WO2012124383A1 - 移動情報端末及び把持特徴認証方法 - Google Patents
移動情報端末及び把持特徴認証方法 Download PDFInfo
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- WO2012124383A1 WO2012124383A1 PCT/JP2012/051750 JP2012051750W WO2012124383A1 WO 2012124383 A1 WO2012124383 A1 WO 2012124383A1 JP 2012051750 W JP2012051750 W JP 2012051750W WO 2012124383 A1 WO2012124383 A1 WO 2012124383A1
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- terminal
- environmental
- authentication
- template
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
- G06F1/3231—Monitoring the presence, absence or movement of users
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/3287—Power saving characterised by the action undertaken by switching off individual functional units in the computer system
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
- G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/81—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer by operating on the power supply, e.g. enabling or disabling power-on, sleep or resume operations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
- H04M1/667—Preventing unauthorised calls from a telephone set
- H04M1/67—Preventing unauthorised calls from a telephone set by electronic means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2139—Recurrent verification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2250/00—Details of telephonic subscriber devices
- H04M2250/12—Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Definitions
- the present invention relates to a mobile information terminal and a gripping feature authentication method for acquiring a gripping feature sample when the mobile information terminal is gripped and performing identity authentication.
- Patent Document 1 the position of the portable information terminal held by the user at the time of user authentication is acquired by a plurality of pressure sensors, and the position held by the user after the user authentication is performed.
- a portable information terminal that invalidates data necessary for receiving a service input by a user and cancels the effect of the already performed personal authentication. For this reason, even if the mobile information terminal is stolen while performing the personal authentication and inputting the data necessary for receiving the provision of the service, the personal authentication and Data entered by the user is invalid. In this way, in order to receive the provision of the service after the personal authentication is invalidated, the personal authentication is required again, so that unauthorized use by a third party can be effectively prevented.
- the difference in the terminal state refers to, for example, a difference in the application activation status of the terminal (browser browsing, e-mail, telephone conversation), a difference in the exercise state of the user using the terminal (walking, running, stationary), etc. .
- various sensors for acquiring the environment to which the mobile information terminal belongs are first built in the mobile information terminal in order to detect the difference between these terminal states. In order to follow the change of the terminal state, it is necessary to always drive. If these sensors are always driven and used for personal authentication, the power consumption of the mobile information terminal becomes enormous and the convenience for the user is impaired.
- the mobile information terminal of the present invention is characterized in that it acquires a gripping feature sample when it is gripped and authenticates itself, a gripping feature sample acquisition unit, an environment sensor group, a terminal state detection unit, a template A storage unit, a template selection unit, a personal authentication unit, a personal level monitoring unit, and a power control unit are provided.
- the gripping feature sample acquisition unit acquires a gripping feature sample.
- the environmental sensor group includes one or more sensors that acquire environmental information to which the mobile information terminal belongs and output an environmental signal.
- the terminal state detection unit acquires an environmental signal and detects a set of one or more terminal states of the mobile information terminal as an environmental state.
- the template storage unit stores a personal authentication template suitable for each environmental state.
- the template selection unit acquires the detected environmental state and selects a personal authentication template that matches the environmental state.
- the personal authentication unit collates the acquired gripping feature sample with the selected personal authentication template and outputs a personal authentication result.
- the personal level monitoring unit acquires the personal authentication result, and when the personal level that changes according to the personal authentication result changes beyond a predetermined threshold corresponding to each sensor, the sensor power is turned off. A signal is output, and if the principal level changes below the threshold, a sensor power ON signal is output.
- the power supply control unit stops energization of the sensor corresponding to the threshold value when the sensor power supply OFF signal is acquired, and energizes the sensor corresponding to the threshold value when the sensor power supply ON signal is acquired.
- the sensors included in the environmental sensor group can be energized or de-energized according to the person level. Therefore, when the person level is high, the energization of the sensor is stopped to save power. Can be realized.
- the sensor when the personal level is low, the sensor can be energized to detect the environmental state of the mobile information terminal, and personal authentication can be performed using a personal authentication template that matches each environmental state. User authentication can be realized.
- FIG. 5A is a diagram illustrating a first example of energization and energization stop patterns of mobile terminals according to all the embodiments
- FIG. 5B is a second example of energization and energization stop patterns of the mobile terminals according to all embodiments.
- FIG. 5C is a diagram showing a third example of energization and energization stop patterns of the mobile terminals according to all the examples
- FIG. 5D is an energization and energization stop pattern of the mobile terminals according to all the examples.
- It is a figure which shows the 4th example.
- FIG. 7A is a diagram showing an example of a personal authentication template used when energization of a part of the sensors of the mobile terminals according to all the embodiments is stopped
- FIG. 7B is a part of the sensors of the mobile terminals according to all the embodiments.
- FIG. 7A is a diagram showing an example of a personal authentication template used when energization of a part of the sensors of the mobile terminals according to all the embodiments is stopped
- FIG. 7B is a part of the sensors of the mobile terminals according to all the embodiments.
- FIG. 7C is a diagram showing another example of the personal authentication template used when the power supply is stopped, and FIG. 7C is still another example of the personal authentication template used when a part of the sensors of the mobile terminal according to all the embodiments is turned off. It is a figure which shows an example. The figure which illustrates about the principal level which the portable terminal which concerns on all the Examples uses.
- 1 is a block diagram showing a configuration of a mobile terminal according to Embodiment 1.
- FIG. 5 is a flowchart illustrating the operation of the mobile terminal according to the first embodiment.
- FIG. 6 is a block diagram illustrating a configuration of a mobile terminal according to a second embodiment.
- 10 is a flowchart showing the operation of the mobile terminal according to the second embodiment.
- Examples of devices that embody the mobile information terminal of the present invention include a portable terminal, a PDA, a portable game machine, an electronic notebook, and an electronic book dedicated terminal. However, the device is not limited to the listed devices.
- Any mobile information terminal of the present invention can be used. In the description of the embodiment, a mobile terminal will be described in detail as a specific example.
- gripping feature samples acquired by portable terminals 500 and 500 ′ described later according to all embodiments of the present invention will be described. Humans are inherently different in (1) finger length, (2) strength of grip, etc., and (3) habit when holding a mobile terminal, etc.
- the gripping feature is very excellent as biometric information used for personal authentication. Specifically, the gripping feature authentication has the same degree of accuracy as general face authentication in the person rejection rate and the other person acceptance rate.
- Examples of the gripping feature sample include a gripping pressure distribution, a gripping shape distribution, and a gripping heat / heat distribution.
- a gripping pressure distribution can be acquired by distributing pressure sensors on the surfaces of the mobile terminals 500 and 500 ′.
- the grip shape distribution can be acquired by the distribution arrangement of the CCD (CMOS) sensor.
- CMOS CCD
- the pressing state of the operation key (touch panel) when the terminal is gripped whether the operation key or touch panel is pressed).
- the gripping feature can also be acquired by.
- FIG. 1 is a diagram illustrating a state where portable terminals 500 and 500 ′ according to all embodiments are held.
- FIG. 2 is a diagram illustrating a gripping pressure distribution output by a pressure sensor array laid on the surface of the mobile terminals 500 and 500 ′ according to all the embodiments.
- the portable terminals 500 and 500 ' are assumed to be general folding portable terminals, and are connected so that one end in the short direction of two long plate-shaped bodies can be folded by a connecting shaft. One body is provided with operation keys.
- the key arrangement surface 11 is the surface on which the operation keys are arranged, the left and right side surfaces of the key arrangement surface 11 are the left side surface 12, the right side surface 13, the back surface of the key arrangement surface 11 is the back surface 14, and the lower side surface of the key arrangement surface 11 ( The surface opposite to the surface having the connecting shaft is called the lower surface 15.
- a liquid crystal screen 16 is arranged on a surface facing the key arrangement surface 11 when the other body is folded.
- the mobile terminals 500 and 500 ' are configured in this way, the above description is merely an example for explaining in detail a gripping pressure distribution output by a pressure sensor array described later. Therefore, the portable terminals 500 and 500 'do not necessarily have to be a folding type as shown in FIG. 1, and may have any shape such as a straight type, a slide type, or the like.
- a pressure sensor array 105 is installed on the body of the portable terminal 500, 500 'on which the key arrangement surface 11 is arranged so as to be able to sense external gripping pressure (broken line portion in FIG. 2).
- the pressure sensor array 105 can detect gripping pressure distributions on the left side surface 12, the right side surface 13, and the back surface 14 of the portable terminals 500 and 500 ′. If signals from the pressure sensors in the pressure sensor array 105 are analyzed, FIG. It is possible to draw a gripping pressure distribution as shown in FIG. From the grasping pressure distribution in FIG. 2, it can be seen that the features of the user's fingers and gripping force are clearly shown on the left side surface 12, the right side surface 13, the back surface 14, and the like. The gripping pressure distribution acquired in this way can be used for the gripping feature sample used in the present invention.
- FIG. 3 is a diagram illustrating the environment sensor group built in the portable terminals 500 and 500 ′ according to all the embodiments.
- the environmental sensor group is a set of sensors including one or more types of sensors for acquiring an environment to which the mobile terminal belongs. There are no restrictions on the sensors used as the environmental sensor group in the present invention, and any type of sensors can be combined within the range of size and cost that can be mounted on a portable terminal.
- an environmental sensor group 510 is an example of a desirable environmental sensor group.
- the environment sensor group 510 includes an acceleration sensor 511, a gyroscope 512, a microphone 513, an environment light sensor 514, a position information sensor 515, and an application sensor 516.
- the acceleration sensor 511 for example, a three-axis acceleration sensor is often used for mounting on a portable terminal.
- the triaxial acceleration sensor include a piezoresistive triaxial acceleration sensor, a capacitance triaxial acceleration sensor, and a heat detection triaxial acceleration sensor.
- the gyroscope 512 for example, a MEMS gyroscope is often used for mounting on a portable terminal. MEMS (Micro Electro Mechanical Systems) is a device in which sensors, electronic circuits, and the like are integrated on a single silicon substrate.
- MEMS Micro Electro Mechanical Systems
- the microphone 513 it is desirable to provide a small microphone separate from the one for calling.
- the ambient light sensor 514 for example, a phototransistor type small illuminance sensor can be used.
- the position information sensor 515 is a function for acquiring the position information of the own terminal from a GPS satellite or a base station. Therefore, the entity corresponds to an algorithm implementation circuit that transmits and receives radio waves. Any of these sensors can be built in a portable terminal, and the mounting is particularly advanced in smartphones and the like. Moreover, since the application sensor 516 detects the activation status of the application in the mobile terminal, the entity corresponds to an algorithm implementation circuit. For example, the position information is registered within a predetermined number in descending order of use frequency by learning the position where the mobile terminal is used.
- any type of sensor may be combined as long as it is within the range of mountable size and cost, and any one may be used. Therefore, not only the above-described example of the environmental sensor group 510, but the environmental sensor group may be configured as an environmental sensor group 510 ', for example.
- the environmental sensor group 510 ′ includes an environmental light sensor 514 included in the environmental sensor group 510, a proximity sensor 517, and a geomagnetic sensor 518 instead of the position information sensor 515.
- the number of types of sensors constituting the environmental sensor group may be any number, for example, it may be configured by a total of three types of sensors such as the environmental sensor group 510 ′′.
- Information relating to the environment to which the mobile terminal belongs detected by each sensor constituting the environmental sensor group is output from the environmental sensor group as an environmental signal.
- an environmental signal For example, gravity direction information output from the acceleration sensor 511, vibration information, motion information, impact detection information, angle information output from the gyroscope 512, angular velocity information, angular acceleration information, and volume output from the microphone 513 as the environmental signal (Level) information, frequency information, and the like.
- the term “environment signal” is used in the meaning of all signals that output environment information obtained as a result of measuring the environment by the above-described sensor.
- FIG. 4 is a diagram illustrating terminal states detected by the mobile terminals 500 and 500 ′ according to all the embodiments, in which the types of terminal states in the row direction have a large influence on gripping features from left to right, Possible states in each terminal state are shown in the column direction.
- information indicating which application is currently activated by the mobile terminals 500 and 500 ′ is output as environment information from the application sensor 516.
- a browser function for example, there are a browser function, a mail function, a call function, a menu function, a camera function, a game function, a schedule function, a moving image browsing function, and the like as examples of activated applications.
- the user's current usage status of the application can be known.
- these are referred to as “application activation status” and are one of the types of terminal states.
- the environmental information from the acceleration sensor 511 includes gravity direction information, vibration information, and impact detection information. Further, there are angle information, angular velocity information, angular acceleration information, and the like output from the gyroscope 512. Surrounding sound environment information is output from the microphone 513. By analyzing this information, whether the user of the mobile device 500, 500 ′ is currently stationary, walking, running, going down the stairs, or going up the stairs You can see whether you are in the middle of a train, standing on a train, sitting on a train, and so on. In the present specification, these are referred to as “exercise states” and are regarded as one of the types of terminal states. In this specification, for convenience of explanation, only (1) stationary (2) steps (3) running (4) stairs (down) (5) stairs (up) (6) only six states of a train are detected as exercise states And These six states are assigned state numbers 1 to 6 in order.
- operation postures are regarded as one of the types of terminal states.
- operation postures it is assumed that only five states of (1) standing position (2) sitting position (3) side lying position (4) supine position (5) prone position are detected as operation postures. These five states are assigned state numbers 1 to 5 in order.
- illuminance information as environmental information from the ambient light sensor 514.
- illuminance information By analyzing the illuminance information, it is possible to know how bright the environment is when the user operating the portable terminal 500, 500 'is converted to a brightness scale defined by a human perception threshold.
- the brightness scale defined by these human perception thresholds is called “brightness” and is one of the types of terminal states.
- position information of the portable terminals 500 and 500 ′ as environmental information from the position information sensor.
- location information is one of the types of terminal states.
- the way of gripping the user with respect to the portable terminals 500 and 500 ' may differ depending on the terminal state described above.
- the user's gripping method is quite different when he / she is making a mail, when taking a picture using a camera, or when talking.
- the gripping method of the user or the characteristics of the gripping pressure distribution acquired as a gripping feature sample is different. The same applies to the operation posture.
- the visibility of the operation keys of the mobile terminals 500 and 500 ′ is different between when the surroundings are bright and when the surroundings are dark, there is a slight influence on how the user grips.
- the terminal state when the terminal state changes, the user's way of gripping may change.
- a change in the application activation status has a very large influence on the gripping method, while a change in position information does not significantly affect the gripping method. Therefore, in the present invention, for example, the five terminal states, which have the largest influence on the gripping method, are listed in the order of application activation state, exercise state, operation posture, brightness, and position information.
- the status number 2-2-1-2-1 using the status number assigned to each terminal status It expresses.
- [browse browser-in train-sitting-normal brightness-point B] is expressed as environmental state 1-6-2-3-2.
- the personal authentication template is a template representing the gripping characteristics of the user.
- the personal authentication template is learned from an average value of the above-described gripping feature samples obtained in advance from a user.
- the learned personal authentication template is collated with a gripping feature sample newly acquired after learning. Whether or not the gripping feature sample newly acquired after learning is the same person as the personal authentication template is determined based on the magnitude (for example, Mahalanobis general distance) obtained by the collation.
- the gripping feature sample necessary for learning the personal authentication template can be acquired simultaneously with the generation of the sampling trigger.
- x i, j be the pressure value acquired by the i-th sensor element in the j-th measurement to be used for learning.
- m is the maximum number of gripping feature measurements for use in learning.
- Each is an integer of 2 or more.
- the mean, variance, and vector of pressure values are defined as follows:
- the average vector of gripping feature samples is used as a personal authentication template.
- the subscript "le” is added to the personal authentication template.
- the Mahalanobis generalized distance f 1 is expressed by the following equation.
- the Euclidean distance f 2 is defined as follows.
- the Manhattan distance f 3 is defined as follows.
- the above three distance references can be determined in common using the determination formulas shown below.
- the subscript “self” is attached to the data of the person acquired for the determination process, and the subscript “oth” is attached to the data of the other person. If the threshold value for determining another person is defined as x thre , the expression for determining another person can be expressed as follows. x thre ⁇ oth f
- the other person's gripping feature sample data is incorporated in the product of the mobile terminal in advance, or is made accessible to the user on the network, or the user acquires the data by holding the mobile terminal by another person.
- the distance oth f is calculated from the other person's data and the personal authentication template. Further, the criterion for determining x thre is determined so as to satisfy the following condition after calculating the distance self f from the gripping feature sample of the person who has not been used for template learning and the template after learning. self f ⁇ x thre ⁇ oth f
- Sampling trigger is the preset timing for acquiring gripping feature samples.
- a sampling trigger in the current environmental state is generated.
- a sampling trigger may be generated each time the determination key is pressed, or a sampling trigger may be generated in response to the determination key pressing in any terminal state other than the application activation status
- a sampling trigger may be generated in response to pressing of a predetermined key other than the enter key in an arbitrary terminal state. In any case, when the sampling trigger is generated, the gripping feature sample at that time is acquired corresponding to the environmental state at that time.
- the sampling trigger can be set as “browser activation key pressed”.
- This sampling trigger “when the browser is activated and the determination key is pressed” is acquired when the browser is activated and when the user presses the determination key of the portable terminal 500 or 500 ′, this operation is used as a sampling trigger to immediately acquire a gripping feature sample. It means that. If you want to acquire a gripping feature sample during a call where you do not often press an operation key such as the Enter key, for example, set the sampling trigger to “Once every 3 minutes” and the call state will continue for 3 minutes. Alternatively, a sampling trigger may be automatically generated to acquire a gripping feature sample.
- the gripping feature sample necessary for learning the personal authentication template using the sampling trigger has the following advantages. If the sampling trigger is used, the gripping feature sample is automatically acquired and accumulated by using the user's own key operation as an acquisition timing. As a result, it is possible to acquire gripping feature samples in a state where the user is unconscious and using the terminal in the most natural state and in a relaxed state, and the variance of the observation values of the gripping feature samples can be reduced. In addition, when a gripping feature sample is declared in advance, the user who has received the declaration will be prepared and will try to grip according to the “correct gripping method” that the user thinks instead of the usual gripping method. There is.
- the personal authentication template is stored in advance in the mobile terminal.
- the mobile terminals 500 and 500 'of the present invention have a learning function of the personal authentication template. Shall.
- the identity authentication template corresponding to environmental status 2-1-1-3-2 (mail-stationary-standing-normal-point B) is represented by 2-1-1-3-2, for example, terminal status 1-4
- the identity authentication template corresponding to -1-2-1 (Browser-Staircase (down)-Standing-Slightly bright-Point A) is represented by 1-4-1-2-1.
- FIGS. 5A, 5B, 5C, and 5D are diagrams schematically illustrating four mode patterns of energization and deenergization of the mobile terminals 500 and 500 ′ according to all the embodiments, and FIG. 5A is an awake mode, 5B shows an example of a partial sleep mode, FIG. 5C shows an example of a sleep mode, and FIG. 5D shows an example of an advanced sleep mode.
- Blocks 511 to 516 in FIGS. 5A to 5D represent the acceleration sensor 511, gyroscope 512, microphone 513, ambient light sensor 514, position information sensor 515, and application sensor 516 of FIG. 3A as symbols, and blocks 520 to 520 in FIGS. 5A to 5C.
- Reference numerals 550, 555, and 560 to 590 denote a pressure sensor array 520, a gripping feature sample acquisition unit 530, a terminal state detection unit 540, a template selection unit 550, a template storage unit 555, a personal authentication unit 560, and a personal level monitoring unit in FIG. 570, the power supply control unit 580, and the terminal lock unit 590 are represented as symbols.
- blocks 520, 530, 550, 560, and 590 in FIG. 5D are the same as the corresponding ones in FIGS. 5A to 5C, and blocks 540 ′, 570 ′, and 580 ′ in FIG. 5D are terminal status detection in FIG.
- the unit 540 ′, the principal level monitoring unit 570 ′, and the power supply control unit 580 ′ are represented as symbols.
- the awake mode shown in FIG. 5A is a mode in which all sensors (acceleration sensor 511, gyroscope 512, microphone 513, ambient light sensor 514, position information sensor 515 application) included in the above-described environment sensor group 510 are provided.
- the sensor 516) is in an energized state.
- the partial sleep mode shown in FIG. 5B in this mode, some of the sensors included in the environmental sensor group 510 described above are hatched, and other sensors are stopped. It is characterized by being in an energized state.
- the acceleration sensor 511, the gyroscope 512, the microphone 513, and the application sensor 516 are in the energized state, and the ambient light sensor 514 and the position information sensor 515 are in the energized stop state.
- the sleep mode shown in FIG. 5C is characterized in that energization of all the sensors included in the environmental sensor group 510 is stopped.
- the advanced sleep mode shown in FIG. 5D is a case where energization of other functional units is stopped in addition to the sensor, which will be described in detail in the second embodiment.
- FIG. 6 is a diagram illustrating a personal authentication template suitable for each environmental state of the mobile terminals 500 and 500 ′ according to all the embodiments.
- the personal authentication template used at this time is defined as “personal authentication template *-*-*-*-*”. Specific examples of the authentication template *-*-*-*-* are as follows.
- the stored identity authentication templates may be weighted by a larger coefficient in the order of increasing use frequency, and the averaged identity authentication template may be used.
- the personal authentication template only the area where the characteristic points of the gripping pressure distribution are common in all stored personal authentication templates is used as the personal authentication template, and only the information of the pressure sensor array existing in the area is used as the personal authentication template. It is good also as using for collation.
- the personal authentication can be performed using the minimum value of the Mahalanobis general distance obtained by the collation.
- the personal authentication template 1-1-1-*-* the personal authentication template corresponding to the environmental state of the mobile terminal 500, 500 ′ immediately before the sensor is deenergized is used. it can.
- a gripping pressure distribution obtained by weighting and averaging the user authentication templates 1-1-1-1-1 to 1-1-1-5-1 according to the frequency of use, or the user authentication template 1-
- the personal authentication template only the area where the characteristic points of the gripping pressure distribution are common may be used as the personal authentication template.
- five of the personal authentication templates 1-1-1-1-1 to 1-1-1-5-3 are selected in descending order of frequency of use, and all of these personal authentication templates are used for verification. It is good as well.
- FIGS. 7A, 7B, and 7C are diagrams illustrating personal authentication templates used when a part of the sensors of the portable terminals 500 and 500 'according to all the embodiments is de-energized.
- the personal authentication template used when the environmental state is browser (1) -train (6) -sitting (2) -slightly bright (2) -point B (2) is the personal authentication template. 1-6-2-2-2.
- This personal authentication template is learned by a method of acquiring a gripping feature sample at the same time as the above-described sampling trigger is generated.
- FIG. 7A for example, the personal authentication template used when the environmental state is browser (1) -train (6) -sitting (2) -slightly bright (2) -point B (2) is the personal authentication template. 1-6-2-2-2.
- This personal authentication template is learned by a method of acquiring a gripping feature sample at the same time as the above-described sampling trigger is generated.
- the personal authentication template 1-6-2-2- * is used.
- This personal authentication template is a template obtained as a secondary by the above-mentioned weighted average, extraction of only areas with common feature points, etc., or a personal authentication template in the previous environmental state, personal authentication template 1-6-2-2 -1 to 1-6-2-2-2 means authentication by part or all of it.
- 7C is a template obtained as a secondary by weighted average, extraction of only areas with common feature points, etc., or identity authentication in the previous environmental state This means authentication based on a part or all of the templates and personal authentication templates 1-6-2-1-1 to 1-6-2-5-3.
- the personal level used by the portable terminals 500 and 500 ′ of the present invention increases when the personal authentication by the portable terminals 500 and 500 ′ of the present invention succeeds, and decreases when the personal authentication fails.
- the authentication success rate in the last N times (N is an integer of 1 or more) of personal authentication can be used. It is assumed that the authentication count is reset when a state where the portable terminals 500 and 500 ′ are not held for a certain period of time continues. In a state where the number of authentications is less than N, the authentication success rate for all the authentications is used.
- the personal level is not limited to the authentication success rate described above, and the total number of authentication successes can also be used. In this case, when the number of successful authentications reaches a predetermined upper limit, it is desirable not to perform addition for subsequent successful authentications, and to design so that the person level is saturated at a certain value.
- the sensors of the environmental sensor group 510 enter a sleep mode by stopping energization of sensors that satisfy certain conditions in order to realize power saving. This certain condition is determined by whether or not the principal level exceeds a predetermined threshold value.
- the application activation status, the exercise state, the operation posture, the brightness, and the position information which are types of terminal states, have different influences on the way the user holds. As described above, the difference in the application activation status greatly affects the way of gripping. Compared with this, the influence of the difference in position information on the way of gripping is small.
- a small threshold is set for the terminal state type (for example, position information) that has a small influence on the gripping method
- a large threshold is set for the terminal state type (for example, an application activation state) that has a large influence on the gripping method.
- a threshold value can be set and the threshold value can be set to be hierarchical.
- FIG. 8 is a diagram illustrating the personal level used by the mobile terminals 500 and 500 ′ according to all the embodiments.
- the authentication success rate in the last 30 user authentications is used as the user level.
- the user uses his / her smartphone (having the function of the portable terminal 500 of the present invention, hereinafter referred to as the portable terminal 500) for a long time, and lies on his back at home (referred to as point A). It is assumed that the user is browsing (browser) while lying (resting, standing still), and the user's surroundings have an illuminance of about 400 lx (slightly bright).
- the environmental condition is 1-1-4-2-1.
- the portable terminal 500 selects a personal authentication template 1-1-4-2-1 corresponding to the environmental state 1-1-4-2-1 and uses it for personal authentication.
- the identity level rapidly increases.
- the threshold level (position information) 0.5, which is set to the lowest personal level, passes through the position information sensor 515 that controls the position information.
- the portable terminal 500 has shifted to the partial sleep mode.
- the mobile terminal 500 continues the personal authentication using the personal authentication template 1-1-4-2-2 *.
- the user authentication template 1-1-4-2-1 used in the environmental state immediately before the transition to the partial sleep mode is continued as the user authentication template 1-1-4-2-2- *.
- the mobile terminal 500 continues the personal authentication using the personal authentication template 1-1-4-*-*.
- the personal authentication template 1-1-4-2-1 is continuously used as the personal authentication template 1-1-4-*-*.
- the acceleration sensor 511, the gyroscope 512, and the microphone 513 that control the operation posture are also used in an exercise state that is a higher-level terminal state, energization of these sensors does not stop.
- the energization to the algorithm circuit used only for detecting the operation posture is stopped.
- the mobile terminal 500 continues the personal authentication using the personal authentication template 1-1-*-*-*.
- the personal authentication template 1-1-4-2-1 is continuously used as the personal authentication template 1-1-*-*-*.
- the acceleration sensor 511, the gyroscope 512, and the microphone 513 that control the motion state is stopped.
- the mobile terminal 500 continues the personal authentication using the personal authentication template 1-*-*-*-*.
- the personal authentication template 1-1-4-2-1 is continuously used as the personal authentication template 1-*-*-*-*.
- the power supply to the application sensor 516 that controls the application activation state is stopped.
- the mobile terminal 500 continues the user authentication using the user authentication template *-*-*-*-*-*.
- the personal authentication template 1-1-4-2-1 is continuously used as the personal authentication template *-*-*-*-*.
- the environment sensor group 510 of the portable terminal 500 has shifted to the sleep mode.
- each sensor of the environmental sensor group 510 stops energizing in descending order of importance (small influence on the way of gripping), so the personal authentication function remains.
- power saving can be realized.
- the mobile terminal 500 assumes that the user is browsing the browser while lying down at home, and sequentially turns off the sensor. Electric power can be greatly reduced.
- the mobile terminal 500 since the user browsed the website while lying on his back at home in a slightly bright environment for a long time, the mobile terminal 500 shifted to the sleep mode. It is assumed that the user leaves the home with 500 and starts talking (talking) with a friend while walking (walking, standing) near the ticket gate (point B) of the nearest station of the home. The surroundings of the user are assumed to have an illuminance of about 900 lx (very bright). Therefore, the environmental condition is 3-2-1-1-2.
- the mobile terminal 500 continues the personal authentication using the personal authentication template 3-*-*-*-*.
- the mobile terminal 500 combines the newly acquired application activation state “call (3)” with the environmental state 1-1-4-2-1 that is the last acquired complete environmental state. Assuming that the environmental condition is 3-1-4-2-1, the corresponding personal authentication template 3-1-4-2-1 is identified as the personal authentication template 3-*-*-*-*. Shall be used.
- the mobile terminal 500 continues the personal authentication using the personal authentication template 3-2-*-*-*.
- the mobile terminal 500 combines the newly acquired environmental state 3-2-*-*-* and the last acquired environmental state 1-1-4-2-1.
- the current environmental condition is 3-2-4-2-1
- the corresponding personal authentication template 3-2-4-2-1 is the personal authentication template 3-2-*-* -It shall be used as *.
- energization to the algorithm circuit that controls the operation posture is resumed.
- a new operation posture “standing position (1)” is acquired.
- the mobile terminal 500 continues the personal authentication using the personal authentication template 3-2-1-*-*.
- the mobile terminal 500 combines the newly acquired environmental state 3-2-1-*-* with the environmental state 1-1-4-2-1 which is the last acquired complete environmental state.
- energization to the ambient light sensor 514 that controls brightness is resumed. As a result, a new brightness “very bright (1)” is acquired.
- the mobile terminal 500 continues the personal authentication using the personal authentication template 3-2-1-1- *.
- the mobile terminal 500 combines the newly acquired environmental state 3-2-1-1- * with the last acquired environmental state 1-1-4-2-1. Estimating that the current environmental condition is 3-2-1-1-1, the corresponding personal authentication template 3-2-1-1-1 is used as the personal authentication template 3-2-1-1. -It shall be used as *.
- the portable terminal 500 has shifted to the awake mode. As a result, new position information “point B (2)” is acquired.
- the mobile terminal 500 continues the personal authentication using the personal authentication template 3-2-1-1-2.
- the personal authentication is performed using the personal authentication template 3-2-1-1-2 that perfectly matches the environmental state 3-2-1-1-2, so that the personal level rises again and the personal level As the mobile phone 500 rises, the portable terminal 500 shifts to the partial sleep mode again to save power.
- the personal level is changed from the decrease to the increase only after the portable terminal 500 shifts to the awake mode.
- the present invention is not limited to this. For example, only a part of the sensors is restarted. Even if the identity authentication template selected in the partial sleep mode is sufficiently accurate, the identity level may change from decreasing to increasing even at this point.
- a personal authentication template 3-2-*-*-* (3-2-4-2-1) that does not completely conform to the environmental state 3-2-1-1-2 is used. However, if this personal authentication template 3-2-*-*-* is sufficiently similar to the personal authentication template 3-2-1-1-2, the personal level will shift from decrease to increase at this point.
- FIG. 8 the specific example using FIG.
- the user himself / herself holds the portable terminal 500. However, for example, when this is someone other than the user, the portable terminal 500 needs to be locked. Therefore, a personal threshold value may be set for the principal level, and the portable terminal 500 may be locked when the principal level changes below the principal threshold value. In the example of FIG. 8, the personal threshold is set to 0.3.
- FIG. 9 is a block diagram illustrating a configuration of the mobile terminal 500 according to the present embodiment.
- FIG. 10 is a flowchart illustrating the operation of the mobile terminal 500 according to the present embodiment.
- the portable terminal 500 of this embodiment includes an environment sensor group 510, a pressure sensor array 520, a gripping feature sample acquisition unit 530, a terminal state detection unit 540, a template selection unit 550, a template storage unit 555, and personal authentication. 560, a person level monitoring unit 570, a power control unit 580, and a terminal lock unit 590.
- the environment sensor group 510 includes the acceleration sensor 511, the gyroscope 512, the microphone 513, the environment light sensor 514, the position information sensor 515, and the application sensor 516.
- the gripping feature sample acquisition unit 530 has a learning unit 535 as indicated by a broken line.
- a personal authentication template is generated by learning from a gripping feature sample acquired in advance in the learning mode and stored in the template storage unit 555, and power saving using personal authentication according to this invention is performed in the subsequent operations.
- the learning mode will be briefly described.
- the learning mode of the personal authentication template is started by the learning unit 535 of the gripping feature sample acquisition unit 530.
- the gripping feature sample acquisition unit 530 acquires a gripping feature sample from the pressure sensor array 520 and supplies the gripping feature sample to the learning unit 535, and the five types of terminal states at that time are environmental sensor groups.
- the learning unit 535 collects a predetermined number of gripping feature samples for each environmental state, generates an average of the gripping feature samples for each environmental body as described above, and stores it in the template storage unit 555.
- the power saving process using the personal authentication operation of the portable terminal according to the present invention is executed as follows.
- the gripping feature sample acquisition unit 530 acquires a gripping feature sample (S530).
- the terminal state detection unit 540 acquires an environmental signal and detects the environmental state of the mobile terminal 500 (S540a). If no gripping feature sample is acquired, the process returns to the start (S535N).
- the template selection unit 550 acquires the detected environmental state, and selects a personal authentication template that matches the environmental state from the template storage unit 555 (S550).
- the personal authentication unit 560 performs personal authentication by comparing the acquired gripping feature sample with the selected personal authentication template, and outputs the personal authentication result (S560).
- the personal level monitoring unit 570 acquires the personal authentication result, and when the personal authentication result is successful authentication (S565Y), the personal level is raised (S570a), and the personal authentication result is an authentication failure. (S565N), the principal level is lowered (S570b), and if the principal level changes beyond a predetermined threshold corresponding to each sensor (S575aY), a sensor power OFF signal is output, When the personal level changes below the threshold (S575bY), a sensor power ON signal is output. On the other hand, when the personal level does not change across the threshold (S575aN, S575bN), the process returns to the start.
- the power supply control unit 580 stops energization of the sensor corresponding to the threshold value when the sensor power supply OFF signal is acquired (S580a), and energizes the sensor corresponding to the threshold value when the sensor power supply ON signal is acquired. (S580b).
- the personal level monitoring unit 570 outputs a terminal lock signal, and the terminal lock unit 590 carries the mobile phone when acquiring the terminal lock signal.
- the terminal 500 is locked (S590). If the personal level does not fall below the predetermined personal threshold (S575cN), the process returns to the start.
- the sensors included in the environmental sensor group 510 can be energized or stopped according to the principal level. Power saving can be realized by stopping energization.
- the sensor when the personal level is low, the sensor can be energized to detect the environmental state of the mobile terminal 500, and personal authentication can be performed using a personal authentication template that matches each environmental state. Identity authentication can be realized.
- FIG. 11 is a block diagram illustrating a configuration of a mobile terminal 500 ′ according to the present embodiment.
- FIG. 12 is a flowchart showing the operation of the mobile terminal 500 'according to the present embodiment.
- the difference between the portable terminal 500 ′ of the present embodiment and the portable terminal 500 of the first embodiment is that the terminal state detection unit 540, the person level monitoring unit 570, and the power supply control unit 580 provided in the portable terminal 500 of the first embodiment are different from the second embodiment.
- the mobile terminal 500 ′ is replaced with a terminal state detection unit 540 ′, a principal level monitoring unit 570 ′, and a power supply control unit 580 ′. Therefore, the components having the same numbers that are used in common in the portable terminal 500 of the first embodiment and the portable terminal 500 ′ of the present embodiment perform exactly the same operation, and thus the description thereof is omitted.
- a new authentication suspension threshold is provided.
- the authentication suspension threshold is characterized by being set to a value that is the same as or higher than the highest threshold (application activation status).
- the principal level monitoring unit 570 ′ outputs an authentication suspension signal, and when the power supply control unit 580 ′ acquires the authentication suspension signal. Stops supplying power to the pressure sensor array 520, the gripping feature sample acquisition unit 530, the template storage unit 555, the template selection unit 550, the personal authentication unit 560, the personal level monitoring unit 570 ′, and the terminal lock unit 590, and to the acceleration sensor 511 Is resumed (S580′c).
- This state is called an advanced sleep mode and is shown in FIG. 5D.
- the intention of resuming energization of the acceleration sensor 511 is that when a large acceleration change is detected by the acceleration sensor, this is regarded as a sign that the user changes the environmental state, and the advanced sleep mode is terminated. This is to resume the personal authentication. If the threshold for the application activation state is equal to the authentication suspension threshold, the partial sleeve mode is directly shifted to the advanced sleeve mode, and the sleeve mode of FIG. 5C does not occur.
- energization to the acceleration sensor 511 is resumed.
- the present invention is not limited to this.
- energization to the application sensor 516 may be resumed, or energization to the gyroscope 512 may be resumed.
- the description will be continued assuming that energization to the acceleration sensor 511 is resumed.
- the terminal state detection unit 540 ′ detects a change in acceleration of a certain value or more from the acceleration sensor 511 after the transition to the advanced sleep mode (S540′bY), the terminal state detection unit 540 ′, the pressure sensor array 520, the gripping feature sample acquisition unit 530, The power supply to the template storage unit 555, the template selection unit 550, the personal authentication unit 560, the personal level monitoring unit 570 ′, and the terminal lock unit 590 is resumed (S580′d).
- the mobile terminal 500 ′ of this embodiment has a very high personal level, and when the predetermined authentication suspension threshold is exceeded, all the components (520 to 590) used for personal authentication are connected.
- the predetermined authentication suspension threshold is exceeded, all the components (520 to 590) used for personal authentication are connected.
- the program describing the processing contents can be recorded on a computer-readable recording medium.
- the computer-readable recording medium may be any recording medium such as a magnetic recording device, an optical disk, a magneto-optical recording medium, and a semiconductor memory.
- this program is distributed by selling, transferring, or lending a portable recording medium such as a DVD or CD-ROM in which the program is recorded. Furthermore, the program may be distributed by storing the program in a storage device of the server computer and transferring the program from the server computer to another computer via a network.
- a computer that executes such a program first stores a program recorded on a portable recording medium or a program transferred from a server computer in its own storage device.
- the computer reads the program stored in its own recording medium and executes the process according to the read program.
- the computer may directly read the program from a portable recording medium and execute processing according to the program, and the program is transferred from the server computer to the computer.
- the processing according to the received program may be executed sequentially.
- the program is not transferred from the server computer to the computer, and the above-described processing is executed by a so-called ASP (Application Service Provider) type service that realizes a processing function only by an execution instruction and result acquisition. It is good.
- the program in this embodiment includes information that is used for processing by an electronic computer and that conforms to the program (data that is not a direct command to the computer but has a property that defines the processing of the computer).
- the present apparatus is configured by executing a predetermined program on a computer.
- a predetermined program on a computer.
- at least a part of these processing contents may be realized by hardware.
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Abstract
Description
本発明の移動情報端末を具体化する機器の例として携帯端末、PDA、携帯ゲーム機、電子手帳、電子書籍専用端末などがある。ただし、これら列挙した機器に限らず(1)把持しながら使用する機器であり使用時に把持特徴を取得できる、(2)携行して用いる機器であり、様々な端末状態(例えば、アプリケーションの起動状況、運動状態、操作姿勢)下で用いられる可能性がある、(3)紛失、盗難により個人情報や価値情報の流出の危険がある、以上(1)~(3)の要件を満たす機器であればどんなものでも本発明の移動情報端末とすることができる。実施例における説明では携帯端末を具体例として詳細に説明する。
まず、本発明の全ての実施例に係る後述の携帯端末500、500’が取得する把持特徴サンプルについて説明する。人間は生得的に(1)手指の長さ、(2)握る力の強さ、などが異なることに加え、後天的に(3)携帯端末を持つ時の癖、などが異なっているため、把持特徴は本人認証に用いる生体情報として非常に優れている。具体的には、把持特徴認証は、本人拒否率および他人受入率において、一般的な顔認証と同程度の精度を有する。把持特徴サンプルとしては、例えば把持圧力分布、把持形状分布、把持温熱分布などが考えられる。これらの把持特徴サンプルの取得方法としては、例えば圧力センサを携帯端末500、500’の面に分布配置することにより把持圧力分布を取得することができる。同様にCCD(CMOS)センサの分布配置により把持形状分布を取得することができる。同様に赤外線センサの分布配置により、把持温熱分布の取得が可能である。また、端末背面に操作キー(タッチパネル)が配置されているような携帯端末であれば、端末を把持したときの操作キー(タッチパネル)の押圧状況(操作キー、タッチパネルが押されているか否か)によっても把持特徴を取得可能である。
図3を参照して本発明の全ての実施例に係る携帯端末500、500’に内蔵される環境センサ群について詳細に説明する。図3は全ての実施例に係る携帯端末500、500’に内蔵された環境センサ群について例示する図である。環境センサ群とは、携帯端末が属する環境を取得するためのセンサを1種類以上備えてなるセンサの集合のことである。本発明において環境センサ群として用いられるセンサには何ら制限はなく、携帯端末に実装可能なサイズおよびコストの範囲内であればどんな種類のセンサをも組み合わせることができる。例えば、望ましい環境センサ群の例として環境センサ群510が挙げられる。環境センサ群510は、加速度センサ511、ジャイロスコープ512、マイクロホン513、環境光センサ514、位置情報センサ515、アプリセンサ516を組み合わせてなる。
図4を参照して本発明の全ての実施例に係る携帯端末500、500’が上述の環境信号を解析することで検知する端末状態について詳細に説明する。図4は全ての実施例に係る携帯端末500、500’が検知する端末状態を例示する図であり、行方向に端末状態の種類が左から右に向かって把持特徴に与える影響が大きい順に、列方向に各端末状態における取り得る状態を示している。上述のように、アプリセンサ516からの環境情報として現在携帯端末500、500’が何れのアプリケーションを起動しているかの情報が出力される。例えば起動されているアプリケーションの例として、ブラウザ機能、メール機能、通話機能、メニュー機能、カメラ機能、ゲーム機能、スケジュール機能、動画閲覧機能などがある。これによりユーザの現在のアプリケーションの使用状況がわかる。本明細書ではこれらを「アプリ起動状況」と呼び、端末状態の種別の一つとする。本明細書では説明の便宜上、アプリ起動状態として(1)ブラウザ(2)メール(3)通話(4)メニュー(5)カメラ(6)ゲームの6状態のみが検出されるものとする。これら6つの状態に順に状態番号1~6が付けられている。
従って、ここではアプリ起動状況、運動状態、操作姿勢、明るさ、位置情報の5つの端末状態のそれぞれ1つの状態の組を1つの1つの環境状態と定義することにする。
本発明の全ての実施例に係る携帯端末が本人認証時に用いる本人認証テンプレートについて詳細に説明する。本人認証テンプレートとは、ユーザの把持特徴を代表して表す雛形のことである。本人認証テンプレートは、ユーザから取得した予め決めた数の前述の把持特徴サンプルの平均値などから学習される。学習された本人認証テンプレートは、学習後に新たに取得された把持特徴サンプルと照合される。照合により求めた値(例えばマハラノビス汎距離)の大小により、学習後に新たに取得された把持特徴サンプルが本人認証テンプレートと同一人物のものであるか否かが判定される。本人認証テンプレートの学習に必要な把持特徴サンプルはサンプリングトリガの発生と同時に取得することができる。
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本発明では、詳細は後述するが、省電力を実現するために一定の条件を満たしたセンサを通電停止とし、休眠(スリープ)モードとする。このモードについて図5A,5B,5C,5Dを参照して詳細に説明する。図5A,5B,5C,5Dは全ての実施例に係る携帯端末500、500’の通電、通電停止の4つのモードパターンを模式的に例示する図であって、図5Aはアウェイク・モード、図5Bはパーシャル・スリープ・モード、図5Cはスリープ・モード、図5Dはアドバンスド・スリープ・モードの例を示している。図5A~5Dにおけるブロック511~516は図3Aの加速度センサ511、ジャイロスコープ512、マイクロホン513、環境光センサ514、位置情報センサ515、アプリセンサ516をシンボルとして表し、図5A~5Cにおけるブロック520~550、555、560~590は後述の図9における圧力センサアレイ520、把持特徴サンプル取得部530、端末状態検知部540、テンプレート選択部550、テンプレート記憶部555、本人認証部560、本人レベル監視部570、電源制御部580、端末ロック部590をシンボルとして表している。また、図5Dにおけるブロック520,530,550,560,590は図5A~5Cにおける対応するものと同じであり、図5Dにおけるブロック540’、570’、580’は後述の図11における端末状態検知部540’、本人レベル監視部570’、電源制御部580’をシンボルとして表している。
図6を参照してパーシャル・スリープ・モード、スリープ・モードにおいて使用する本人認証テンプレートについて詳細に説明する。図6は全ての実施例に係る携帯端末500、500’の各環境状態に適合する本人認証テンプレートを例示する図である。図6に示すように、例えばスリープ・モードにある場合には全てのセンサの通電が停止されているため、環境信号は全く出力されず、携帯端末500、500’がどのような環境状態にあるのか全く手掛かりがない状態となる。この時に使用する本人認証テンプレートを「本人認証テンプレート*-*-*-*-*」と定義する。本人認証テンプレート*-*-*-*-*としては具体的には以下のようなものが考えられる。
次に、本発明の携帯端末500、500’が用いる本人レベルについて詳細に説明する。本人レベルは本発明の携帯端末500、500’による本人認証が成功すれば増加し、失敗すれば減少することを特徴とする。本人レベルとしては、例えば直近N回(Nは1以上の整数)の本人認証における認証成功率を用いることができる。認証回数は一定時間携帯端末500、500’が把持されていない状態が継続した場合にリセットされるものとする。認証回数がN回よりも少ない状態では、全ての認証回数における認証成功率を用いる。このため、認証回数が少ないうちは本人レベルの変動幅が大きいが、認証回数が多くなるにつれ、認証成功率が安定する。Nが小さすぎると認証成功率の変動が激しすぎて実用に適さない。またNが大きすぎると、直近の認証成功率の変化に対して鈍感な指標となってしまうので、これも実用に適さない。従ってNとしては大体20~30程度とすることが望ましい。本人レベルとしては、上述の認証成功率に限らず、認証成功回数の合計を用いることもできる。この場合、認証成功回数が予め定めた上限に達した場合には、その後の認証成功については加算を行わないようにして、ある一定の値で本人レベルが飽和するように設計することが望ましい。
Claims (11)
- 自身が把持されたときの把持特徴サンプルを取得して本人認証を行う移動情報端末であって、
前記把持特徴サンプルを取得する把持特徴サンプル取得部と、
前記移動情報端末が属する環境情報を取得して、環境信号を出力するセンサを1以上備える環境センサ群と、
前記環境信号を取得して前記移動情報端末の1つ以上の端末状態の組を環境状態として検知する端末状態検知部と、
前記各環境状態に適合する本人認証テンプレートを記憶するテンプレート記憶部と、
前記検知された環境状態を取得して、当該環境状態に適合する本人認証テンプレートを選択するテンプレート選択部と、
前記取得された把持特徴サンプルと前記選択された本人認証テンプレートとを照合して本人認証を行い、当該本人認証結果を出力する本人認証部と、
前記本人認証結果を取得して、当該本人認証結果に応じて変化する本人レベルが各センサに対応して予め定めたしきい値を超えて変化した場合には、センサ電源OFF信号を出力し、前記本人レベルが前記しきい値を下回る変化をした場合には、センサ電源ON信号を出力するよう構成された本人レベル監視部と、
前記センサ電源OFF信号を取得した場合には前記しきい値と対応するセンサを通電停止し、前記センサ電源ON信号を取得した場合には前記しきい値と対応するセンサを通電する電源制御部と
を含む移動情報端末。 - 請求項1に記載の移動情報端末は端末ロック部をさらに含み、
前記本人レベル監視部は、前記本人レベルが予め定めた本人閾値を下回る変化をした場合には端末ロック信号を出力するよう構成されており、
前記端末ロック部が、前記端末ロック信号を取得した場合には前記移動情報端末をロックするよう構成されている。 - 請求項1又は2に記載の移動情報端末であって、
前記本人レベル監視部は、前記本人レベルが予め定めた認証休止閾値を超えて変化した場合には認証休止信号を出力するよう構成されており、
前記電源制御部は、前記認証休止信号を取得した場合には前記把持特徴サンプル取得部、前記テンプレート記憶部、前記テンプレート選択部、前記本人認証部、前記本人レベル監視部のうち少なくとも1つを通電停止するよう構成されている。 - 請求項3に記載の移動情報端末であって、
前記電源制御部は、前記把持特徴サンプル取得部、前記テンプレート記憶部、前記テンプレート選択部、前記本人認証部、前記本人レベル監視部のうち少なくとも1つを通電停止した場合に、前記環境センサ群が備えるセンサのうちの一つを通電状態とし、前記通電状態のセンサが出力する環境信号に一定値以上の変位があった場合に、前記把持特徴サンプル取得部、前記テンプレート記憶部、前記テンプレート選択部、前記本人認証部、前記本人レベル監視部に通電するよう構成されている。 - 請求項1から4の何れかに記載の移動情報端末であって、
前記環境センサ群は少なくとも前記移動情報端末のアプリケーション起動状況を前記環境情報の一部として取得するアプリセンサと、前記移動情報端末に加えられている加速度を前記環境情報の一部として検知する加速度センサとを含む。 - 移動情報端末が把持されたときの把持特徴サンプルを取得して本人認証を行う把持特徴認証方法であって、
前記把持特徴サンプルを取得する把持特徴サンプル取得ステップと、
前記移動情報端末が属する環境情報を取得して環境信号を出力するセンサを1以上備える環境センサ群から、環境信号を取得して前記移動情報端末の1つ以上の端末状態の組を環境状態として検知する端末状態検知ステップと、
前記検知された環境状態を取得して、当該環境状態に適合する本人認証テンプレートをテンプレート記憶部に記憶された本人認証テンプレートから選択するテンプレート選択ステップと、
前記取得された把持特徴サンプルと前記選択された本人認証テンプレートとを照合して本人認証を行い、当該本人認証結果を出力する本人認証ステップと、
前記本人認証結果を取得して、当該本人認証結果に応じて変化する本人レベルが各センサに対応して予め定めたしきい値を超えて変化した場合には、センサ電源OFF信号を出力し、前記本人レベルが前記しきい値を下回る変化をした場合には、センサ電源ON信号を出力する本人レベル監視ステップと、
前記センサ電源OFF信号を取得した場合には前記しきい値と対応するセンサを通電停止し、前記センサ電源ON信号を取得した場合には前記しきい値と対応するセンサを通電する電源制御ステップと
を含む把持特徴認証方法。 - 請求項6に記載の把持特徴認証方法が端末ロックステップをさらに有し、
前記本人レベル監視ステップは、前記本人レベルが予め定めた本人閾値を下回る変化をした場合には端末ロック信号を出力し、
前記端末ロックステップは、前記端末ロック信号を取得した場合には前記移動情報端末をロックする。 - 請求項6又は7に記載の把持特徴認証方法であって、
前記本人レベル監視ステップは、前記本人レベルが予め定めた認証休止閾値を超えて変化した場合には認証休止信号を出力し、
前記電源制御ステップは、前記認証休止信号を取得した場合には前記把持特徴サンプル取得ステップ、前記テンプレート記憶ステップ、前記テンプレート選択ステップ、前記本人認証ステップ、前記本人レベル監視ステップを実行する回路のうち少なくとも1つを通電停止する。 - 請求項8に記載の把持特徴認証方法であって、
前記電源制御ステップは、前記把持特徴サンプル取得ステップ、前記テンプレート記憶ステップ、前記テンプレート選択ステップ、前記本人認証ステップ、前記本人レベル監視ステップを実行する回路のうち少なくとも1つを通電停止した場合に、前記環境センサ群が備えるセンサのうちの少なくとも一つを通電状態とし、前記通電状態のセンサが出力する環境信号に一定値以上の変位があった場合に、前記把持特徴サンプル取得ステップ、前記テンプレート記憶ステップ、前記テンプレート選択ステップ、前記本人認証ステップ、前記本人レベル監視ステップを実行する回路に通電する。 - 請求項6から9の何れかに記載の把持特徴認証方法であって、
前記環境センサ群は少なくとも前記移動情報端末のアプリケーション起動状況を取得するアプリセンサと、前記移動情報端末に加えられている加速度を検知する加速度センサとを備え、前記端末状態検知ステップは前記アプリケーション起動状況と上記加速度をそれぞれ前記環境情報の一部として検知する。 - 請求項6から10の何れかに記載の把持特徴認証方法を実行すべき指令をコンピュータに対してするプログラムを記録したコンピュータで読み取り可能な記録媒体。
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JP2015055947A (ja) * | 2013-09-11 | 2015-03-23 | 三菱電機株式会社 | 車両制御装置 |
KR101528236B1 (ko) * | 2014-03-06 | 2015-06-12 | 국립대학법인 울산과학기술대학교 산학협력단 | 단말의 휴대 방법에 관계 없이 사용자의 행동을 인지할 수 있는 방법 및 이를 지원하는 장치, 그리고 상기 방법을 실행하는 프로그램을 기록한 컴퓨터 판독 가능한 기록매체 |
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US20140007227A1 (en) | 2014-01-02 |
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JP5612756B2 (ja) | 2014-10-22 |
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