • the signature authentication method, the terminal, the stylus and the system provided by the embodiment of the invention simultaneously detect the relevant data of the signature, compare and match the signature related data with the pre-stored signature template data, and determine whether the signature authentication is based on the matching rate. by.
  • the user extracts more user signature feature data through the stylus, and compares and matches, so that the attacker imitates the user's handwriting while simulating the user.
  • the hand movements increase the difficulty of the attacker to imitate the user's signature information, greatly increasing the signature recognition. The security of the system.
  • FIG. 1 is a schematic structural diagram of a signature authentication system according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a terminal architecture provided by an implementation of the present invention.
  • FIG. 3 is a schematic structural diagram of a stylus according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a coordinate system and a signature of a signature authentication system according to an embodiment of the present invention
  • FIG. 5 is a signaling interaction diagram of a signature authentication system method according to an embodiment of the present invention.
  • the "attacker” referred to in the embodiment of the present invention refers to a feature that attempts to imitate the handwritten signature input by the user, and imitates the relevant features of the user's hand movement, such as the user's handwritten signature, to authenticate the terminal through the terminal.
  • the "other user” referred to in the embodiment of the present invention refers to the user A who inputs the handwritten signature A, and the “other user” is different from the user A who inputs the handwritten signature A.
  • Each user has a one-to-one correspondence with the related data of the user's handwritten signature.
  • A refers to any user.
  • the "contact point” referred to in the embodiment of the present invention refers to a contact point of the stylus and the touch panel. It can be understood that the contact points of the stylus and the touch panel constitute a handwritten signature image.
  • the "motion track” of the stylus mentioned in the embodiment of the present invention refers to a curve composed of points corresponding to a point on the stylus at different positions in space.
  • the curve formed by the different points of the stylus pen end in the space is the motion track of the stylus pen end.
  • the "holding pen posture” of the user mentioned in the embodiment of the present invention refers to a pressed area and/or a pressed shape in which the stylus is subjected to pressure when the user holds the pen.
  • the "hold strength” of the user mentioned in the embodiment of the present invention refers to pressure information on the stylus when the user holds the pen. It should be noted that different users may correspond to feature information such as different grip postures and grip strength.
  • the "curvature” referred to in the embodiment of the present invention refers to a value of the degree of bending of a curve at a certain point.
  • the "point with a large curvature change” refers to a point where the curvature bending transformation is more conspicuous. For example, for a specific word in the signature, the stroke “vertical hook ( ⁇ )" has two points with large curvature changes. The stroke “horizontal-” does not have a point where the curvature changes greatly.
  • the “matching rate” mentioned in the embodiment of the present invention refers to the degree of matching between data and data.
  • the “matching rate threshold” referred to in the embodiment of the present invention refers to a matching rate threshold (matching rate threshold) that the terminal can preset when the user inputs the handwritten signature for authentication.
  • the terminal may determine that the user's handwritten signature authentication passes. For example, if the matching rate threshold is 70%, and the matching rate between the data of the user's handwritten signature calculated by the terminal and the signature template data is 75%, the terminal determines that the user's handwritten signature authentication passes because 75%>70%.
  • the "preset” mentioned in the embodiment of the present invention refers to a preset.
  • the “preset match rate threshold” refers to a preset match rate threshold before the user inputs the handwritten signature for authentication to determine whether the authentication is passed.
  • the "first signature data” mentioned in the embodiment of the present invention refers to related data of the signature detected by the terminal, such as image information of the signature, pressure information of the stylus to the touch panel of the terminal, and the like.
  • the “second signature data” mentioned in the embodiment of the present invention refers to the relevant data of the signature detected by the stylus, for example, the pressure information of the user on the stylus and the motion track information of the stylus during the process of inputting the handwritten signature by the user through the stylus Wait.
  • the "time relationship” mentioned in the embodiment of the present invention refers to the detection time relationship of "first signature data” and "second signature data". For example, when the sampling time and the sampling frequency of the touch panel and the stylus are kept synchronized, the first signature data and the second signature data corresponding to the same sampling time are corresponding.
  • the "spatial relationship” referred to in the embodiment of the present invention refers to the spatial positional relationship of points corresponding to "first signature data” and "second signature data". It can be understood that when the stylus end is in contact with the touch panel, in the same coordinate system, the stylus pen end is located at the same position as the contact point.
  • the "feature point” referred to in the embodiment of the present invention refers to a representative point in the user's handwritten signature image. Take the user's handwritten signature as the Chinese name, and the user's last name and name are composed of strokes. Different strokes may be discontinuous. Each user's writing habits and writing sizes are different. But the strokes of each "word" in the signature are fixed. Therefore, the starting point of each stroke of the user's handwritten signature can be selected as the feature point of the user's handwritten signature. The starting point of each stroke is embodied as a discontinuous contact point detected by the touch panel.
  • the "signature feature point” referred to in the embodiment of the present invention refers to a representative feature point extracted from the feature point corresponding to the first signature data and the feature point corresponding to the second signature data.
  • the point at which the stylus contacts the touch panel is a first feature point
  • the point of the stylus outside the touch panel is a second feature point.
  • the "signature feature point” includes one or more of the contact points of the stylus and the touch panel, the first contact point, the last contact point, the discontinuous contact point, and the contact point where the curvature changes greatly.
  • the "signature feature point” also includes a point at which the stylus is farthest from the touch panel in the stylus motion track corresponding to the two discontinuous contact points.
  • the farthest distance of the stylus from the touch panel during the pen stylus can reflect the writing habits of different users to some extent. For example, in the process of inputting a handwritten signature by a user, when a discontinuous stroke is input, the stylus needs to be lifted to leave the touch panel, wherein the distance between the two strokes and the farthest point of the stylus driven by the different user is away from the touch panel. different.
  • the "security level” mentioned in the embodiment of the present invention refers to the security situation of the environment in which the signature authentication system is located.
  • signature authentication is relatively safe for the user.
  • the user needs to enter a handwritten signature on the touch panel of his personal computer to turn on usage rights.
  • the security level is relatively high.
  • the security levels of different environments in which the signature authentication system is located may be distinguished by “first”, “second”, “third”, and the like. Among them, the "first” can be set to the highest security level, and the level is lowered in turn. For example, the home or the car is the “first security level”, the office is the “second security level”, and the outdoor is the “third security level”.
  • a relatively low matching rate threshold can be set to better adapt to the user's needs.
  • different matching rate thresholds may be preset according to different security levels. When the first security level is used, the matching rate threshold is preset to 60%. At the second security level, the match rate threshold is preset to 70%. At the third security level, the match rate threshold is preset to 80%. It can be understood that the specific security level division manner and the matching rate threshold value can be adjusted as needed, and will not be described here.
  • first”, “second”, “third”, etc. are only used to distinguish different data, signature feature points or security levels, and should not be construed as being Specific definition of data, signature feature points, or security levels.
  • FIG. 1 is a schematic structural diagram of a signature authentication system according to an embodiment of the present invention.
  • the terminal 100 and the stylus pen 200 are included.
  • the terminal 100 includes a touch panel.
  • the user inputs the handwritten signature on the touch panel of the terminal 100 using the stylus pen 200, and the terminal 100 detects the signature image information and the related data of the handwritten signature such as the pressure information of the stylus pen 200 to the terminal 100; meanwhile, the stylus 200 detects the motion trajectory of the stylus pen 200.
  • the information related to the handwritten signature such as the information and the user's pressure information on the stylus 200 is transmitted to the terminal 100.
  • the terminal 100 detects the matching ratio between the data related to the handwritten signature input by the user and the signature template data, and the terminal 100 confirms the handwritten signature authentication input by the user when the matching rate is not lower than the preset matching rate threshold. by.
  • the terminal 100 may allow the user to continue to access the relevant rights of the corresponding function of the terminal 100.
  • the related data of the handwritten signature input by the user may include image information of the signature detected by the terminal 100, pressure information of a contact point of the stylus pen 200 and the touch panel. And stylus 200 check The measured user inputs the pressure information of the stylus pen 200 and the trajectory information of the stylus pen 200 during the handwritten signature process.
  • the data related to the detection of the handwritten signature by the terminal 100 is classified into the first signature data.
  • the data related to the detection of the handwritten signature by the stylus 200 is classified as the second signature data.
  • the stylus 200 transmits the second signature data it detects to the terminal 100 via the communication link 300.
  • the terminal when the user inputs the handwritten signature by using the stylus, the terminal detects the first signature data, and at the same time, the stylus detects the second signature data and sends the second signature data to the terminal.
  • the terminal determines whether the handwritten signature input by the user passes the authentication according to the first signature data and the second signature data and the pre-stored signature template data.
  • the signature template data is data related to the handwritten signature detected by the terminal 100 and the stylus 200 when the user pre-enters the handwritten signature.
  • the terminal 100 saves the signature template data in the memory, and calls the signature template data stored in the memory during the process of the user inputting the handwritten signature for authentication.
  • the processor of the terminal 100 may perform feature point data extraction on the related data of the handwritten signature to facilitate comparison.
  • the signature template data also corresponds to the data of the relevant signature feature points.
  • the speed of the user entering the handwritten signature may be different each time. If the user used the handwritten signature 1S last time, the next time you enter the handwritten signature, it may take 0.8S. However, each user's handwritten signature has its comparable attributes, such as the signature image corresponding to the different signatures of the user. Therefore, the handwritten signatures are compared by the data of the feature points.
  • the processor of terminal 100 may extract the first contact point, the last contact point, the discontinuous contact point, the contact point with a large curvature change, etc. as the first signature feature point.
  • Data such as contact point coordinates corresponding to the signature feature point, pressure of the stylus on the touch panel, coordinates of the stylus, pressure of the user on the stylus, and the like are extracted as data of the first signature feature point.
  • the processor of the terminal 100 can also use the point where the stylus is located outside the touch panel as the signature feature point. example For example, the terminal 100 extracts a point where the stylus is farthest from the touch panel within the sampling time interval corresponding to the two discontinuous contact points as the second signature feature point. Data such as coordinates of the stylus corresponding to the signature feature point, pressure of the user on the stylus, and the like are extracted as data of the second signature feature point.
  • the user inputs a handwritten signature on the touch panel of the terminal 100 through the writing pen 200, and the terminal 100 displays the signature image through the display panel.
  • the display panel is instructed to display the prompt information of the authentication pass.
  • the stylus 200 and the terminal 100 can implement information interaction via the communication link 300.
  • the communication link 300 herein may be one or more of a WiFi network, a USB interface, a Bluetooth connection, or an infrared connection.
  • the stylus 200 interacts with the information of the terminal 100. Including: the stylus 200 transmits relevant data of the detected handwritten signature to the terminal 100 via the communication link 300, and/or the terminal 100 transmits control of the sampling time and sampling frequency of the stylus 200 to the stylus 200 via the communication link 300. information.
  • the touch panel can detect coordinate information of a contact point of the stylus pen 200 with the touch panel.
  • the pressure information of the stylus 200 on the touch panel at the contact point can be detected by integrating a pressure sensor on the touch panel.
  • the stylus pen 200 can detect the motion trajectory information of the stylus pen 200 by integrating an acceleration sensor, a magnetic field strength sensor, an angular velocity sensor, or the like.
  • the stylus pen 200 can detect the pressure information of the user on the stylus pen 200 through the pressure sensor.
  • the preset matching rate threshold can be adjusted according to actual needs.
  • the matching rate threshold can be set according to the security level. You can also set the match rate threshold directly.
  • the terminal 100 can determine the environment in which the terminal 100 is located by detecting the network to which it is connected. Further determine the corresponding security level and matching rate threshold.
  • the pressure information of the stylus detected by the user of the stylus reflects the strength of the user's grip.
  • the data related to the handwritten signature input by the user may further include: a pressed area and/or a pressed shape information of the stylus detected by the stylus 200 by the user's pressure. Where the stylus is under user pressure
  • the pressed area and/or the pressed shape reflect the posture of the user holding the pen (stylus). For example, the user g1 is accustomed to holding the pen with the thumb and the index finger, by pre-storing the pressure information of the stylus when the user g1 holds the pen with the thumb and the index finger, and the pressed area and/or the pressed shape of the stylus to the user.
  • g1 enters the handwritten signature again for authentication it compares with the pre-stored user g1 whether the grip strength and the grip gesture match.
  • the user's pen posture can be obtained by using a pressure sensor or a combination of a touch sensor.
  • the related data of the handwritten signature input by the user may further include: the acceleration of the stylus motion detected by the stylus pen 200.
  • the acceleration of the stylus pen end may be further included.
  • the acceleration of the stylus pen end can be obtained by the above acceleration sensor. It can also be calculated from the trajectory of the stylus.
  • the related data of the handwritten signature input by the user may further include: distance information of the pressed area of the stylus 200 from the pen end of the stylus.
  • the distance between the pressed area of the stylus and the pen end of the stylus reflects the habit of different users. For example, some users prefer to hold the middle of the pen for writing. Some users like to hold the upper end of the pen, write, and so on.
  • the security level or the matching rate threshold of the environment in which the user is located may be input to the terminal 100 by other users.
  • the user C handles related services in the bank
  • the user needs to input a handwritten signature for identity authentication.
  • the other user is the bank worker D, and the bank worker D can input the terminal 100 according to actual needs.
  • the matching rate threshold of the user C when performing handwritten signature authentication.
  • the stylus 200 can be integrated on the terminal 100, for example, the terminal 100 is provided with a slot, and the stylus 200 can be inserted into the terminal 100. When the user signs, the stylus 100 is pulled out and used. To simplify the description, the embodiment of the present invention is described by taking the stylus 200 separately from the terminal 100 as an example.
  • the terminal 100 may be a smart phone with a touch screen or a terminal with a touch screen.
  • the touch screen/touch panel can be separated from the terminal, and the touch screen is integrated into one body.
  • the touch screen can also be called a tablet.
  • the signature authentication system will include a touch screen (writing pad), a terminal, and a stylus.
  • the touch screen is configured to receive the user's handwritten signature and detect the information of the signature image, and the pressure sensor is integrated on the touch screen to detect the pressure information of the stylus.
  • the touch screen records the relevant data of the handwritten signature and sends it to the terminal.
  • the embodiment of the invention is only described by taking the touch screen and the terminal integrated as an example.
  • the signature data detected by the embodiment of the present invention includes the image information of the signature detected by the terminal and the pressure information of the stylus to the terminal, and the motion track information of the stylus when the user inputs the signature using the stylus and the pressure of the user on the stylus. information.
  • the signature authentication system provided by the embodiment of the present invention extracts more user signature feature data through the stylus in the process of using the stylus signature, and compares and matches, so that the attacker imitates the user's handwriting while simulating the user.
  • the hand movements increase the difficulty of the attacker to imitate the signature data, and greatly improve the security of the signature authentication system.
  • the embodiment of the present invention further provides a terminal, which is used to implement the system provided in the foregoing embodiment.
  • the terminal includes components such as a display screen 110, a sensor 120, an I/O subsystem 130, a processor 140, a memory 150, a communication unit 160, and a power source 170.
  • the specific components of the terminal 100 will be specifically described below with reference to FIG. 2:
  • the display screen 110 is configured to accept a user input of a handwritten signature, and is also used for displaying a handwritten signature image input by the user or prompting information for displaying a handwritten signature authentication result input by the user and various menus of the terminal 100.
  • the specific display screen 110 may include a touch panel 111 and a display panel 112.
  • the touch panel 111 can collect contact or non-contact operations on or near the user.
  • the user operates on the touch panel 111 or near the touch panel 111 using any suitable object such as a stylus (stylus).
  • the touch panel 111 may include two parts of a touch detection device and a touch controller.
  • the touch detection device detects the touch orientation and posture of the stylus, detects a signal caused by the touch operation, and transmits a signal to the touch controller.
  • the touch controller receives touch information from the touch detection device and converts it into a letter that the processor 140 can process interest. Additionally, the touch controller can receive commands from processor 140 and execute them.
  • the touch controller converts the touch orientation of the touch point of the stylus and the touch panel 111 detected by the touch detection device into coordinate information of the contact point, and transmits the coordinate information of the contact point to the processor 140.
  • the touch panel 111 can cover the display panel 112, and the user can operate on or near the touch panel 111 covered on the display panel 112 according to the content displayed by the display panel 112, and the touch panel 111 detects the operation on or near the touch panel 111. Thereafter, the I/O subsystem 130 transmits to the processor 140 to determine user input, and the processor 140 then provides a corresponding visual output on the display panel 112 via the I/O subsystem 130 based on the user's input.
  • the touch panel 111 and the display panel 112 are implemented as two separate components to implement the input and input functions of the terminal 100, in some embodiments, the touch panel 111 may be integrated with the display panel 112. Input and output functions of the terminal 100.
  • the I/O subsystem 130 may include a display controller 131, a sensor controller 132, and other input device controllers 133.
  • the display controller 131 receives signals from the display screen 110 and/or transmits signals to the display screen 110. After the display screen 110 detects the handwritten signature information input by the user, the display controller 131 converts the detected handwritten signature information input by the user into an interaction with the user interface object displayed on the display screen 110. For example, the display controller 131 converts the handwritten signature information input by the user into a handwritten signature image displayed on the display panel 112, thereby realizing human-computer interaction.
  • Sensor controller 132 may receive signals from one or more sensors 120 and/or send signals to one or more sensors 120.
  • Terminal 100 may also include at least one type of sensor 120, such as pressure sensor 121 and other sensors 122.
  • the pressure sensor 121 is configured to detect pressure information received by the terminal 100.
  • the pressure sensor 121 may be integrated in the display screen 110 to detect pressure information of the stylus pen on the touch panel 111 and sent to the processor 140 through the sensor controller 132.
  • the pressure sensor 121 is disposed between the touch panel 111 and the display panel 112, or the pressure sensor 121 is overlaid on the touch panel 111, so that the pressure sensor 121 detects the pressure information of the stylus pen on the touch panel 111.
  • the coordinate information of the contact point detected by the touch panel 111 and the pressure information of the stylus pen to the touch panel 111 detected by the pressure sensor 121 may be unified into the first signature data detected by the terminal 100.
  • the processor 140 is a control center of the terminal 100 that connects various portions of the entire terminal using various interfaces and lines, by running or executing software programs and/or modules stored in the memory 150, and recalling data stored in the memory 150, The various functions and processing data of the terminal 100 are performed to perform overall monitoring of the terminal 100.
  • processor 140 may include one or more processing units.
  • the processor 140 can integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, an application, etc., and the modem processor mainly processes wireless communication. It can be understood that the above modem processor may not be integrated into the processor 140.
  • display controller 131 and sensor controller 132 transmit the detected first signature data to the application processor.
  • the stylus 200 detects the second signature data and transmits it to the terminal 100.
  • the second signature data sent by the stylus 200 received by the modem processor is sent to the application processor.
  • the application processor determines whether the handwritten signature authentication input by the user passes according to the first signature data and the second signature data of the handwritten signature by running the software program in the memory 150 and calling the signature template data in the memory 150.
  • the application processor compares the first signature data and the second signature data with the signature template data to obtain a corresponding matching ratio. When the matching rate is not lower than the preset matching rate threshold, the application processor determines that the signature authentication is passed, and instructs the display screen 110 to display the prompt information that the signature authentication passes.
  • the communication unit 160 is configured to implement information interaction between the terminal 100 and an external network or device.
  • a wireless communication module and/or a communication interface can be included.
  • the wireless communication module can be used for receiving and transmitting signals during the process of transmitting and receiving information, for example, a radio frequency circuit or a WiFi module.
  • the communication interface can be used to directly connect with the external device, and the terminal 100 can exchange information with the external device.
  • the communication unit 160 may further include an infrared module, a Bluetooth module, and the like, which can implement the information exchange between the terminal 100 and the external network or device, and is not specifically limited herein.
  • the terminal 100 further includes a power source 170 (such as a battery) for supplying power to the various components.
  • a power source 170 (such as a battery) for supplying power to the various components.
  • the power source 170 can be logically connected to the processor 140 through the power management system, thereby implementing the power management system. Manage functions such as charging, discharging, and power consumption.
  • Terminal 100 may also include other input devices 180 that are coupled to other input device controllers 133 of I/O subsystem 130 for informational interaction with processor 140 under the control of other device input controllers 133. I will not repeat them here.
  • the touch detection device of the touch panel 111 detects the orientation signal of the contact point of the stylus pen 200 with the touch panel 111, and the touch panel 111
  • the touch controller converts the orientation signal of the above contact point into coordinate information, and transmits it to the processor 140 through the display controller 131.
  • the pressure sensor 121 detects the pressure information of the stylus pen 200 on the touch panel 111 at the above-mentioned contact point, and transmits it to the processor 140 through the sensor controller 132. It can be understood that the coordinate information of the above contact point and the pressure information of the contact point can be recorded as the first signature data.
  • the display controller 131 converts the detected handwritten signature input by the user into a signature image displayable on the display screen 110 for the user to view.
  • the terminal 100 receives the second signature data detected by the stylus pen 200 through the communication unit 160.
  • the second signature data includes: when the user inputs the handwritten signature through the stylus 200, the trajectory information of the stylus detected by the stylus 200, the acceleration of the stylus pen end, the pressure area of the stylus subject to the user's pressure, and/or The shape information and the pressure information of the user on the stylus 200 and the like are related information.
  • the processor 140 compares and matches the first signature data and the second signature data with the signature template data pre-stored in the memory 150 to calculate a matching ratio.
  • the processor 140 compares the calculated matching ratio with the matching rate threshold in the pre-existing memory 150. When the calculated matching ratio threshold is not lower than the pre-stored matching rate threshold, the processor 140 determines the handwritten signature authentication of the user. by.
  • the processor 140 instructs the display panel 112 to display prompt information that the user's handwritten signature is authenticated.
  • the terminal 100 processor 140 may extract data of the signature feature points by using the first signature data and the second signature data.
  • the data of the extracted signature feature points is matched with the data of the signature feature points corresponding to the signature template, and the matching rate is calculated.
  • the signature feature point includes a first signature feature point and a second signature feature point.
  • the data of the signature feature point includes the data of the first signature feature point and the second The data of the signature feature point.
  • the user or other user may send an instruction to the processor 140 to indicate the identity information of the user, and the processor 140 may be based on the identity information indicating the user.
  • the instruction calls the signature template data of the user from the memory 150.
  • the instruction indicating the identity information of the user may be information such as the ID number of the user, the job number of the user, and the like.
  • the signature template data of the plurality of users is pre-stored in the memory 150, and the signature template data of each user carries the identity information of the user.
  • the processor 140 queries the memory 150 for the signature template data of the user according to the identity information of the user.
  • the signature template data of each user carries the identity information of the user.
  • each user's signature template data may include a plurality. That is, when the user pre-enters the handwritten signature, the user can input the handwritten signature (template) a plurality of times, and the terminal 100 and the stylus 200 detect the data of each handwritten signature (template) and save them one by one.
  • the processor 140 compares the signature data of the authentication stage detected by the terminal 100 and the stylus 200 with the plurality of signature template data of the user, and selects the largest matching rate of the final one. Compare the matching rate and determine whether the user's signature authentication is passed according to the preset matching rate threshold.
  • the signature template data also includes the first signature (template) data detected by the terminal 100 and the second signature (template) data detected by the stylus 200.
  • the signature template data may include data of the extracted corresponding signature feature points. The specific signature feature points and their data extraction methods can be seen in detail in Figure 4.
  • an embodiment of the present invention further provides a stylus for implementing the system provided in the foregoing embodiment.
  • the stylus includes components such as a sensor unit 210, a communication unit 220, a processor 230, a memory 240, a power source 250, and the like.
  • the stylus 200 will be described below with reference to FIG. The components are specifically introduced:
  • the sensor unit 210 is configured to detect related signature data in a process in which the user inputs the handwritten signature on the touch panel 111 of the terminal 100 using the stylus pen 200.
  • the sensor unit 210 may include an acceleration sensor 211, a magnetic field strength sensor 212, an angular velocity sensor 213, a pressure sensor 214, and other sensors 215.
  • the acceleration sensor 211 can be used to detect the acceleration of the pen end of the stylus 200
  • the magnetic field strength sensor 212 can be used to detect the magnetic field strength of the stylus 200
  • the angular velocity sensor 213 can be used to detect the angular velocity of the stylus 200.
  • the motion trajectory information of the stylus pen 200 can be obtained from the change information of the acceleration, the angular velocity, and the magnetic field strength of the stylus pen 200.
  • the pressure sensor 214 can be used to detect pressure information of the user on the stylus 200.
  • sensors 215 may include sensors such as a gyroscope, a gravity sensor, a WiFi positioning sensor, or an infrared positioning sensor.
  • the acceleration sensor 211, the magnetic field strength sensor 212, and the angular velocity sensor 213 for detecting the motion trajectory information of the stylus pen 200 may be replaced by one or more of the other sensors 215.
  • the embodiment of the present invention does not specifically limit the sensor used to detect the trajectory data of the stylus 200. It can be understood that the sensor or the instrument for detecting the trajectory of the stylus should belong to the protection scope of the embodiment of the present invention.
  • the sensor unit 210 can also detect the pressure area information and the pressure shape information of the stylus subject to the user's pressure through the correlation sensor, and the distance information of the stylus pressure receiving area from the stylus pen end.
  • Related sensors herein may include touch sensors.
  • the above information may also be used as one or more of the second signature data to reflect the pen-holding habits of different users. Through the comparison of the above characteristic information, the attacking difficulty of the attacker is increased.
  • the communication unit 220 is configured to be connected to the foregoing communication unit 160 to implement information interaction between the stylus 200 and the terminal 100.
  • the communication unit 220 may also include a communication module and/or a communication interface corresponding to the communication unit 160.
  • the communication unit 160 includes a WiFi module 1
  • the communication unit 220 includes a corresponding WiFi module 2
  • the terminal 100 and the stylus 200 establish a communication connection through the WiFi module 1 and the WiFi module 2.
  • the processor 230 for executing or executing a software program and/or module stored in the memory 240, performs the replacement of the relevant signature data detected by the sensor unit 210 with information that the terminal 100 can process.
  • the processor 230 converts the acceleration sensor 211, the magnetic field strength sensor 212, the angular velocity sensor 213, the acceleration information of the stylus pen 200, the magnetic field strength information, and the angular velocity information into motion trajectory information of the stylus that the terminal 100 can process, and transmits the information to the terminal. 100.
  • the processor 230 is further configured to control the sampling time and sampling frequency of the sensor unit 210 by the control information. It can be understood that the above control information can also be sent by the terminal 100 to control the sampling time and sampling frequency of the stylus 200 to be synchronized with the touch panel and the sensor of the terminal 100.
  • the memory 240 is configured to store related software and/or modules, such as software and/or modules that perform the replacement of the relevant signature data detected by the sensor unit 210 with information that the processor 140 can process. It is also used to store the data detected by the sensor unit 210. After the sampling is completed, it is sent to the processor 230, so that the processor 230 converts the data detected by the sensor unit 210 into the second signature data that the terminal can process.
  • the stylus 200 also includes a power source 250 that supplies power to the various components.
  • the stylus 200 when the user inputs the handwritten signature on the touch panel 111 of the terminal 100 using the stylus 200, the stylus 200 detects the acceleration of the stylus 200, the magnetic field strength, and the magnetic field strength by the acceleration sensor 211, the magnetic field strength sensor 212, and the angular velocity sensor 213. Information such as magnetic field strength.
  • the stylus pen 200 converts information such as acceleration, magnetic field strength, magnetic field strength, and the like of the stylus pen 200 into motion trajectory information of the stylus pen 200 by the processor 230.
  • the motion trajectory information of the stylus 200 and the pressure information of the stylus pen 200 by the user are the second signature data.
  • the stylus pen 200 also passes the motion trajectory information of the stylus 200 at the same time, the acceleration of the stylus pen 200, the pressure receiving area of the stylus pen 200 subjected to the user's pressure, and/or the pressure shape information and the user's stylus pen 200 by the processor 230.
  • the pressure information is extracted and packaged into a data packet carrying the corresponding time information, and transmitted to the terminal 100 through the communication unit 220.
  • the stylus 200 receives the control information of the sampling time and the sampling frequency transmitted by the terminal 100 through the communication unit 220, and ensures the temporal correspondence between the first signature data and the second signature data.
  • the sampling time of the first contact point of the stylus 200 and the touch panel 111 of the terminal is 0 ms
  • the terminal 100 controls the stylus 200 and the terminal 100 by transmitting the control information so that the sampling time of the stylus 200 at this time is also 0 ms.
  • the sampling frequency is 0.2ms/time.
  • the signature template data is added, and the sampling time and sampling frequency of the stylus and the terminal are controlled to be synchronized.
  • the stylus signature In the process of the user using the stylus signature, more stylus is extracted through the stylus.
  • User signature feature data, contrast matching makes the attacker imitate the user's handwriting, but also imitate the user's hand movements, increasing the difficulty of the attacker to imitate the signature data, greatly improving the security of the signature authentication system.
  • FIG. 4 the coordinate system and the signature of the signature authentication system provided by the embodiment of the present invention are shown in FIG. 4 .
  • the user hand writes a pen to input a handwritten signature on the touch panel.
  • the position at which the stylus contacts the touch panel can be referred to as a contact point.
  • the touch panel detects the orientation of the contact point and displays the contact point through a display panel integrated with the touch panel. For example, the display panel is originally displayed in white, and after the contact point is detected, the contact point is displayed in black.
  • the user drives the stylus to move on the touch panel, and all contact points of the stylus and the touch panel constitute a signature image of the user.
  • "Xiaowang" is the user's handwritten signature image.
  • the stylus pen point can be set as the first signature feature point
  • the stylus The point corresponding to the pen is set as the second signature feature point.
  • the touch panel converts the touched orientation of the detected contact point into coordinate information of the contact point.
  • the touch panel is integrated with a pressure sensor for detecting pressure information of the stylus received at the contact point.
  • the stylus integrates the relevant sensors to detect the trajectory information of the stylus and the pressure information of the user on the stylus. For example, the stylus obtains the motion track information of the stylus through the acceleration sensor, the magnetic field strength sensor, and the angular velocity sensor, and detects the pressure information of the user on the stylus through the pressure sensor.
  • the coordinate information of the touch point detected by the touch panel and the pressure sensor integrated thereon and the pressure information of the stylus on the touch panel can be set as the first signature data, and the trajectory information of the stylus detected by the stylus through the relevant sensor can be set.
  • the pressure information of the stylus with the user is set as the second signature data.
  • the data corresponding to the first signature feature point may include: coordinate information of the contact point, pressure information of the stylus on the touch panel at the contact point, coordinate information of the stylus pen end, and pressure information of the user on the stylus. It can be understood that, if in the same coordinate system, the coordinate information of the contact point and the coordinate information of the stylus pen end are the same, and one of them can be taken.
  • the data corresponding to the second signature feature point may include: coordinate information of the stylus pen end and pressure information of the user on the stylus. Specifically, when the stylus is lifted, the touch panel and the pressure sensor integrated thereon detect no relevant information of the contact point. That is, assuming that the stylus is penned during the time period from time T1 to time T2, there is no detected first signature data in the time period.
  • the coordinate system of the touch panel is as shown by o 1 x 1 y 1 z 1 in Figure 4, and the x-axis and y-axis of the coordinate system of the o 1 x 1 y 1 z 1 are in the plane of the touch panel, z The axis is perpendicular to the plane of the touch panel.
  • the coordinate system of the stylus is as shown in Fig. 4.
  • the z-axis of the o 2 x 2 y 2 z 2 coordinate system is the straight line where the stylus is located, and the x-axis and the y-axis are in a plane perpendicular to the stylus.
  • the processor of the terminal can preprocess the coordinate information of the received contact point, and transform the data in the coordinate system o 1 x 1 y 1 z 1 into a new coordinate system, and the new coordinate system needs to be used for the user each time.
  • the input handwritten signature image is referenced.
  • the new coordinate system can be the origin of the user's handwritten signature, and the two centerlines of the signature are the x-axis and the y-axis.
  • the "middle line" of the signature refers to the two symmetry lines of the signature image.
  • the average point of the x coordinate can be obtained by averaging the y coordinates of the contact points of the same x coordinate in the coordinate system of o 1 x 1 y 1 z 1 , according to the average of all the same x coordinates in the contact point. Click to find a midline of the signature image. The other midline passes through the signature center point and is perpendicular to a center line.
  • the signature image input by the user each time is fixed and comparable with respect to the center point and the center line of the image. Therefore, the conversion processing corresponding to the new coordinate system described above is also performed on the data in the signature template.
  • the touch panel detects the coordinates of the contact point in the coordinate system o 1 x 1 y 1 z 1 . It can be understood that the z-axis coordinates of the contact points are all 0 in the touch panel. Therefore, (a1, b1, 0) can be used to indicate the coordinates of the contact point.
  • the stylus detects the trajectory of the stylus in the coordinate system o 2 x 2 y 2 z 2 , and the trajectory of the stylus can be represented by the trajectory of the stylus pen end.
  • the coordinates of the stylus pen end may be (a2, b2, c).
  • the coordinates at the contact point should be the same as the stylus pen end coordinates.
  • the coordinates of the same contact point or its corresponding stylus pen end may be different in the two coordinate systems o 1 x 1 y 1 z 1 and o 2 x 2 y 2 z 2 .
  • the coordinate information in the o 2 x 2 y 2 z 2 coordinate system can be converted into the coordinate system o 1 x 1 y 1 z 1 by coordinate transformation, in particular, the coordinate transformation can use the same contact point or its corresponding stylus
  • the positional relationship between the two coordinate systems is analyzed by the coordinate relationship of the pen end in the two coordinate systems, and coordinate transformation is performed on one of the coordinate systems.
  • the data in the signature feature point may include a plurality of, and the contact point is S1 as an example.
  • S1 may be the first contact point of the stylus and the touch panel.
  • the signature feature data E corresponding to S1 includes: coordinates of the contact point (a1, b1, 0), pressure of the stylus on the touch panel P1, coordinates of the stylus (a2, b2, c), pressure of the user on the stylus P2 .
  • the signature feature point S1 corresponds to the signature feature data e included in the signature template book: coordinates of the contact point (m1, n1, 0), stylus-to-touch surface The pressure D1 of the board, the coordinates of the stylus (m2, n2, q), and the pressure D2 of the user on the stylus.
  • the matching ratio of the data E and the data e includes (a1, b1, 0) and (m1, n1, 0), P1 and D1, (a2, b2, c) and (m2, n2, q), P2 and D2.
  • the matching rate of the coordinates of the two points can be obtained by the matching ratio of the values of the two coordinates from the origin distance, or can be obtained by weighting and averaging the matching ratio of the corresponding coordinate values.
  • the data of the signature feature points may include more than one, and the matching rate of all the signature feature points and the signature template data may be averaged or weighted by the matching rate of all signature feature points by the matching rate of the data corresponding to each feature point. Averaged. Among them, the weighted value can be set according to actual needs.
  • the trajectory of the stylus pen end obtained by the stylus and the coordinates of the contact point acquired by the touch panel can be converted into a unified coordinate system, and the trajectory of the converted stylus pen end can be projected.
  • the data of the feature points of the projected motion trajectory is extracted as data of the signature feature points. See the description below for details:
  • the stylus pen end can be in the coordinate system o 2 x 2 y
  • the motion trajectory data in 2 z 2 is correspondingly converted into motion trajectory data in the coordinate system o 1 x 1 y 1 z 1 .
  • the xy plane of the touch panel is the first plane
  • the curve formed by the contact points in the signature image is the first motion trajectory of the stylus pen end in the first plane.
  • the (three-dimensional) motion trajectory of the converted stylus pen is projected on the plane of the touch panel, and the portion of the stylus pen that coincides with the first motion trajectory is removed, and the second trajectory of the stylus pen end in the first plane is obtained.
  • the first signature feature point is a feature point extracted from the first motion trajectory of the stylus.
  • the coordinate information of the first signature feature point may be represented by two-dimensional coordinates in the first plane. It can be understood that if the motion trajectory of the stylus is projected on the first plane, a new second signature feature point can be extracted from the second motion trajectory of the stylus.
  • the new second signature feature point may be a point where the curvature changes greatly in each discontinuous curve corresponding to the second motion trajectory. Therefore, the data corresponding to the new second signature feature point is the two-dimensional coordinate of the point in the first plane and the user pair corresponding to the point.
  • the stylus pen end can be in the coordinate system o 2 x 2
  • the motion trajectory data in y 2 z 2 is correspondingly converted into motion trajectory data in the coordinate system o 1 x 1 y 1 z 1 .
  • the xy plane of the touch panel is the first plane
  • the curve formed by the contact points in the signature image is the first motion trajectory of the stylus pen end in the first plane. It is assumed that the two planes perpendicular to the first plane are the second plane and the third plane.
  • the second plane and the third plane are perpendicular to each other, and the second plane and the third plane share an origin with the first plane and have a total coordinate axis.
  • the (three-dimensional) motion trajectory of the converted stylus pen end is respectively projected on the first plane, the second plane, and the third plane, and the portion overlapping with the first motion trajectory after the projection is removed, and the stylus pen end is obtained in three planes. Two motion trajectories.
  • the first signature feature point is a feature point extracted from the first motion trajectory of the stylus.
  • the coordinate information of the first signature feature point may be represented by two-dimensional coordinates in the first plane.
  • the data corresponding to the first signature feature point includes: coordinates (m1, n1) of the contact point in the first plane, pressure D1 of the stylus on the touch panel, and pressure D2 of the user on the stylus. It may also include data such as the acceleration d1 of the stylus pen end, the pressure receiving area S1 of the stylus pen, and the distance T1 of the stylus pen pressure receiving area from the stylus pen end.
  • a new second signature feature point can be extracted from the second motion trajectory of the stylus.
  • the new second signature feature point may be a point where the curvature changes greatly in each discontinuous curve corresponding to the second motion trajectory. Therefore, the data corresponding to the new second signature feature point is the two-dimensional coordinate of the point in the first plane, the two-dimensional coordinate in the second plane or the two-dimensional coordinate in the third plane, and the user-to-handwritten stylus corresponding to the point.
  • the data corresponding to the new second signature feature point includes: the coordinate of the feature point in the first plane (m2, n2) or the coordinate of the feature point in the second plane (m3, q1) or the feature point is in the second The coordinates of the plane (n3, q2), the pressure D2 of the stylus on the touch panel, and the pressure D4 of the user on the stylus. It may also include data such as the acceleration d2 of the stylus pen end, the pressed area S2 of the stylus pen, and the distance T2 from the stylus pen end of the stylus pen pressure area. Wherein, the feature data of the projection points in different planes can be separately extracted and compared.
  • the signature template data is pre-stored, the detected signature template data pre-entered by the user is also correspondingly transformed, and the corresponding signature is filed. Feature points and signature feature data are saved as signature template data.
  • the embodiment of the invention can also transform the two coordinate systems of the touch panel of the stylus and the terminal, and project the motion track of the stylus on the plane where the touch panel is located, thereby avoiding the possibility of being in the original two coordinate systems.
  • the motion trajectory of the stylus is projected on two planes perpendicular to the plane of the touch panel, and the three-dimensional coordinate comparison is simplified into a two-dimensional coordinate comparison manner, which simplifies the complexity of matching and matching the signature data.
  • FIG. 4 is only a more intuitive form of the signature authentication system, and is not intended to limit the implementation of the embodiments of the present invention. .
  • FIG. 5 is a signaling interaction diagram of a signature authentication method according to an embodiment of the present invention. As shown in FIG. 5, the embodiment specifically includes the following steps:
  • step S101 the touch panel of the terminal detects the handwritten signature input by the user through the stylus.
  • Step S102 The terminal sends control information to the stylus to control the sampling time and the sampling frequency of the stylus to be synchronized with the terminal.
  • the terminal transmits control information to the stylus through the communication unit 1.
  • the sampling time of the terminal and the stylus is synchronized with the sampling frequency to make the attacker While imitating the user's handwriting, it also imitates the user's hand movements, increasing the difficulty of the attacker to imitate the signature data, and greatly improving the security of the signature authentication system.
  • the user handwriting herein refers to image information signed by the user. Specifically, the handwriting may refer to coordinate information of each point in the signature image. In addition, the handwriting may also include pressure information of the stylus on the touch panel at each point in the signature image. Wherein each point in the signature image corresponds to a contact point of the stylus and the touch panel.
  • the user's hand motion here refers to the motion track information when the user drives the stylus in the process of inputting the signature by using the stylus.
  • the hand motion may further include pressure information of the user on the stylus, pressure receiving area of the stylus subject to the user's pressure, shape information of the pressure receiving area, distance information of the pressure receiving area from the stylus pen end, and the like.
  • the handwriting of the user and the hand movement of the user represent the feature information in the process of inputting the signature of the user. According to the feature information listed above, the authentication result of the user inputting the signature is determined, and the security of the signature authentication system can be improved. And reliability.
  • Step S103a the touch panel collects coordinate information of a contact point of the stylus and the touch panel, and the pressure sensor collects pressure information of the stylus on the touch panel at the contact point.
  • the contact point of the stylus and the touch panel constitutes a signature image.
  • Step S103b the sensor unit of the stylus captures the motion track information of the stylus and the pressure information of the user on the stylus.
  • the acceleration sensor, the magnetic field strength, the magnetic field strength and the like can be detected by an acceleration sensor, a magnetic field strength sensor, and an angular velocity sensor. Pressure information on the stylus by the user of the pressure sensor.
  • sensors may be heard to detect the pressure-receiving area of the stylus subjected to the user's pressure and the shape information of the pressed area, and the distance information of the pressed area from the stylus end.
  • Other sensors herein may also include pressure sensors and the like.
  • step S104a the processor of the terminal converts the data collected in step S103a into the first signature data.
  • the processor of the terminal compares the data detected by the touch panel and the pressure sensor by the collection time. It should be the coordinate information corresponding to one contact point and the pressure information of the stylus on the touch panel at the contact point.
  • step S104b the processor of the stylus converts the data collected in step S103b into the second signature data.
  • the processor of the stylus converts information such as acceleration, magnetic field strength, and magnetic field strength of the stylus into motion trajectory information of the stylus.
  • the processor of the stylus corresponds the movement track information of the stylus and the pressure information of the user to the stylus according to the collection time, that is, the coordinate information corresponding to one stylus at one acquisition time and the pressure of the user on the stylus at the collection time. information.
  • step S103b further includes other information
  • the corresponding data in each of the above acquisition times is correspondingly increased.
  • step S105 the stylus sends the second signature data to the terminal.
  • the stylus transmits the second signature data to the terminal through the communication unit 2.
  • Step S106 The processor of the terminal obtains data of the first signature feature point and data of the second signature feature point according to the first signature data and the second signature data.
  • the signature corresponds to the first signature feature point and the second signature feature point.
  • the first signature feature point includes at least one of the set of contact points
  • the second signature feature point includes at least one of a set of points in the motion trajectory of the area of the stylus outside the touch panel.
  • the data corresponding to the first signature feature point includes: coordinate information of the contact point corresponding to the first signature feature point, pressure information of the stylus on the touch panel at the contact point corresponding to the first signature feature point, and the relationship with the first signature feature point
  • the position information of the stylus and the pressure information of the user on the stylus when the sampling time is the same; wherein the position information of the stylus is obtained by the trajectory information of the stylus.
  • the data corresponding to the second signature feature point includes: location information of the stylus corresponding to the second signature feature point and pressure information of the user on the stylus.
  • the data corresponding to the second signature feature point further includes: the stylus detection is performed when the user enters the touch panel through the stylus pen When the line is signed, the stylus is subjected to the pressure area information of the user pressure and the shape information of the pressed area, and the distance information of the stylus pressure area from the stylus pen end.
  • the first signature feature point specifically includes: one or more of the first contact point, the last contact point, the discontinuous contact point, or the contact point having a large curvature change.
  • the second signature feature point specifically includes one or more of the following points: a point having the highest curvature among the curves corresponding to the motion track of each of the discontinuous styluses in the area other than the touch panel, or outside the touch panel
  • the point in the curve corresponding to the motion track of each segment of the discontinuous stylus in the region is the farthest distance from the touch panel.
  • a unified coordinate system transformation can be performed on the motion track of the stylus pen end and the coordinates of the contact points acquired by the touch panel, and the motion track of the converted stylus pen end is projected.
  • the feature points of the projected motion trajectory and the data of the signature feature points are extracted as data of the new signature feature points.
  • Step S107 The processor of the terminal compares the data of the first signature feature point and the data of the second signature feature point with the pre-stored signature template data to obtain a matching ratio.
  • the signature template data is data related to the pre-entered handwritten signature detected by the terminal and the stylus when the handwritten signature is pre-entered before the user inputs the handwritten signature for authentication.
  • the terminal saves the signature template data in the memory, and calls the signature template data stored in the memory during the process of the user inputting the handwritten signature for authentication.
  • the pre-input handwritten signature refers to the basis for comparison when the user saves some template data before signing the authentication.
  • step S108 the processor of the terminal compares the matching rate with the pre-stored matching rate threshold.
  • the indication display panel displays the prompt information that the user inputs the handwritten signature authentication.
  • the matching rate threshold may be preset by the terminal, and is directly called from the memory when the user inputs the signature authentication.
  • the matching rate threshold can also be adjusted according to the environment in which the terminal is actually located.
  • the terminal The environment in which it is located can be judged by the network to which its communication unit 1 is connected. According to the environment in which it is located, determine the security level of the environment in which the terminal is located, and call the matching rate threshold under the security level from the memory.
  • the memory of the terminal stores a list of environments corresponding to different networks, a list of security levels corresponding to different environments, and a list of matching rate thresholds corresponding to different security levels. Further, a list of matching rate thresholds corresponding to different networks or environments can be directly stored. Users can call their corresponding match rate thresholds directly through the network or environment.
  • the user In the process of the user inputting the handwritten signature on the touch panel of the terminal by using the stylus, the user extracts more user signature feature data through the stylus, and compares and matches, so that the attacker imitates the user's handwriting while simulating the user.
  • the hand movements increase the difficulty of the attacker to imitate the user's signature information, greatly improving the security of the signature authentication system.
  • the embodiment of the invention can also set different matching rate thresholds according to the environment of the terminal, and has a good application prospect.
  • the embodiment of the present invention provides that the user can pre-store multiple signature templates in advance, which can reduce the authentication failure rate caused by human factors, and make the user input signature more flexible.
  • the embodiment of the invention can also transform the two coordinate systems of the touch panel of the stylus and the terminal, and project the motion track of the stylus on the plane where the touch panel is located, thereby avoiding the possibility of being in the original two coordinate systems.
  • the motion trajectory of the stylus is projected on two planes perpendicular to the plane of the touch panel, and the three-dimensional coordinate comparison is simplified into a two-dimensional coordinate comparison manner, which simplifies the complexity of matching and matching the signature data.

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Abstract

本发明实施例涉及一种签名认证方法、终端、手写笔及系统。该方法包括当用户通过手写笔在终端的触摸面板上进行签名时，终端检测第一签名数据，第一签名数据包括手写笔与触摸面板的接触点的坐标信息和接触点处手写笔对触摸面板的压力信息；以及，终端接收手写笔发送的第二签名数据，第二签名数据包括手写笔检测的当用户通过手写笔在触摸面板上进行签名时手写笔的运动轨迹信息及用户对手写笔的压力信息。将第一签名数据和第二签名数据与预存的签名模板数据匹配对比，得到匹配率。当匹配率不低于预设的匹配率阈值时，签名认证通过。本发明实施例通过手写笔提取更多用户签名特征数据，增加攻击者模仿用户签名信息的难度，提高了签名认证系统的安全性。

Description

签名认证方法、终端、手写笔及系统 技术领域
本发明涉及手写笔签名认证技术领域，尤其涉及一种签名认证方法、终端、手写笔及系统。
背景技术
手写笔签名技术已成为网络系统虚拟环境中确认用户身份的重要技术。用户使用手写笔在终端的触摸面板输入手写签名进行认证，终端通过触摸面板及传感器检测手写签名的相关数据。终端将其检测的签名的相关数据和预存的签名模板数据对比匹配，以鉴别签名真伪，判断用户输入手写签名认证是否通过。其中，终端检测的签名的相关数据包括签名图像信息和手写笔对触摸面板的压力信息等信息
现有技术中，当尝试模仿用户的手写签名的攻击者得到用户的签名模板数据后，将其依次呈现给终端认证系统，伪造用户的手写签名，通过签名认证。攻击者伪造用户手写签名认证通过后，可非法获取用户的相关权限，进一步威胁用户的人身或财产安全。
现有技术仅终端检测手写签名的相关数据做为签名模板，可模仿性高，故现有手写签名认证系统的安全性差。
发明内容
本发明实施例涉及一种签名认证方法、终端、手写笔及系统，提高手写签名认证系统的安全性。
第一方面，本发明实施例提供了一种签名认证方法，该方法包括：当用户通过手写笔在终端的触摸面板上进行签名时，终端检测第一签名数据，第 一签名数据包括手写笔与触摸面板的接触点的坐标信息和接触点处手写笔对触摸面板的压力信息；以及，终端接收手写笔发送的第二签名数据，第二签名数据包括手写笔检测的当用户通过手写笔在触摸面板上进行签名时手写笔的运动轨迹信息及用户对手写笔的压力信息。将第一签名数据和第二签名数据与预存的签名模板数据匹配对比，得到匹配率。当匹配率不低于预设的匹配率阈值时，签名认证通过。
本发明实施例在用户使用手写笔在终端的触摸面板输入手写签名的过程中，通过手写笔提取更多的用户签名特征数据，对比匹配，增加攻击者模仿用户签名信息的难度，提高了签名认证系统的安全性。
在一种可能的实施方式中，第一签名数据与第二签名数据的采样时间和采样频率保持同步。
本发明实施例提供的签名认证系统，使得攻击者在模仿用户笔迹的同时，还要模仿用户的手部动作，极大幅度提高了签名认证系统的安全性。
在一种可能的实施方式中，签名对应第一签名特征点和第二签名特征点，第一签名特征点包括接触点组成的集合中的至少一个点，第二签名特征点包括手写笔在触摸面板以外区域的运动轨迹中的点的集合中的至少一个点；从第一签名数据和第二签名数据中提取第一签名特征点和第二签名特征点对应的数据；将第一签名特征点和第二签名特征点对应的数据与签名模板数据中每个特征点的数据匹配对比，得到匹配率。
在一种可能的实施方式中，第一签名特征点对应的数据包括：第一签名特征点对应的接触点的坐标信息、第一签名特征点对应的接触点处手写笔对触摸面板的压力信息以及在与第一签名特征点的采样时间相同时手写笔的位置信息和用户对手写笔的压力信息；其中，手写笔的位置信息通过手写笔的运动轨迹信息得到。
其中，当检测手写笔运动轨迹的坐标系与检测接触点的坐标的坐标系变换统一后，触摸面板所在区域内手写笔笔端的位置坐标与接触点的位置坐标 重合。
在一种可能的实施方式中，第二签名特征点对应的数据包括：第二签名特征点对应的手写笔的位置信息及用户对手写笔的压力信息。
在一种可能的实施方式中，第二签名数据还包括：手写笔检测的当用户通过手写笔在触摸面板上进行签名时手写笔的加速度、手写笔受到用户压力的受压面积信息和受压区域的形状信息、以及手写笔受压区域距手写笔笔端的距离信息。
在一种可能的实施方式中，第一签名特征点具体包括下述点中的一个或多个、第一个接触点、最后一个接触点、不连续的接触点或曲率变化大的接触点。
具体地，不连续的接触点对应签名中，不同笔画的起始点。曲率变换大的点对应笔画中的弯折点。
在一种可能的实施方式中，第二签名特征点具体包括下述点中的一个或多个：在触摸面板以外区域中每段不连续的手写笔的运动轨迹对应的曲线中曲率最大的点，或在触摸面板以外区域中每段不连续的手写笔的运动轨迹对应的曲线中距离触摸面板距离最远的点。
其中，每段不连续的手写笔的运动轨迹对应的曲线中曲率最大的点，或每段不连续的手写笔的运动轨迹对应的曲线中距离触摸面板距离最远的点对应两个笔画之间手写笔提笔的最高点。
在一种可能的实施方式中，从接触点中提取第一签名特征点；将手写笔笔端的运动轨迹在触摸面板所在第一平面进行投影，得到手写笔笔端的第一运动轨迹；将手写笔笔端的运动轨迹在与第一平面垂直的第二平面、第三平面进行投影，得到手写笔笔端的第二运动轨迹和第三运动轨迹，第二平面与第三平面垂直；从第一运动轨迹、第二运动轨迹和第三运动轨迹中的至少一个运动轨迹中提取第二签名特征点；从第一签名数据和第二签名数据中提取第一签名特征点和第二签名特征点对应的数据；将第一签名特征点和第二签 名特征点对应的数据与签名模板数据中每个特征点的数据匹配对比，得到匹配率。
在一种可能的实施方式中，根据终端所在的环境预设匹配率阈值。
本发明实施例还可根据终端所在环境，设定不同的匹配率阈值，可适应用户实际需求，具有很好的应用前景。
第二方面，本发明实施例提供了一种签名认证方法，该方法包括：当用户通过手写笔在终端的触摸面板上进行签名时，手写笔检测第二签名数据，第二签名数据包括手写笔的运动轨迹信息及用户对手写笔的压力信息；手写笔将第二签名数据发送给终端，以使终端根据第二签名数据及终端检测的第一签名数据确定签名认证是否通过，第一签名数据包括手写笔与触摸面板的接触点的坐标信息和接触点处手写笔对触摸面板的压力信息。
在一种可能的实施方式中，第二签名数据还包括：手写笔检测的当用户通过手写笔在触摸面板上进行签名时手写笔的加速度、手写笔受到用户压力的受压面积信息和受压区域的形状信息、以及手写笔受压区域距手写笔笔端的距离信息。
具体地，第二签名特征数据反映用户的手部动作特征。不同用户输入手写签名时，手握手写笔的力度、形状、以及握笔区域距笔端的距离可能存在差别。
在一种可能的实施方式中，第一签名数据与第二签名数据的采样时间和采样频率保持同步。
第三方面，本发明实施例提供了一种终端，该终端包括：触摸面板、显示面板、传感器、处理器、存储器、通信单元。
触摸面板，用于接收用户通过手写笔输入的签名。显示面板，用于显示签名的图像。触摸面板，还用于检测手写笔与触摸面板的接触点的坐标信息。 传感器，用于检测接触点处手写笔对触摸面板的压力信息；接触点的坐标信息和接触点处手写笔对触摸面板的压力信息组成第一签名数据。通信单元，用于与手写笔建立通信连接，接收手写笔发送的第二签名数据，第二签名数据包括手写笔检测的当用户通过手写笔在触摸面板上进行签名时手写笔的运动轨迹信息及用户对手写笔的压力信息。存储器，用于存储预设的匹配率阈值。处理器，用于将第一签名数据和第二签名数据与预存的签名模板数据匹配对比，得到匹配率；当匹配率不低于预设的匹配率阈值时，指示显示面板显示签名认证通过的提示信息。显示面板，还用于显示签名认证通过的提示信息。
在一种可能的实施方式中，处理器，还用于向手写笔发送对手写笔的采样时间和采样频率的控制信息，以控制第一签名数据与第二签名数据的采样时间和采样频率保持同步。
在一种可能的实施方式中，签名对应第一签名特征点和第二签名特征点，第一签名特征点包括接触点组成的集合中的至少一个点，第二签名特征点包括手写笔在触摸面板以外区域的运动轨迹中的点的集合中的至少一个点；处理器，具体用于从第一签名数据和第二签名数据中提取第一签名特征点和第二签名特征点对应的数据；将第一签名特征点和第二签名特征点对应的数据与签名模板数据中每个特征点的数据匹配对比，得到匹配率。
在一种可能的实施方式中，处理器，具体用于从接触点中提取第一签名特征点；将手写笔笔端的运动轨迹在触摸面板所在第一平面进行投影，得到手写笔笔端的第一运动轨迹；将手写笔笔端的运动轨迹在与第一平面垂直的第二平面、第三平面进行投影，得到手写笔笔端的第二运动轨迹和第三运动轨迹，第二平面与第三平面垂直；从第一运动轨迹、第二运动轨迹和第三运动轨迹中的至少一个运动轨迹中提取第二签名特征点；从第一签名数据和第二签名数据中提取第一签名特征点和第二签名特征点对应的数据；将第一签名特征点和第二签名特征点对应的数据与签名模板数据中每个特征点的数据 匹配对比，得到匹配率。
在一种可能的实施方式中，处理器，还用于根据通信单元连接的网络确定终端所在的环境，根据终端所在的环境预设匹配率阈值。
第四方面，本发明实施例提供了一种手写笔，该手写笔包括：传感器单元、处理器、通信单元。
传感器单元，用于当用户通过手写笔在终端的触摸面板上进行签名时，检测手写笔的运动轨迹信息及用户对手写笔的压力信息。
处理器，用于将手写笔的运动轨迹信息及用户对手写笔的压力信息转换成终端能够处理的第二签名数据，并指示通信单元发送给终端。
通信单元，用于与终端建立通信连接，并将第二签名数据发送给终端。
在一种可能的实施方式中，传感器单元，还用于当用户通过手写笔在终端的触摸面板上进行签名时，检测手写笔的加速度、手写笔受到用户压力的受压面积信息和受压区域的形状信息、以及手写笔受压区域距手写笔笔端的距离信息。
在一种可能的实施方式中，其特征在于，通信单元，还用于接收终端发送的对传感器单元的采样时间和采样频率的控制信息，以控制第一签名数据与第二签名数据的采样时间和采样频率保持同步。
第五方面，本发明实施例提供了一种签名认证系统，包括上述第三方面提供的终端和上述第四方面提供的手写笔。
本发明实施例提供的签名认证方法、终端、手写笔及系统，终端和手写笔同时检测签名的相关数据，将签名的相关数据与预存的签名模板数据对比匹配，并根据匹配率确定签名认证是否通过。本发明实施例在用户使用手写笔在终端的触摸面板输入手写签名的过程中，通过手写笔提取更多的用户签名特征数据，对比匹配，使得攻击者在模仿用户笔迹的同时，还要模仿用户的手部动作，增加攻击者模仿用户签名信息的难度，极大幅度提高了签名认 证系统的安全性。
附图说明
图1为本发明实施例提供的签名认证系统架构示意图；
图2为本发明实施提供的终端架构示意图；
图3为本发明实施例提供的手写笔架构示意；
图4为本发明实施例提供的签名认证系统的坐标系及签名示意图；
图5为本发明实施例提供的签名认证系统方法信令交互图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提及的“攻击者”指的是尝试模仿用户输入的手写签名的特征，及模仿用户输入手写签名过程中，用户的手部动作等的相关特征，以通过终端的认证的其他用户。本发明实施例提及的“其他用户”指的是相对输入手写签名A的用户A而言的，“其他用户”不同于输入手写签名A的用户A。其中，每个用户与该用户的手写签名的相关数据一一对应。A指代任意用户。
本发明实施例提及的“接触点”指的是手写笔与触摸面板的接触点。可以理解的是，手写笔与触摸面板的接触点组成手写签名图像。
本发明实施例提及的手写笔的“运动轨迹”指的是手写笔上某一点在空间不同位置上对应的点组成的曲线。例如，手写笔笔端在空间划过的不同点组成的曲线为手写笔笔端的运动轨迹。
本发明实施例提及的用户的“握笔姿势”指的是用户握笔时，手写笔受到压力的受压面积和/或受压形状。本发明实施例提及的用户的“握笔力度”指的是用户握笔时，对手写笔的压力信息。需要说明的是，不同用户可能对应不同握笔姿势和握笔力度等特征信息。
本发明实施例提及的“曲率”指的曲线在某一点的弯曲程度的数值。曲率越大，表示曲线的弯曲程度越大。“曲率变化较大的点”指的是曲率弯折变换较明显的点。例如对签名中的具体字而言，笔画“竖钩(乚)”存在两个曲率变化较大的点。笔画“横线-”不存在曲率变化较大的点。
本发明实施例提及的“匹配率”指的是数据与数据对比后的匹配度。
本发明实施例提及的“匹配率阈值”指的是在用户输入手写签名进行认证时，终端可预先设定的一个匹配率门限(匹配率阈值)。用户输入手写签名进行认证时，当手写签名的相关数据与签名模板数据的匹配率不低于该匹配率阈值时，终端可确定该用户的手写签名认证通过。例如，匹配率阈值为70％，终端计算的用户的手写签名的相关数据与签名模板数据的匹配率为75％时，由于75％>70％，则终端确定用户的手写签名认证通过。
本发明实施例提及的“预设”指的是预先设定。“预设匹配率阈值”指的是在用户输入手写签名进行认证之前，预先设定一个匹配率阈值，以判断认证是否通过。
本发明实施例提及的“第一签名数据”指的是终端检测的签名的相关数据，例如签名的图像信息、手写笔对终端的触摸面板的压力信息等。
本发明实施例提及的“第二签名数据”指的是手写笔检测的签名的相关数据，例如用户通过手写笔输入手写签名过程中，用户对手写笔的压力信息和手写笔的运动轨迹信息等。
本发明实施例提及的“时间关系”指的是“第一签名数据”和“第二签名数据”的检测时间关系。例如，当触摸面板和手写笔的采样时间和采样频率保持同步时，相同采样时间对应的第一签名数据和第二签名数据是对应的。
本发明实施例提及的“空间关系”指的是“第一签名数据”和“第二签名数据”对应的点的空间位置关系。可以理解的是，当手写笔笔端与触摸面板接触时，在同一个坐标系中，手写笔笔端所在的位置与接触点所在的位置相同。
本发明实施例提及的“特征点”指的是用户手写签名图像中，有代表性的点。以用户的手写签名为其中文姓名为例，用户的姓氏和名字均是由笔画组成的。不同的笔画可能是不连续的。每个用户写字的习惯和写字大小不同。但签名中每个“字”的笔画是固定不变。因此，可以选取用户手写签名的各个笔画的起始点，做为用户手写签名的特征点。其中，各个笔画的起始点体现为触摸面板检测的不连续的接触点。
进一步，本发明实施例提及的“签名特征点”指的是从第一签名数据对应的特征点和第二签名数据对应的特征点中提取出的部分具有代表性的特征点。其中，手写笔与触摸面板接触的点为第一特征点，手写笔在触摸面板以外区域的点为第二特征点。例如，“签名特征点”包括手写笔与触摸面板的第一个接触点、最后一个接触点、不连续的接触点、曲率变化较大的接触点等接触点中的一个或多个。“签名特征点”还包括两个不连续的接触点对应的手写笔运动轨迹中手写笔距离触摸面板最远的点。
本领域技术人员可以理解的是，手写笔每次提笔期间，手写笔距离触摸面板最远的距离，一定程度上可以反映不同用户的书写习惯。例如，用户输入手写签名过程中，输入不连续的笔画时需要抬起手写笔离开触摸面板运动，其中，书写两个笔画之间，不同用户带动的手写笔离开触摸面板的最远点的距离是不同的。
本发明实施例提及的“安全等级”指的是签名认证系统所在环境的安全情况。例如，在家里或者车内等环境，进行签名认证，对用户而言相对比较安全。在一个更具体的例子中，用户需要在其个人电脑的触摸面板输入手写签名，以开启使用权限。当用户手持个人电脑在家里或者其车内时，相比其 他公共地方，家里或者其车内环境不容易被攻击者侵占，故安全等级相对较高。具体地，可通过“第一”、“第二”、“第三”等区分签名认证系统所在不同环境的安全等级。其中，“第一”可设为最高安全等级，依次降低等级。如家里或车内为“第一安全等级等级”，办公室为“第二安全等级”，户外为“第三安全等级”。
进一步地，在相对较安全的环境中，攻击者侵占的可能性低，则可设置相对较低的匹配率阈值，以更好的适应用户的需求。具体地，可根据不同的安全等级，预设不同的匹配率阈值。如第一安全等级时，匹配率阈值预设为60％。第二安全等级时，匹配率阈值预设为70％。第三安全等级时，匹配率阈值预设为80％。可以理解的是，具体安全等级的划分方式和匹配率阈值的设定，可根据需要做调整，在此不做赘述。
此外，在本申请的描述中，除非另有说明，“第一”、“第二”、“第三”等仅用于区分不同的数据、签名特征点或者安全等级，不应理解为是对数据、签名特征点或者安全等级的具体限定。
图1为本发明实施例提供的签名认证系统架构示意图。如图1所示，包括：终端100和手写笔200。其中，终端100包括触摸面板。用户使用手写笔200在终端100的触摸面板输入手写签名，终端100检测签名图像信息及手写笔200对终端100的压力信息等手写签名的相关数据；同时，手写笔200检测手写笔200的运动轨迹信息及用户对手写笔200的压力信息等手写签名的相关数据，并发送给终端100。终端100将上述终端100和手写笔200检测用户输入的手写签名的相关数据与签名模板数据的匹配率，当匹配率不低于预设的匹配率阈值时，终端100确认用户输入的手写签名认证通过。
在一个示例中，用户输入的手写签名认证通过后，终端100可能会允许用户继续访问终端100相应功能的相关权限。
如上，用户输入的手写签名的相关数据可包括：终端100检测的签名的图像信息、手写笔200与触摸面板的接触点的压力信息。以及手写笔200检 测的用户输入手写签名过程中用户对书写笔200的压力信息和手写笔200的运动轨迹信息。
其中，为简化说明，将终端100检测手写签名的相关数据归类为第一签名数据。将手写笔200检测手写签名的相关数据归类为第二签名数据。手写笔200通过通信链路300将其检测的第二签名数据发送给终端100。
本发明实施例提供的签名认证系统，用户使用手写笔输入手写签名时，终端检测第一签名数据，同时，手写笔检测第二签名数据并发送给终端。终端根据第一签名数据和第二签名数据以及预存的签名模板数据，判断用户输入的手写签名是否认证通过。
可以理解的是，用户在进行签名认证前，用户预输入手写签名做为对比匹配的模板。签名模板数据为用户预输入手写签名时，终端100和手写笔200检测的手写签名的相关数据。终端100将签名模板数据保存在存储器中，在用户输入手写签名进行认证过程中，调用存储器中存储的签名模板数据。
具体地，终端100将终端100和手写笔200检测的手写签名的相关数据与签名模板数据对比匹配时，终端100的处理器可对手写签名的相关数据进行特征点数据提取，以方便比对。可以理解的是，签名模板数据同样对应相关签名特征点的数据。
可以理解的是，用户每次输入手写签名的速度可能会不同。如用户上一次输入手写签名用时1S，下一次输入手写签名可能会用时0.8S。但每个用户的手写签名存在其可对比属性，例如用户的不同次签名对应的签名图像相似。故通过特征点的数据，对手写签名进行比对。
在一个示例中，终端100的处理器可提取第一个接触点、最后一个接触点、不连续的接触点、曲率变化较大的接触点等做为第一签名特征点。提取该签名特征点对应的接触点坐标、手写笔对触摸面板的压力、手写笔的坐标、用户对手写笔的压力等数据做为第一签名特征点的数据。此外，终端100的处理器还可将手写笔在触摸面板以外区域时所在的点也做为签名特征点。例 如，终端100提取在两个不连续接触点对应的采样时间间隔内手写笔距离触摸面板距离最远的点做为第二签名特征点。提取该签名特征点对应的手写笔的坐标、用户对手写笔的压力等数据做为第二签名特征点的数据。
用户通过书写笔200在终端100的触摸面板输入手写签名，终端100通过显示面板显示签名图像。另外，当终端100确定用户输入的手写签名认证通过时，指示显示面板显示认证通过的提示信息。
如图1所示，手写笔200与终端100可通过通信链路300实现信息交互。其中，这里的通信链路300可以为WiFi网络、USB接口、蓝牙连接或红外连接等中的一种或多种。
需要说明的是，手写笔200与终端100的信息交互。包括：手写笔200通过通信链路300向终端100发送其检测的手写签名的相关数据，和/或终端100通过通信链路300向手写笔200发送对手写笔200的采样时间和采样频率的控制信息。
具体地，触摸面板可检测手写笔200与触摸面板的接触点的坐标信息。可通过在触摸面板上集成压力传感器，检测接触点处手写笔200对触摸面板的压力信息。
具体地，手写笔200可通过集成加速度传感器、磁场强度传感器及角速度传感器等检测手写笔200的运动轨迹信息。手写笔200可通过压力传感器检测用户对手写笔200的压力信息。
可以理解的是，预设的匹配率阈值可根据实际需要做调整。其中，可以根据安全等级设定匹配率阈值。也可以直接设定匹配率阈值。在一个可能的示例中，终端100可通过检测其连接的网络，确定终端100所的在环境。进一步确定对应的安全等级和匹配率阈值。
可以理解的是，手写笔检测的用户对手写笔的压力信息反映用户的握笔力度。用户输入的手写签名的相关数据还可包括：手写笔200检测的手写笔受到用户压力的受压面积和/或受压形状信息。其中，手写笔受到用户压力的 受压面积和/或受压形状反映用户握笔(手写笔)的姿势。例如，用户g1习惯采用大拇指和食指握笔，通过预先保存用户g1使用大拇指和食指握笔时对手写笔的压力信息、以及手写笔的受压面积和/或受压形状，以在用户g1再次输入手写签名进行认证时，对比与预存的用户g1的握笔力度和握笔姿势是否匹配。
具体地，用户的握笔姿势可参照上述用户握笔力度的检测方式，通过压力传感器或者结合使用触摸传感器得到。
可以理解的是，用户输入的手写签名的相关数据还可包括：手写笔200检测的手写笔运动的加速度。例如，手写笔笔端的加速度。
具体地，手写笔笔端的加速度可通过上述加速度传感器得到。也可通过手写笔的运动轨迹计算得到。
可以理解的是，用户输入的手写签名的相关数据还可包括：手写笔200受压区域距手写笔笔端的距离信息。其中，手写笔受压区域距手写笔笔端的距离反映不同用户的握笔习惯。例如，有的用户喜欢握笔的中部，进行书写。有的用户喜欢握笔的上端，进行书写等。
在本发明实施例的其他实施方式中，可由其他用户向终端100输入其所在环境的安全等级或匹配率阈值。在一个具体的应用场景中，例如，用户C在银行办理相关业务时，需要输入手写签名进行身份认证，此时其他用户为银行工作人员D，银行工作人员D可根据实际需要，向终端100输入用户C的进行手写签名认证时的匹配率阈值。
在本发明的其他实施方式中，手写笔200可以集成在终端100上，例如终端100设置插槽，手写笔200可插入终端100，用户进行签名时，拔出手写笔100并使用。为简化说明，本发明实施例仅以手写笔200与终端100分开为例进行说明。
在本发明的其他实施方式中，终端100可以为带触摸屏的智能手机、带触摸屏的终端。另外，触摸屏/触摸面板可以与终端拆分开，触摸屏单独一体， 此时，触摸屏也可以称做手写板。该签名认证系统将包括触摸屏(手写板)、终端和手写笔。其中，触摸屏用于接收用户的手写签名并检测签名图像的信息，触摸屏上集成压力传感器以检测手写笔的压力信息。触摸屏记录手写签名的相关数据，并发送给终端。本发明实施例仅以触摸屏和终端集成一体为例进行说明。
本发明实施例检测的签名数据包括终端检测的签名的图像信息和手写笔对终端的压力信息，以及手写笔检测的用户使用手写笔输入签名时手写笔的运动轨迹信息和用户对手写笔的压力信息。本发明实施例提供的签名认证系统，在用户使用手写笔签名的过程中，同时通过手写笔提取更多的用户签名特征数据，对比匹配，使得攻击者在模仿用户笔迹的同时，还要模仿用户的手部动作，增加攻击者模仿签名数据的难度，极大幅度提高了签名认证系统的安全性。
相应地，本发明实施例还提供一种终端，用于实现前述实施例中提供的系统。如图2所示，所述终端包括：显示屏110、传感器120、I/O子系统130、处理器140、存储器150、通信单元160以及电源170等部件。下面结合图2对终端100的各个构成部件进行具体的介绍：
显示屏110，用于接受用户输入手写签名，还用于显示用户输入的手写签名图像或显示用户输入的手写签名认证结果的提示信息以及终端100的各种菜单。具体的显示屏110可包括触摸面板111和显示面板112。
触摸面板111，也称为触摸屏、触敏屏等，可收集用户在其上或附近的接触或者非接触操作。例如，用户使用手写笔(触笔)等任何适合的物体在触摸面板111上或在触摸面板111附近的操作。可选的，触摸面板111可包括触摸检测装置和触摸控制器两个部分。其中，触摸检测装置检测手写笔的触摸方位、姿势，并检测触摸操作带来的信号，将信号传送给触摸控制器。触摸控制器从触摸检测装置上接收触摸信息，并将它转换成处理器140能够处理的信 息。另外，触摸控制器能接收处理器140发来的命令并加以执行。
在一个示例中，触摸控制器将触摸检测装置检测的手写笔与触摸面板111接触点的触摸方位转换成接触点的坐标信息，并将接触点的坐标信息发送给处理器140。
进一步的，触摸面板111可覆盖显示面板112，用户可以根据显示面板112显示的内容，在显示面板112上覆盖的触摸面板111上或者附近进行操作，触摸面板111检测到在其上或附近的操作后，通过I/O子系统130传送给处理器140以确定用户输入，随后处理器140根据用户的输入通过I/O子系统130在显示面板112上提供相应的视觉输出。虽然在图2中，触摸面板111与显示面板112是作为两个独立的部件来实现终端100的输入和输入功能，但是在某些实施例中，可以将触摸面板111与显示面板112集成而实现终端100的输入和输出功能。
I/O子系统130，用来控制输入输出的外部设备，可以包括显示控制器131、传感器控制器132、其他输入设备控制器133。其中，显示控制器131从显示屏110接收信号，和/或向显示屏110发送信号。显示屏110检测到用户输入的手写签名信息后，显示控制器131将检测到的用户输入的手写签名信息转换为与显示在显示屏110上的用户界面对象的交互。例如，显示控制器131将用户输入的手写签名信息转换为显示在显示面板112的手写签名图像，实现人机交互。传感器控制器132可以从一个或者多个传感器120接收信号，和/或者向一个或者多个传感器120发送信号。
终端100还可包括至少一种传感器120，比如压力传感器121以及其他传感器122。具体地，压力传感器121，用于检测终端100受到的压力信息。进一步地，可将压力传感器121集成在显示屏110中，检测手写笔对触摸面板111的压力信息，并通过传感器控制器132发送给处理器140。具体地，将压力传感器121设置在触摸面板111和显示面板112之间，或将压力传感器121覆盖在触摸面板111之上，使压力传感器121检测手写笔对触摸面板111的压力信息。
其中，触摸面板111检测的接触点的坐标信息，以及压力传感器121检测的手写笔对触摸面板111的压力信息，可统一为终端100检测的第一签名数据。
处理器140是终端100的控制中心，利用各种接口和线路连接整个终端的各个部分，通过运行或执行存储在存储器150内的软件程序和/或模块，以及调用存储在存储器150内的数据，执行终端100的各种功能和处理数据，从而对终端100进行整体监控。可选的，处理器140可包括一个或多个处理单元。优选的，处理器140可集成应用处理器和调制解调处理器，其中，应用处理器主要处理操作系统、用户界面和应用程序等，调制解调处理器主要处理无线通信。可以理解的是，上述调制解调处理器也可以不集成到处理器140中。
在一个示例中，用户输入手写签名过程中，显示控制器131和传感器控制器132将检测的第一签名数据发送给应用处理器。同时，手写笔200检测第二签名数据并发送给终端100。调制解调处理器接收的手写笔200发送的第二签名数据，并发送给应用处理器。应用处理器通过运行存储器150内的软件程序及调用存储器150中的签名模板数据，根据手写签名的第一签名数据和第二签名数据判断用户输入的手写签名认证是否通过。应用处理器将第一签名数据和第二签名数据与签名模板数据匹配对比，得到相应的匹配率。当匹配率不低于预设的匹配率阈值时，应用处理器确定签名认证通过，指示显示屏110显示签名认证通过的提示信息。
通信单元160，用于实现终端100与外界网络或者设备的信息交互。可包括无线通信模块和/或通信接口。其中，无线通信模块可用于收发信息过程中，信号的接收和发送，例如，射频电路或者WiFi模块。通信接口可用于与外界设备直接连接，实现终端100与外部设备交互信息。例如，USB接口。此外，通信单元160还可包括红外模块、蓝牙模块等可实现终端100与外界网络或者设备的信息交互的部件，在此不做具体限定。
终端100还包括给各个部件供电的电源170(比如电池)，优选的，电源170可以通过电源管理系统与处理器140逻辑相连，从而通过电源管理系统实 现管理充电、放电、以及功耗等功能。
终端100还可包括其他输入设备180，其他输入设备180与I/O子系统130的其他输入设备控制器133相连接，在其他设备输入控制器133的控制下与处理器140进行信息交互。在此不做赘述。
在一个具体的示例中，用户使用手写笔200在终端100的显示屏110输入手写签名时，触摸面板111的触摸检测装置检测手写笔200与触摸面板111的接触点的方位信号，触摸面板111的触摸控制器将上述接触点的方位信号转换成坐标信息，并通过显示控制器131发送给处理器140。压力传感器121检测上述接触点处手写笔200对触摸面板111的压力信息，并通过传感器控制器132发送给处理器140。可以理解的是，可将上述接触点的坐标信息和接触点的压力信息记为第一签名数据。另外，显示屏110检测到用户输入的手写签名后，显示控制器131将检测到的用户输入的手写签名转换为可显示在显示屏110上的签名图像，以便用户查看。
终端100通过通信单元160接收手写笔200检测的第二签名数据。其中，第二签名数据包括：用户通过手写笔200输入上述手写签名时，手写笔200检测的手写笔的运动轨迹信息、手写笔笔端的加速度、手写笔受到用户压力的受压面积和/或受压形状信息和用户对手写笔200的压力信息等相关信息。处理器140将第一签名数据和第二签名数据与预存在存储器150中的签名模板数据进行对比匹配，计算匹配率。处理器140将上述计算得到的匹配率与预存在存储器150中的匹配率阈值比较，当上述计算得到的匹配率阈值不低于预存的匹配率阈值时，处理器140确定上述用户的手写签名认证通过。处理器140指示显示面板112显示用户手写签名认证通过的提示信息。
具体地，终端100处理器140可通过第一签名数据和第二签名数据提取签名特征点的数据。将提取出的签名特征点的数据与签名模板中对应的该签名特征点的数据匹配对比，计算匹配率。其中，签名特征点包括第一签名特征点和第二签名特征点。签名特征点的数据包括第一签名特征点的数据和第二 签名特征点的数据。具体签名特征点及其数据的提取方法，可参见图4中的详细介绍。
需要说明的是，该用户使用手写笔200输入上述手写签名之前，可以由该该用户或者其他用户向处理器140发送指示该用户的身份信息的指令，处理器140可根据指示用户的身份信息的指令从存储器150中调用该用户的签名模板数据。
具体地，指示该用户的身份信息的指令可以为该用户的身份证号、该用户的工号等信息。其中，存储器150中预存多个用户的签名模板数据，每个用户的签名模板数据携带该用户的身份信息。处理器140收到指示该用户的身份信息的指令后，根据用户的身份信息在存储器150中查询该用户的签名模板数据。其中，每个用户的签名模板数据携带该用户的身份信息。
可以理解的是，考虑用户每次输入的手写签名的固有差异，每个用户的签名模板数据可包括多个。即在用户预输入手写签名时，用户可多次输入手写签名(模板)，终端100和手写笔200检测每次的手写签名(模板)的数据，并一一保存。在用户输入手写签名进行认证的阶段，处理器140将终端100和手写笔200检测的认证阶段的签名数据与该用户的多个签名模板数据一一对比匹配，选取其中最大的匹配率为最终的对比匹配率，根据预设的匹配率阈值，判断用户签名认证是否通过。
可以理解的是，签名模板数据也包括终端100检测的第一签名(模板)数据和手写笔200检测的第二签名(模板)数据。此外，签名模板数据可包括提取完的对应的签名特征点的数据。具体签名特征点及其数据的提取方法，可参见图4中的详细介绍。
相应地，本发明实施例还提供一种手写笔，用于实现前述实施例中提供的系统。如图3所示，所述手写笔包括：传感器单元210、通信单元220、处理器230、存储器240、电源250等部件。下面结合图3对手写笔200的各 个构成部件进行具体的介绍：
传感器单元210，用于检测用户使用手写笔200在终端100的触摸面板111输入手写签名的过程中的相关签名数据。具体地，传感器单元210可以包括加速度传感器211、磁场强度传感器212、角速度传感器213、压力传感器214以及其他传感器215。
在一种可能的实施方式中，加速度传感器211可用于检测手写笔200笔端的加速度、磁场强度传感器212可用于检测手写笔200的磁场强度、角速度传感器213可用于检测手写笔200的角速度。进一步地，可根据手写笔200的加速度、角速度和磁场强度的变化信息，得到手写笔200的运动轨迹信息。压力传感器214可用于检测用户对手写笔200的压力信息。
需要说明的是，其他传感器215可包括以陀螺仪、重力传感器、WiFi定位传感器或红外定位传感器等传感器。其中，上述用于检测手写笔200的运动轨迹信息的加速度传感器211、磁场强度传感器212、角速度传感器213可由其他传感器215中的一个或多个代替。本发明实施例并不具体限定检测手写笔200运动轨迹数据所用到的传感器。可以理解的是，用于检测手写笔运动轨迹的传感器或者仪器，均应属于本发明实施例的保护范围。
传感器单元210还可通过相关传感器检测手写笔受到用户压力的受压面积信息和受压形状信息，以及所述手写笔受压区域距手写笔笔端的距离信息等。这里的相关传感器可以包括触摸传感器。上述信息也可做为第二签名数据中的一种或多种，以反映不同用户的握笔习惯。通过上述特征信息的对比，增加攻击者的模仿难度。
通信单元220，用于与前述通信单元160连接，实现手写笔200与终端100的信息交互。其中，通信单元220也可包括对通信单元160相对应的通信模块和/或通信接口。例如，通信单元160包括WiFi模块1，通信单元220包括相应的WiFi模块2，终端100和手写笔200通过WiFi模块1和WiFi模块2建立通信连接。
处理器230，用于运行或执行存储在存储器240内的软件程序和/或模块，执行将传感器单元210检测的相关签名数据换成终端100能够处理的信息。例如，处理器230将加速度传感器211、磁场强度传感器212、角速度传感器213检测手写笔200的加速度信息、磁场强度信息和角速度信息转换为终端100能够处理的手写笔的运动轨迹信息，并发送给终端100。
此外，处理器230还用于通过控制信息控制传感器单元210的采样时间和采样频率。可以理解的是，上述控制信息也可由终端100发出，以控制手写笔200的采样时间和采样频率与终端100触摸面板和传感器保持同步。
存储器240，用于存储相关软件和/或模块，例如执行将传感器单元210检测的相关签名数据换成处理器140能够处理的信息的软件和/或模块。还用于存储传感器单元210检测的数据，待采样结束后，发送给处理器230，以使处理器230将传感器单元210检测的数据转换成终端可以处理的第二签名数据。
手写笔200还包括给各个部件供电的电源250。
在一个具体的示例中，用户使用手写笔200在终端100的触摸面板111输入手写签名时，手写笔200通过加速度传感器211、磁场强度传感器212、角速度传感器213检测手写笔200的加速度、磁场强度、磁场强度等信息。通过压力传感器214用户对手写笔200的压力信息。
手写笔200通过处理器230将手写笔200的加速度、磁场强度、磁场强度等信息转换为手写笔200的运动轨迹信息。手写笔200的运动轨迹信息和用户对手写笔200的压力信息为第二签名数据。手写笔200还通过处理器230将同一时刻的手写笔200的运动轨迹信息、手写笔200的加速度、手写笔200受到用户压力的受压面积和/或受压形状信息和用户对手写笔200的压力信息提取，打包成一个携带对应时刻信息的数据包，通过通信单元220发送给终端100。
需要说明的是，手写笔200通过通信单元220接收终端100发送的采样时间和采样频率的控制信息，保证第一签名数据与第二签名数据的时时对应性。 例如，手写笔200与终端的触摸面板111的第一个接触点的采样时间为0ms，终端100通过发送控制信息使得手写笔200此时的采样时间也为0ms，控制手写笔200和终端100的采样频率均为0.2ms/次。可以理解的是，在终端100和手写笔200的采样时间和采样频率同步的情况下，对于攻击者而言，模仿用户笔迹和模仿用户手持手写笔对触摸面板的压力的同时，又要模仿用户的手部动作和用户对手写笔的压力等信息，是非常困难的。
因此，通过应用上述签名认证系统、终端及手写笔，增加了签名模板数据，控制手写笔和终端的采样时间和采样频率同步，在用户使用手写笔签名的过程中，通过手写笔提取更多的用户签名特征数据，对比匹配，使得攻击者在模仿用户笔迹的同时，还要模仿用户的手部动作，增加攻击者模仿签名数据的难度，极大幅度提高了签名认证系统的安全性。
相应地，本发明实施例提供的签名认证系统的坐标系及签名示意，可参见图4。
如图4所示，用户手握手写笔在触摸面板输入手写签名。手写笔与触摸面板接触的位置可称为接触点。触摸面板检测接触点的方位，并通过与触摸面板集成一体的显示面板显示该接触点。例如，显示面板原先显示为白色，检测到接触点后，将该接触点显示为黑色。
用户带动手写笔在触摸面板运动，手写笔与触摸面板的所有接触点组成用户的签名图像。如图4中“小王”为用户的手写签名图像。
其中，用户手持手写笔落笔时，与触摸面板有接触点，如图4所示的接触点。在书写不同笔画或者不同字之间，用户会提起手写笔，在触摸面板以外区域将手写笔从上一个接触点移动到下一个与之不连续的接触点。从用户手持手写笔提笔时，手写笔会在触摸面板以外区域划过一段运动轨迹，如图4所示。
因此，可以将手写笔落笔点(接触点)设定为第一签名特征点，手写笔 提笔对应的点(接触点以外的点)设定为第二签名特征点。
在用户输入手写签名的过程中，触摸面板将检测的接触点的触摸方位转换成接触点的坐标信息。触摸面板集成有压力传感器，用于检测接触点处受到的手写笔的压力信息。同时，手写笔集成相关传感器以检测手写笔的运动轨迹信息和用户对手写笔的压力信息。如手写笔通过加速度传感器、磁场强度传感器、角速度传感器得到手写笔的运动轨迹信息，通过压力传感器检测用户对手写笔的压力信息。
因此，可将触摸面板以及其上集成的压力传感器检测的接触点的坐标信息和手写笔对触摸面板的压力信息设为第一签名数据，将手写笔通过相关传感器检测的手写笔的运动轨迹信息和用户对手写笔的压力信息设为第二签名数据。
故，第一签名特征点对应的数据可包括：接触点的坐标信息、接触点处手写笔对触摸面板的压力信息、手写笔笔端的坐标信息及用户对手写笔的压力信息。可以理解的是，若在同一坐标系中，则接触点的坐标信息和手写笔笔端的坐标信息是相同的，可以取其一即可。第二签名特征点对应的数据可包括：手写笔笔端的坐标信息及用户对手写笔的压力信息。具体地，当手写笔提笔时，触摸面板及其上集成的压力传感器检测不到接触点的相关信息。即假设时间T1至时间T2的时间段内，手写笔提笔，则该时间段内无检测的第一签名数据。
在一个可能的示例中，触摸面板的坐标系如图4中o1x1y1z1所示，o1x1y1z1坐标系的x轴、y轴在触摸面板所在平面，z轴与触摸面板所在平面垂直。手写笔的坐标系如图4中示，o2x2y2z2坐标系的z轴为手写笔所在直线，x轴、y轴在与手写笔垂直的平面。
需要说明的是，触摸面板检测接触点时，在o1x1y1z1坐标系中记录坐标信息。但考虑用户每次输入签名位置相对原点可能会存在差别。因此，终端的处理器可以将接收的接触点的坐标信息进行预处理，将坐标系o1x1y1z1中的数 据变换到新的坐标系中，新的坐标系需要对用户每次输入的手写签名图像都具有参考性。例如，新的坐标系可以用户手写签名的中心为原点，签名的两个中分线为x轴和y轴。签名的“中分线”指的是签名图像两个对称线。具体地，可以通过对o1x1y1z1坐标系中对相同x坐标的接触点求y坐标平均值，得到该x坐标下的平均点，根据接触点中所有相同x坐标下的平均点求得签名图像的一条中分线。另一条中分线经过签名中心点并与一条中分线垂直。
可以理解的是，用户每次输入的签名图像，相对图像的中心点和中分线而言，存在固定性，具有可对比性。因此，同样对签名模板中的数据，进行如上述新坐标系对应的变换处理。
触摸面板在坐标系o1x1y1z1中检测接触点的坐标。可以理解的是，触摸面板内，接触点的z轴坐标均为0。故可以使用(a1,b1,0)表示接触点的坐标。手写笔在坐标系o2x2y2z2中检测手写笔的运动轨迹，手写笔的运动轨迹可通过手写笔笔端的运动轨迹表示。其中，手写笔笔端的坐标可以为(a2,b2,c)。
需要说明的是，手写笔落笔时，手写笔笔端与触摸面板有接触点时，若在同一个坐标系中，接触点处的坐标应当和手写笔笔端坐标相同。在实际检测时，同一个接触点或其对应的手写笔笔端在o1x1y1z1和o2x2y2z2两个坐标系中的坐标可能不同。
可通过坐标变换将o2x2y2z2坐标系中的坐标信息转换到坐标系o1x1y1z1中，具体地，坐标变换可使用同一个接触点或其对应的手写笔笔端在两个坐标系中的坐标关系等信息，分析两个坐标系的位置关系，对其中的一个坐标系进行坐标变换。
更进一步，签名特征点中的数据可包括多个，以接触点为S1为例，例如S1可为手写笔与触摸面板的第一个接触点。S1处对应的签名特征数据E包括：接触点的坐标(a1,b1,0)、手写笔对触摸面板的压力P1、手写笔的坐标(a2,b2,c)、用户对手写笔的压力P2。相应的，签名特征点S1对应在签名模板书包括的签名特征数据e为：接触点的坐标(m1,n1,0)、手写笔对触摸面 板的压力D1、手写笔的坐标(m2,n2,q)、用户对手写笔的压力D2。
则数据E与数据e的匹配率包括(a1,b1,0)与(m1,n1,0)、P1与D1、(a2,b2,c)与(m2,n2,q)、P2与D2的四组数据匹配率的平均值或加权平均值。其中，两个点的坐标的匹配率可通过两个坐标距原点距离的数值的匹配率求得，也可以通过对相应坐标数值求匹配率再进行加权求平均得到。
此外，签名特征点的数据可不止包括一个，则所有签名特征点与签名模板数据的匹配率可通过每个特征点对应数据的匹配率，再对所有签名特征点对应的匹配率求平均或者加权平均得到。其中，加权数值可根据实际需要设定。
另外，可将手写笔采集得到的手写笔笔端的运动轨迹和触摸面板采集得到的接触点的坐标，进行统一的坐标系变换，并对变换后的手写笔笔端的运动轨迹做投影。提取投影后的运动轨迹的特征点的数据，作为签名特征点的数据。具体可参见下面的描述：
在一个示例中，在将手写笔的坐标系o2x2y2z2转换为触摸面板的坐标系o1x1y1z1后，可将手写笔笔端在坐标系o2x2y2z2中的运动轨迹数据相应转换成在在坐标系o1x1y1z1中的运动轨迹数据。设在o1x1y1z1坐标系中，触摸面板所在xy平面为第一平面，设签名图像中接触点组成的曲线为手写笔笔端在第一平面的第一运动轨迹。将转换后的手写笔笔端的(三维)运动轨迹在触摸面板所在平面投影，除去投影后与第一运动轨迹重合的部分，得到手写笔笔端在第一平面的第二运动轨迹。
则，上述第一签名特征点为从手写笔第一运动轨迹中提取的特征点。此时，第一签名特征点的坐标信息可采用第一平面中的二维坐标表示。可以理解的是，如果将手写笔的运动轨迹在第一平面进行投影，则可从手写笔的第二运动轨迹中提取新的第二签名特征点。例如，新的第二签名特征点可以为第二运动轨迹对应的每段不连续的曲线中曲率变化较大的点。故，新的第二签名特征点对应的数据为该点在第一平面的二维坐标以及该点对应的用户对 手写笔的压力信息、手写笔笔端的加速度和手写笔受到用户压力的受压面积和受压形状等数据。
可以理解的是，将两个坐标系统一后，第一签名特征点的坐标将与新的第二签名特征点的坐标重合。
在另一个示例中，在将手写笔的坐标系o2x2y2z2转换为触摸面板的坐标系o1x1y1z1后，可将手写笔笔端在坐标系o2x2y2z2中的运动轨迹数据相应转换成在在坐标系o1x1y1z1中的运动轨迹数据。设在o1x1y1z1坐标系中，触摸面板所在xy平面为第一平面，设签名图像中接触点组成的曲线为手写笔笔端在第一平面的第一运动轨迹。设与第一平面垂直的两个平面为第二平面和第三平面。其中，第二平面和第三平面相互垂直，第二平面和第三平面与第一平面共原点且共一个坐标轴。将转换后的手写笔笔端的(三维)运动轨迹在第一平面、第二平面和第三平面分别投影，除去投影后与第一运动轨迹重合的部分，得到手写笔笔端在三个平面的第二运动轨迹。
则，上述第一签名特征点为从手写笔第一运动轨迹中提取的特征点。此时，第一签名特征点的坐标信息可采用第一平面中的二维坐标表示。如，第一签名特征点对应的数据包括：该接触点在第一平面的坐标(m1,n1)、手写笔对触摸面板的压力D1、用户对手写笔的压力D2。还可包括手写笔笔端的加速度d1、手写笔的受压面积S1、手写笔受压区域距手写笔笔端的距离T1等数据。
可以理解的是，如果将手写笔的运动轨迹在三个平面进行投影，则可从手写笔的第二运动轨迹中提取新的第二签名特征点。例如，新的第二签名特征点可以为第二运动轨迹对应的每段不连续的曲线中曲率变化较大的点。故，新的第二签名特征点对应的数据为该点在第一平面的二维坐标、在第二平面的二维坐标或在第三平面的二维坐标以及该点对应的用户对手写笔的压力信息、手写笔笔端的加速度和手写笔受到用户压力的受压面积和受压形状等数据。
如，新的第二签名特征点对应的数据包括：该特征点在第一平面的坐标(m2，n2)或该特征点在第二平面的坐标(m3,q1)或该特征点在第二平面的坐标(n3,q2)、手写笔对触摸面板的压力D2、用户对手写笔的压力D4。还可包括手写笔笔端的加速度d2、手写笔的受压面积S2、手写笔受压区域距手写笔笔端的距离T2等数据。其中，可将不同平面中的投影点的特征数据分别提取对比。
具体地，如采用坐标系统一变换、对手写笔运动轨迹投影的签名认证对比方案，则在预存签名模板数据时，同样对检测的用户预输入的签名模板数据进行相应变换，并提起相应的签名特征点及签名特征数据保存为签名模板数据。
本发明实施例还可对手写笔和终端的触摸面板的两个坐标系进行变换，并将手写笔的运动轨迹在触摸面板所在的平面上进行投影，避免了在原先两个坐标系中，可能会对应的同一特征点在两个坐标系中的坐标数据匹配对比的情况。本发明实施例还将手写笔的运动轨迹在与触摸面板所在平面垂直的两个平面上进行投影，将三维坐标对比简化成二维坐标对比的方式，简化了对签名数据对比匹配的复杂度。需要说明的是，图4仅为签名认证系统的更直观的一种示意形式，并不用作对本发明实施例方案的任何限定。.
下面结合图5，详细说明本发明实施例提供的签名认证方法，图5为本发明实施例提供的一种签名认证方法信令交互图，在本发明实施例中实施主体为终端。如图5所示，该实施例具体包括以下步骤：
步骤S101，终端的触摸面板检测到用户通过手写笔输入的手写签名。
步骤S102，终端向手写笔发送控制信息，以控制手写笔的采样时间与采样频率与终端保持同步。
终端通过通信单元1向手写笔发送控制信息。
终端和手写笔的采样时间与采样频率与终端保持同步，以使得攻击者 在模仿用户笔迹的同时，还要模仿用户的手部动作，增加攻击者模仿签名数据的难度，极大幅度提高了签名认证系统的安全性。
需要说明的是，这里的用户笔迹指的是用户签名的图像信息，具体地，笔迹可指签名图像中每个点的坐标信息。另外，笔迹还可包括签名图像中的每个点处手写笔对触摸面板的压力信息。其中，签名图像中的每个点对应手写笔与触摸面板的一个接触点。
需要说明的是，这里的用户手部动作指的是用户使用手写笔输入签名过程中，用户带动手写笔运动时的运动轨迹信息。另外，手部动作还可包括用户对手写笔的压力信息、手写笔受到用户压力的受压面积和受压区域形状信息、以及受压区域距离手写笔笔端的距离信息等。
可以理解的是，用户的笔迹及用户的手部动作，均代表用户的输入签名过程中的特征信息，根据上述列举的特征信息，确定用户输入签名的认证结果，可以提高签名认证系统的安全性和可靠性。
步骤S103a，触摸面板采集手写笔与触摸面板的接触点的坐标信息，压力传感器采集接触点处手写笔对触摸面板的压力信息。
其中，手写笔与触摸面板的接触点组成签名图像。
步骤S103b，手写笔的传感器单元采集手写笔的运动轨迹信息和用户对手写笔的压力信息。
其中，可通过加速度传感器、磁场强度传感器、角速度传感器检测手写笔的加速度、磁场强度、磁场强度等信息。通过压力传感器用户对手写笔的压力信息。
进一步，还可听过其他传感器检测手写笔受到用户压力的受压面积和受压区域形状信息、以及受压区域距离手写笔笔端的距离信息。这里的其他传感器也可包括压力传感器等。
步骤S104a，终端的处理器将步骤S103a采集的数据转换成第一签名数据。
终端的处理器将触摸面板和压力传感器检测的数据按采集时间一一对 应，即一个采集时间下对应一个接触点坐标信息和该接触点处手写笔对触摸面板的压力信息。
步骤S104b，手写笔的处理器将步骤S103b采集的数据转换成第二签名数据。
手写笔的处理器将手写笔的加速度、磁场强度、磁场强度等信息转换为手写笔的运动轨迹信息。
手写笔的处理器将手写笔的运动轨迹信息和用户对手写笔的压力信息按采集时间一一对应，即一个采集时间下对应一个手写笔的坐标信息和该采集时间处用户对手写笔的压力信息。
此外，在步骤S103b采集的数据还包括其他信息的情况下，相应增加上述每个采集时间下对应的数据。
步骤S105，手写笔将第二签名数据发送给终端。
手写笔通过通信单元2将第二签名数据发送给终端。
步骤S106，终端的处理器根据第一签名数据和第二签名数据得到第一签名特征点的数据和第二签名特征点的数据。
其中，签名对应第一签名特征点和第二签名特征点。第一签名特征点包括接触点组成的集合中的至少一个点，第二签名特征点包括手写笔在触摸面板以外区域的运动轨迹中的点的集合中的至少一个点。
第一签名特征点对应的数据包括：第一签名特征点对应的接触点的坐标信息、第一签名特征点对应的接触点处手写笔对触摸面板的压力信息以及在与第一签名特征点的采样时间相同时手写笔的位置信息和用户对手写笔的压力信息；其中，手写笔的位置信息通过手写笔的轨迹信息得到。
第二签名特征点对应的数据包括：第二签名特征点对应的手写笔的位置信息及用户对手写笔的压力信息。
此外，在步骤S103b采集的数据还包括其他信息的情况下，第二签名特征点对应的数据还包括：手写笔检测的当用户通过手写笔在触摸面板上进 行签名时手写笔受到用户压力的受压面积信息和受压区域的形状信息，以及手写笔受压区域距手写笔笔端的距离信息。
具体地，第一签名特征点具体包括：第一个接触点、最后一个接触点、不连续的接触点或曲率变化大的接触点中的一个或多个点。
具体地，第二签名特征点具体包括下述点中的一个或多个：在触摸面板以外区域中每段不连续的手写笔的运动轨迹对应的曲线中曲率最大的点，或在触摸面板以外区域中每段不连续的手写笔的运动轨迹对应的曲线中距离触摸面板距离最远的点。
此外，还可对手写笔笔端的运动轨迹和触摸面板采集得到的接触点的坐标，进行统一的坐标系变换，并对变换后的手写笔笔端的运动轨迹做投影。提取投影后的运动轨迹的特征点及签名特征点的数据，作为新的签名特征点的数据。具体可参见图4中的描述，在此不做赘述。
步骤S107，终端的处理器将第一签名特征点的数据和第二签名特征点的数据与预存的签名模板数据对比，得到匹配率。
需要说明的是，签名模板数据为用户输入手写签名进行认证之前，预输入手写签名时，终端和手写笔检测的预输入的手写签名的相关数据。终端将签名模板数据保存在存储器中，在用户输入手写签名进行认证过程中，调用存储器中存储的签名模板数据。
其中，预输入手写签名指的是用户进行签名认证前，保存一些模板数据，做为签名认证时，对比的依据。
步骤S108，终端的处理器将上述匹配率与预存的匹配率阈值对比，当上述匹配率不低于预存的匹配率阈值时，指示显示面板显示用户输入手写签名认证通过的提示信息。
其中，匹配率阈值可以由终端预设，在用户输入签名认证时直接从存储器中调用。
另外，匹配率阈值还可根据终端实际处在的环境，做调整。此时，终端 可通过其通信单元1连接的网络判断其所在的环境。根据其所在的环境，确定终端所在环境的安全等级，并从存储器中调用该安全等级下的匹配率阈值。其中，在终端的存储器中，存储有不同网络对应的环境的列表、存储有不同环境对应的安全等级的列表、以及存储有不同安全等级对应的匹配率阈值的列表。进一步，可直接存储不同网络或环境对应的匹配率阈值的列表。用户可直接通过网络或环境调用其对应的匹配率阈值。
本发明实施例提供的签名认证方法、终端、手写笔及系统，终端和手写笔同时检测签名的相关数据，将签名的相关数据与预存的签名模板数据对比匹配，并根据匹配率确定签名认证是否通过。
本发明实施例在用户使用手写笔在终端的触摸面板输入手写签名的过程中，通过手写笔提取更多的用户签名特征数据，对比匹配，使得攻击者在模仿用户笔迹的同时，还要模仿用户的手部动作，增加攻击者模仿用户签名信息的难度，极大幅度提高了签名认证系统的安全性。
本发明实施例还可根据终端所在环境，设定不同的匹配率阈值，具有很好的应用前景。同时，采用本发明实施例提出，用户可提前预存多个签名模板，可以降低人为因素导致的认证失败率，使得用户输入签名具有更高的灵活性。
本发明实施例还可对手写笔和终端的触摸面板的两个坐标系进行变换，并将手写笔的运动轨迹在触摸面板所在的平面上进行投影，避免了在原先两个坐标系中，可能会对应的同一特征点在两个坐标系中的坐标数据匹配对比的情况。本发明实施例还将手写笔的运动轨迹在与触摸面板所在平面垂直的两个平面上进行投影，将三维坐标对比简化成二维坐标对比的方式，简化了对签名数据对比匹配的复杂度。
专业人员应该还可以进一步意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能 一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以通过程序来指令处理器完成，所述的程序可以存储于计算机可读存储介质中，所述存储介质是非短暂性(英文：non-transitory)介质，例如随机存取存储器，只读存储器，快闪存储器，硬盘，固态硬盘，磁带(英文：magnetic tape)，软盘(英文：floppy disk)，光盘(英文：optical disc)及其任意组合。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。

Claims (22)

  1. 一种签名认证方法，其特征在于，所述方法包括：
    当用户通过手写笔在终端的触摸面板上进行签名时，所述终端检测第一签名数据，所述第一签名数据包括手写笔与所述触摸面板的接触点的坐标信息和所述接触点处手写笔对所述触摸面板的压力信息；以及，所述终端接收所述手写笔发送的第二签名数据，所述第二签名数据包括所述手写笔检测的当用户通过手写笔在所述触摸面板上进行签名时手写笔的运动轨迹信息及所述用户对所述手写笔的压力信息；
    将所述第一签名数据和所述第二签名数据与预存的签名模板数据匹配对比，得到匹配率；
    当所述匹配率不低于预设的匹配率阈值时，所述签名认证通过。
  2. 如权利要求1所述的方法，其特征在于，所述第一签名数据与所述第二签名数据的采样时间和采样频率保持同步。
  3. 如权利要求1或2所述的方法，其特征在于，所述将所述第一签名数据和所述第二签名数据与预存的签名模板数据匹配对比，得到匹配率，包括：
    所述签名对应第一签名特征点和第二签名特征点，所述第一签名特征点包括所述接触点组成的集合中的至少一个点，所述第二签名特征点包括所述所述手写笔在所述触摸面板以外区域的所述运动轨迹中的点的集合中的至少一个点；
    从所述第一签名数据和所述第二签名数据中提取所述第一签名特征点和第二签名特征点对应的数据；
    将所述第一签名特征点和第二签名特征点对应的数据与所述签名模板数据中每个特征点的数据匹配对比，得到匹配率。
  4. 如权利要求3所述的方法，其特征在于，所述第一签名特征点对应的数据包括：所述第一签名特征点对应的接触点的坐标信息、所述第一签名特征点对应的接触点处手写笔对所述触摸面板的压力信息以及在与所述第一签 名特征点的采样时间相同时手写笔的位置信息和用户对所述手写笔的压力信息；
    其中，所述手写笔的位置信息通过所述手写笔的运动轨迹信息得到。
  5. 如权利要求4所述的方法，其特征在于，所述第二签名特征点对应的数据包括：所述第二签名特征点对应的手写笔的位置信息及用户对所述手写笔的压力信息。
  6. 如权利要求1或5所述的方法，其特征在于，所述第二签名数据还包括：手写笔检测的当用户通过手写笔在所述触摸面板上进行签名时所述手写笔的加速度、所述手写笔受到用户压力的受压面积信息和受压区域的形状信息、以及所述手写笔受压区域距所述手写笔笔端的距离信息。
  7. 如权利要求3所述的方法，其特征在于，所述第一签名特征点具体包括下述点中的一个或多个、第一个接触点、最后一个接触点、不连续的接触点或曲率变化大的接触点。
  8. 如权利要求3所述的方法，其特征在于，所述第二签名特征点具体包括下述点中的一个或多个：在所述触摸面板以外区域中每段不连续的所述手写笔的运动轨迹对应的曲线中曲率最大的点，或在所述触摸面板以外区域中每段不连续的所述手写笔的运动轨迹对应的曲线中距离所述触摸面板距离最远的点。
  9. 如权利要求1或2所述的方法，其特征在于，所述将所述第一签名数据和所述第二签名数据与预存的签名模板数据匹配对比，得到匹配率，包括：
    从所述接触点中提取第一签名特征点；
    将手写笔笔端的运动轨迹在所述触摸面板所在第一平面进行投影，得到所述手写笔笔端的第一运动轨迹；将手写笔笔端的运动轨迹在与所述第一平面垂直的第二平面、第三平面进行投影，得到所述手写笔笔端的第二运动轨迹和第三运动轨迹，所述第二平面与所述第三平面垂直；
    从所述第一运动轨迹、第二运动轨迹和第三运动轨迹中的至少一个运动 轨迹中提取第二签名特征点；
    从所述第一签名数据和所述第二签名数据中提取所述第一签名特征点和第二签名特征点对应的数据；
    将所述第一签名特征点和第二签名特征点对应的数据与所述签名模板数据中每个特征点的数据匹配对比，得到匹配率。
  10. 如权利要求1所述的方法，其特征在于，根据所述终端所在的环境预设所述匹配率阈值。
  11. 一种签名认证方法，其特征在于，所述方法包括：
    当用户通过手写笔在终端的触摸面板上进行签名时，所述手写笔检测第二签名数据，所述第二签名数据包括手写笔的运动轨迹信息及所述用户对所述手写笔的压力信息；
    所述手写笔将所述第二签名数据发送给终端，以使所述终端根据所述第二签名数据及所述终端检测的第一签名数据确定所述签名认证是否通过，所述第一签名数据包括手写笔与所述触摸面板的接触点的坐标信息和所述接触点处手写笔对所述触摸面板的压力信息。
  12. 如权利要求11所述的方法，其特征在于，所述第二签名数据还包括：手写笔检测的当用户通过手写笔在所述触摸面板上进行签名时所述手写笔的加速度、所述手写笔受到用户压力的受压面积信息和受压区域的形状信息、以及所述手写笔受压区域距所述手写笔笔端的距离信息。
  13. 如权利要求11或12所述的方法，其特征在于，所述第一签名数据与所述第二签名数据的采样时间和采样频率保持同步。
  14. 一种终端，其特征在于，所述终端包括：触摸面板、显示面板、传感器、处理器、存储器、通信单元；
    所述触摸面板，用于接收用户通过手写笔输入的签名；
    所述显示面板，用于显示所述签名的图像；
    所述触摸面板，还用于检测所述手写笔与所述触摸面板的接触点的坐标信息；
    所述传感器，用于检测所述接触点处手写笔对所述触摸面板的压力信息；所述接触点的坐标信息和所述接触点处手写笔对所述触摸面板的压力信息组成第一签名数据；
    所述通信单元，用于与所述手写笔建立通信连接，接收所述手写笔发送的第二签名数据，所述第二签名数据包括所述手写笔检测的当用户通过手写笔在所述触摸面板上进行签名时手写笔的运动轨迹信息及所述用户对所述手写笔的压力信息；
    所述存储器，用于存储预设的匹配率阈值；
    所述处理器，用于将所述第一签名数据和所述第二签名数据与预存的签名模板数据匹配对比，得到匹配率；当所述匹配率不低于所述预设的匹配率阈值时，指示所述显示面板显示所述签名认证通过的提示信息；
    所述显示面板，还用于显示所述签名认证通过的提示信息。
  15. 如权利要求14所述的终端，其特征在于，所述处理器，还用于向所述手写笔发送对所述手写笔的采样时间和采样频率的控制信息，以控制所述第一签名数据与所述第二签名数据的采样时间和采样频率保持同步。
  16. 如权利要求14或15所述的终端，其特征在于，所述签名对应第一签名特征点和第二签名特征点，所述第一签名特征点包括所述接触点组成的集合中的至少一个点，所述第二签名特征点包括所述所述手写笔在所述触摸面板以外区域的所述运动轨迹中的点的集合中的至少一个点；所述处理器，具体用于从所述第一签名数据和所述第二签名数据中提取所述第一签名特征点和第二签名特征点对应的数据；将所述第一签名特征点和第二签名特征点对应的数据与所述签名模板数据中每个特征点的数据匹配对比，得到匹配率。
  17. 如权利要求14或15所述的终端，其特征在于，所述处理器，具体 用于从所述接触点中提取第一签名特征点；将手写笔笔端的运动轨迹在所述触摸面板所在第一平面进行投影，得到所述手写笔笔端的第一运动轨迹；将手写笔笔端的运动轨迹在与所述第一平面垂直的第二平面、第三平面进行投影，得到所述手写笔笔端的第二运动轨迹和第三运动轨迹，所述第二平面与所述第三平面垂直；从所述第一运动轨迹、第二运动轨迹和第三运动轨迹中的至少一个运动轨迹中提取第二签名特征点；从所述第一签名数据和所述第二签名数据中提取所述第一签名特征点和第二签名特征点对应的数据；将所述第一签名特征点和第二签名特征点对应的数据与所述签名模板数据中每个特征点的数据匹配对比，得到匹配率。
  18. 如权利要求14所述的终端，其特征在于，所述处理器，还用于根据所述通信单元连接的网络确定所述终端所在的环境，根据所述终端所在的环境预设所述匹配率阈值。
  19. 一种手写笔，其特征在于，所述手写笔包括：传感器单元、处理器、通信单元；
    所述传感器单元，用于当用户通过手写笔在终端的触摸面板上进行签名时，检测所述手写笔的运动轨迹信息及所述用户对所述手写笔的压力信息；
    所述处理器，用于将所述手写笔的运动轨迹信息及所述用户对所述手写笔的压力信息转换成所述终端能够处理的第二签名数据，并指示所述通信单元发送给终端；
    所述通信单元，用于与所述终端建立通信连接，并将所述第二签名数据发送给所述终端。
  20. 如权利要求19所述的手写笔，其特征在于，所述传感器单元，还用于当用户通过手写笔在终端的触摸面板上进行签名时，检测所述手写笔的加速度、所述手写笔受到用户压力的受压面积信息和受压区域的形状信息、以及所述手写笔受压区域距所述手写笔笔端的距离信息。
  21. 如权利要求19或20所述的手写笔，其特征在于，所述通信单元，还用于接收所述终端发送的对所述传感器单元的采样时间和采样频率的控制信息，以控制所述第一签名数据与所述第二签名数据的采样时间和采样频率保持同步。
  22. 一种签名认证系统，其特征在于，包括上述权利要求14-18所述的终端和上述权利要求19-21所述的手写笔。
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