EP2137599A1 - Dispositif de mesure de pression et procédé correspondant - Google Patents

Dispositif de mesure de pression et procédé correspondant

Info

Publication number
EP2137599A1
EP2137599A1 EP08707099A EP08707099A EP2137599A1 EP 2137599 A1 EP2137599 A1 EP 2137599A1 EP 08707099 A EP08707099 A EP 08707099A EP 08707099 A EP08707099 A EP 08707099A EP 2137599 A1 EP2137599 A1 EP 2137599A1
Authority
EP
European Patent Office
Prior art keywords
module
data
measuring device
coordinate data
pressure measuring
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP08707099A
Other languages
German (de)
English (en)
Inventor
Marcel Jacomet
Lorenz Müller
Josef Goette
Roger Cattin
Andreas Eicher
Alain Rollier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AXSionics AG
Original Assignee
AXSionics AG
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.)
Filing date
Publication date
Application filed by AXSionics AG filed Critical AXSionics AG
Priority to EP08707099A priority Critical patent/EP2137599A1/fr
Publication of EP2137599A1 publication Critical patent/EP2137599A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1382—Detecting the live character of the finger, i.e. distinguishing from a fake or cadaver finger
    • G06V40/1394—Detecting the live character of the finger, i.e. distinguishing from a fake or cadaver finger using acquisition arrangements

Definitions

  • the invention relates to a device and a method for pressure measurement, wherein the pressure to be measured is exerted with an object on a contact surface of the pressure measuring device.
  • the invention relates to methods and devices for coordinate detection, navigation input, authentication of a user as well as for command and text input based on the pressure measuring device according to the invention.
  • this pressure measuring device is known in the prior art, which e.g. exploit the weight of the object or a reference object.
  • the beam weigher or tilt scale are devices that fall under this category of pressure measuring devices.
  • One of the disadvantages of the devices of the prior art is that area moment of inertia and moment of resistance of the material comprising the contact surface are usually suitable for measurement only in the area of linearly elastic deformations ("Hook's area”) abandoned or exceeded the force exerted, not only the problem arises that the pressure by means of the spring can no longer be measured correctly, but there is also the danger that the spring element deformed itself so that it has become useless for further pressure measurements and Piezo elements, on the other hand, have the disadvantage that they can be strongly influenced by external disturbances.Piezo elements are also subject to certain production fluctuations, which can not be easily corrected by calibration.
  • European patent application EP 0'919'947 A2 shows in the prior art a contact-sensitive contact surface of a fingerprint sensor. It includes the
  • Kont ⁇ kt changeable capacities, which are formed by different mutually insulated material layers. For example, if a pressure is applied to the contact surface with a finger, the surface deforms corresponding to the elevations and depressions of the skin surface. This deformation of the contact surface causes a change in the electrostatic capacitances and can be made available and evaluated by means of detection electronics as an electrical signal.
  • US Pat. No. 4,394,773 shows a fingerprint sensor having a contact surface or sensor plate based on a piezoelectric material. With the finger pressure is exerted on the contact surface so electrical signals are generated by the piezorelectric material as a function of the pressure and can be evaluated accordingly by means of an electronic device.
  • both EP 0'919'947 and US Pat. No. 4,394,773 have the disadvantage that the surface of the sensors must be touch-sensitive. As a result, the electronic circuits underlying this surface are necessarily subjected to mechanical stress, which leads, for example, to signs of wear and severe aging.
  • the prior art also discloses various systems for authenticating a user by means of a fingerprint. That. Is, for example, the patent US 7 '190 * 816, a Authentizi fürsvon means of fingerprint.
  • the fingerprint is captured with a small fingerprint sensor as image data.
  • image data of a second fingerprint of the user are detected by means of the fingerprint sensor.
  • the image data of the first fingerprint is compared with the image data of the second fingerprint for correspondence.
  • a disadvantage of such a method is, for example, that authentication with copies of fingerprints, such as by means of a finger imaged by wax or gelatin, can be easily achieved in misleading or abusive ways by other users. The security of the authentication is thus not guaranteed in all cases.
  • Automatic authentication using fingerprint sensors is an integral part of many security systems.
  • fingerprint sensors are installed in laptops, in mobile phones, in portable security tokens or in computer mice, whereby the user gains access to specific applications by means of fingerprint authentication.
  • security tokens designed for miniaturization in which no physical keyboard is available, external influences can lead to the authentication process of the corresponding person failing, or at least making it more difficult.
  • aggravating influences can be, for example, dirt or sweat, which, when a body part contacts a sensor, leads to a disruption of the data acquisition.
  • changes in temperature or injuries, for example, a finger can partially adversely affect an authentication process.
  • Pressure measuring device should be applied to a contact surface by means of an object
  • the pressure measuring device should be mechanically easy to implement and maintain. In addition, it should be robust against environmental influences and guarantee high operational safety. Further, based on the described pressure measuring device, an authentication device based on biometric features is proposed, which includes the above-mentioned
  • a pressure measuring device force measured with a partial surface of an object on a contact surface of the pressure measuring device is measured and a corresponding pressure value parameter is generated
  • an image acquisition module comprising the Kont ⁇ kt Structure for detecting and storing image data of an elastically structured partial surface of the object comprises, wherein pixels of the sub-surface according to their distance from the contact surface as corresponding graded color and / or brightness values of the image data can be detected
  • the pressure measuring device an integration module with a corresponding
  • the stack memory comprises a readable stack memory height value
  • the pressure measuring device comprises a filter module for generating the pressure value parameters, wherein by means of the filter module, a pressure value parameter is assigned to the read out stack memory height value.
  • the contact surface can be immovable, rigid and / or rigid. Since the deformation of such a surface for pressure measurement is unnecessary, it is resistant to material fatigue and accordingly wear resistant.
  • Another advantage of the invention lies in the fact that the pressure measurement is measurable even in the non-linear region. Thus, for example, a pressure measurement is already successful with the least contact of the elastically structured surface of the object with the contact surface of the image acquisition module.
  • Another advantage of this device is that a pressure measurement, for example. Under water or in a vacuum is possible.
  • Another advantage of the invention lies in the fact that the pressure measurement can in principle be based on the same image data, which are also used for obtaining biometric features, for example for authentication. In addition, can be dispensed with additional components, such as piezoelectric elements.
  • the pressure measuring device can also generate x / y coordinate data directly by means of the image acquisition module and transmit it to further modules.
  • the filter module of the pressure measuring device comprises a lookup table
  • value pairs are stored in the lookup table, each comprising a reference value and a corresponding associated pressure value parameter
  • the filter module is a comparison module for comparing a stack memory height value transmitted to the comparison module with the reference values of the lookup table, wherein based on the comparison for generating the pressure value parameter by means of the lookup table, the corresponding pressure value parameter can be assigned.
  • the pressure value parameter is made available by the lookup table in the shortest possible time and can be read out immediately, since the pressure value parameter is not available before each Readout must be redetermined or calculated. Since complex calculations are eliminated, inexpensive and resource-saving storage components can be used.
  • a filter module of the pressure measuring device a correlation module for assigning a transferred to the correlation module stack memory altitude value to a pressure value based on at least one power and / or at least one multiplication and / or at least one Addition factor comprises, based on the correlation of the corresponding pressure value parameter can be generated.
  • a pressure value parameter corresponding to the correlation factors can be accurately calculated, the factors being changeable and adaptable as needed.
  • a further advantage of the invention is that the parameters for such a "fit function" can be adapted in accordance with the specific, elastically structured partial surface of an object which contacts the contact surface, so that individualized tuning of the pressure measurement is possible.
  • the pressure measuring device comprises an interface module for generating control signals and / or data signals based on the pressure value parameter.
  • control signals of the pressure measuring device can be transferred to other devices. These control signals serve, for example, to trigger an event.
  • data signals can be used, for example, to pass the pressure value to an output unit of the pressure measuring device, such as a display unit, wherein a pressure value, for example, in the units N / m 2 , Pascal, bar or atmosphere can be issued.
  • the interface module can also be designed as a bus or line system for exchanging data and / or control signals between potentially more than two users or modules.
  • the output unit can also be realized as an acoustic unit, such as a loudspeaker module.
  • the image acquisition module is a scan module with an optically transparent
  • Pressure measuring device for Pressure detection using simple technical means, for example, based on optical and / or capacitive detection and / or by means of a "Radio Frequency" sensor can measure pressure, wherein the image acquisition module, for example, a fingerprint sensor is in the RF sensor, for example, in a sensor
  • fingerprint sensors represent another possibility in addition to optical or capacitive technologies.
  • an object is therefore scanned, ie in a systematic, regular manner
  • pressure value parameters can be recorded simultaneously with biometric characteristics.
  • these objects are achieved by the invention in that by means of a calibrated second pressure measuring device the force executable by means of an elastically structured partial surface on the contact surface of a pressure measuring device is detected by means of an image acquisition module of the pressure measuring device by means of image data of the elastically structured partial surface of the object Distance to the contact surface as correspondingly graduated color and / or brightness values are detected, that a stack of an integration module of the pressure measuring device, based on the color and / or brightness values of the image data, is incremented, wherein by means of a filter module based on the stack memory height value generates a corresponding pressure value parameter is that the stack height value and the associated pressure value parameter are transmitted as a pair of values in the lookup table and / or or as calibration values pair are transferred to the correlation module of the pressure measuring device.
  • the pressure value parameters determined by means of the calibrated second pressure measuring device correspond to absolute pressure values. These can either be stored as calibration value pairs in a lookup table or be defined by means of a suitably coordinated correlation function. A calibration of the pressure measurement parameters is also individually, for example, per user feasible.
  • a coordinate detection device generates a contact-sensitive contact surface for detecting planar x / y coordinate data of a partial surface of an object contacting the contact surface and a coordinate detection module for generating Corresponding Sign ⁇ ld ⁇ ten umf ⁇ that the contact surface is part of a Druckmessvorricht ⁇ ng, wherein upon contact of the contact surface with an elastically structured partial surface of an object by means of the pressure measuring device, a corresponding pressure value parameter is generated that the coordinate detection device comprises a filter module for generating z-coordinate data as a function of the pressure value parameter, wherein by means of the filter module each z-coordinate data corresponding to each possible pressure value parameter can be assigned, that the coordinate detection device comprises a coordinate detection module for generating corresponding signal data as 3D coordinate data based on the z-coordinate data and the x / y coordinate data acquired by means of an image acquisition module of the pressure measurement device.
  • the coordinate detection device comprises an interface module for generating control signals and / or data signals based on the SD coordinate data.
  • the interface module can i.a. be executed as a bus and / or parallel and / or serial interface.
  • the filter module of the coordinate detection device has a
  • Lookup table wherein in the lookup table value pairs are stored, each comprising a reference value and a corresponding associated pressure value parameter, and that the filter module is a comparison module for Comparing a stack memory height value transferred to the comparison module with the reference values of the lookup table, wherein based on the comparison for generating the z coordinate data by means of the lookup table, the corresponding z coordinate data can be assigned.
  • the filter module of the coordinate detection device has a correlation module for assigning a stack memory height value transmitted to the correlation module to the corresponding z coordinate data based on at least one power and / or at least one multiplication and / or or at least one addition factor the corresponding z-coordinate data can be generated.
  • a correlation module for assigning a stack memory height value transmitted to the correlation module to the corresponding z coordinate data based on at least one power and / or at least one multiplication and / or or at least one addition factor the corresponding z-coordinate data can be generated.
  • Such Ausf ⁇ hrungssection has the advantage that an exact correlation * • between the corresponding z-coordinate data and pressure value parameters is possible by means of the correlation module.
  • the correlation module may be implemented in hardware and / or software.
  • Navigation input device planar x / y coordinate data of the contact surface touching part surface of an object are detected and generate a coordinate detection module and a timer module to the corresponding time-dependent signal data that the pressure measuring device comprises a timer and / or scheduler module for generating at least one time base and / or corresponding time value parameters in that planar x / y coordinate data can be detected by means of the image acquisition module of the pressure measuring device, in that the navigation input device comprises an adding module for adding SD coordinate data and time value parameters and generating corresponding time-dependent 3D coordinate data.
  • This has u.a. the advantage that by means of the navigation input device navigation on the basis of four dimensions x, y, z and t is possible. For example.
  • the sequence of 3D coordinate data can be traced within a certain time by means of the navigation input device.
  • Control signals and / or data signals based on the time-dependent 3D coordinate data Such a variant has the advantage that the time-dependent 3D coordinate data can be transmitted, inter alia, via a bus and / or a line system to a display module or that the data for further processing to a processor system or in a memory are transmitted.
  • the objects are achieved by the invention also by means of an authentication device, a user is authenticated, wherein identified stored image data as a reference image data of a fingerprint or a portion thereof with image data to be identified another fingerprint or a portion thereof are comparable, wherein in dependence
  • a corresponding authentication parameter can be generated such that the pressure value parameter detected by the pressure measuring device can be correspondingly assigned to the image data of the identified first image, the pressure value parameter detected by the pressure measurement device can be correspondingly assigned to the image data of the further image
  • the authentication device is a filter module for generating the authentication parameter based on the Correspondence of the corresponding pressure value parameters and depending on the agreement of the identified Includes image data with the image data of the further image. This has u.a.
  • the advantage that in the identification by means of image data of a fingerprint can be additionally checked whether the contact surface touching object corresponds to a fingerprint of a person or if only a copy of a fingerprint has been applied to the contact surface.
  • the copy lacks, for example, on a paper or a film, the corresponding property of elasticity, so that the structure does not significantly change depending on the force applied to the contact surface.
  • the pressure value parameter would change imperceptibly or not at all during an authentication process.
  • this device leads to increased authentication security.
  • a filter module of the authentication device comprises a lookup table
  • value pairs are stored in the lookup table, each comprising a reference value and a corresponding associated pressure value parameter
  • the filter module Comparison module for comparing a transferred to the comparison module stack memory height value with the reference values of the lookup table, wherein based on the comparison for generating the authentication parameter using the lookup table, the corresponding authentication parameter can be assigned.
  • a user can be authenticated by means of an authentication device, where identified time-dependent x / y coordinate data of a partial surface of an object which touches a contact-sensitive contact surface can be compared with x / y coordinate data to be identified, and Means for generating corresponding authentication parameters, characterized in that the contact surface is part of a navigation input device, wherein upon contact of the contact surface with an elastically structured partial surface of the object by means of the navigation input device corresponding time-dependent 3D coordinate data can be generated that the authentication device comprises means for storing time-dependent 3D Coordinate data as signature data comprises that the authentication device is a filter module for generating the Authentifizi tion parameters based on the comparison of the signature data with the detected time-dependent 3D coordinate data includes.
  • the signature may be a signature, a geometric figure, and the like.
  • a signature is characterized by capturing and storing x, y, z coordinate data along the path of the signature.
  • a time value parameter can be assigned to the SD coordinate data. The finger can be guided during the detection of the signature on the narrow fingerprint sensor, so that only minor movements are necessary.
  • these objects are achieved by the invention by assigning user-specific image data of a fingerprint and / or a sub-surface of an object by means of the signature authentication method to a multiplicity of the acquired coordinate data, such that the acquired image data are compared with the identified reference image data Comparison corresponding authentication parameters are generated.
  • the image data captured by means of the image acquisition module can also be used for authentication by means of a fingerprint, so that a combination of authentication by means of a fingerprint and authentication by means of signature is possible.
  • the authentication device comprises an interface module for generating control signals and / or data signals based on the at least one authentication parameter.
  • Such an embodiment variant has the advantage that authentication parameters can be transmitted to other modules in a corresponding manner as control signals and / or data signals by means of the interface module.
  • the interface module can be designed, inter alia, as a bus and / or parallel and / or serial interface.
  • the authentication device comprises means for determining
  • Sub-areas of sub-surfaces of an object includes that
  • Authentication device comprises means for comparing to match at least two sub-areas.
  • Such an embodiment variant has the advantage that only small areas of a partial surface of an object, for example a fingertip, have to be detected by means of the authentication device. The authentication process can thereby be accelerated.
  • the objects of the invention are also achieved by comparing planar coordinate data stored with a command input data as a specified command pattern data with x / y coordinate data of a touch surface contacting and passing over a touch surface, and including means for generating corresponding command parameters; in that the contact surface is part of a pressure measuring device such that planar coordinate data can be detected by means of an image acquisition module of the pressure measuring device, that the command input device comprises a filter module for assigning corresponding pressure value parameters to a plurality of the planar coordinate data, that the command input device is a filter module for generating the command parameter based on the comparison of the planar coordinate data u and / or the pressure value parameters of the specified command pattern data with the acquired planar coordinate data and / or the pressure value parameters comprises that the command input device comprises an interface module for generating control signals and / or data signals based on the at least one command parameter.
  • the objects are also achieved by the invention in that at least one character is selectable from a plurality of characters that can be displayed on a display module by interacting with an object and an input unit, wherein a cursor element is positioned on the display module by the interaction, wherein based on the position of the cursor element, the character is selected and a data signal is generated and transmitted, that the input unit is realized as the contact surface of a pressure measuring device with an image acquisition module, wherein planar coordinate data is detected by means of the pressure measurement device, that corresponding pressure value parameters are detected by the pressure measurement device, wherein, depending on the x / y coordinate data, the cursor element is positioned on the character to be selected, that the character selects the selected character based on the pressure value parameter generated by the pressure measuring device ird and that the data signal is generated and transmitted by means of a filter module of the pressure measuring device based on the selected character.
  • the display module displays numbers from 0 to 9, a "Clear” or “Clear” sign, a "Confirm Input” or “Enter” sign, and a cursor element
  • the user can place a finger on the image capture module Depending on the x / y position of his finger on the contact surface position the cursor element on the character to be selected and select by pressing the finger on the contact surface the corresponding character.
  • PIN personal identification number
  • the objects are also achieved by the invention in that at least one character is selectable from a plurality of characters that can be displayed on a display module by interacting with an object and an input unit, wherein a cursor element is positioned on the display module by the interaction, wherein based on the position of the cursor element selects the character and a data signal is generated and transmitted that the input unit as a contact surface a pressure measuring device is realized with a Bilderf ⁇ ssungsmoduls, wherein by means of the pressure measuring device planar coordinate data are detected that corresponding pressure value parameters are detected by the pressure measuring device, wherein the cursor element is positioned on the character to be selected depending on the pressure value parameter that the character based on the means Pressure measuring device generated x / y coordinate data, the selected character is selected and that by means of a filter module of the pressure measuring device based on the selected character, the data signal is generated and transmitted.
  • FIG. 1 shows a schematic representation of a pressure measuring device
  • FIG. 2 shows a schematic representation of a coordinate detection device
  • FIG. 3 shows a schematic representation of a navigation input device
  • FIG. 4 shows a schematic representation of an authentication device
  • Figure 5 is a schematic representation of a command input device
  • FIG. 6 shows a schematic representation of a functional dependency of pressure value parameter to stack memory height value
  • FIG. 7a shows a schematic illustration of a subset of pixels of an elastically structured partial surface of an object contacting a contact surface with a small force exerted by the object on the contact surface;
  • FIG. 7b shows a schematic representation of a subset of pixels of an elastically structured partial surface of an object contacting a contact surface with increased application of force of the object to the contact surface
  • FIG. 8a shows a schematic representation of a display unit for the output of characters in matrix representation and the interaction of a user by means of his finger on an input unit
  • Figure 8b shows a schematic representation of a display unit for outputting characters in Wheels-type representation
  • Figure 9 shows a schematic representation of a Papillarang and a corresponding Hilfsmitassung.
  • FIG. 1 illustrates a device that can be used to implement the pressure measuring device according to the invention.
  • Figure 1 shows a schematic representation of an inventive device for measuring pressure. With a partial surface of an object 7, a force is exerted on a contact surface 11 of the pressure measuring device 1 and corresponding pressure value parameters are generated.
  • Reference numeral 7 refers to an object such as a finger or other human body part. This object 7 is characterized in particular in that at least a part of the surface of the object 7 is structured elastically.
  • the reference numeral 71 refers to the surface of the object 7.
  • the reference numeral 71 1 refers to a partial surface or a partial region of this surface 71.
  • the structures of the partial surface 71 1 may include patterns, arcs and loops with elevations and depressions of the surface.
  • Such structures of subregions 71 1 of, for example, a fingertip or a palm are used, for example, in the dactyloscopy for the recognition of persons.
  • dactyloscopy for example, papillary borders in the palms of the hands and feet can be examined.
  • Such structures are usually at least partially elastic.
  • One of the features of elastic objects or bodies is, among other things, that they change their shape under the action of force and return to the original form when the force acting on them disappears.
  • the elastically structured partial surface 71 1 is guided on a designated by reference numeral 1 1 1 contact surface.
  • Such a contact surface 1 1 1 may be rigid.
  • the contact surface 1 1 1 can be designed as an optically transparent and / or sound waves transparent contact surface.
  • the contact surface 1 1 1 is part of an image acquisition module 1 1.
  • the image acquisition module 1 1 comprises a scan module with an optically transparent contact surface 1 1 1 and / or a scan module with capacitive and / or RF sensors. In this case, pixels of the partial surface 71 1 can be detected according to their distance from the contact surface 11 as correspondingly graduated color and / or brightness values of the image data.
  • the image acquisition module can be designed as a fingerprint sensor.
  • the image acquisition module 11 may detect x / y coordinate data of an object touching the contact surface, for example as position data with respect to the dimensions or the pixel resolution of the contact surface.
  • the reference numeral 14 refers to a memory module in which these image data are stored and read out again at a later time.
  • the memory module can be embodied, for example, as RAM, flash, hard disk or the like.
  • Figure 7a shows more brighter pixels, with Figure 7b showing more darker pixels.
  • FIG. 7a shows more brighter pixels, with Figure 7b showing more darker pixels.
  • FIG. 7a shows more brighter pixels, with Figure 7b showing more darker pixels.
  • FIG. 7a shows more brighter pixels, with Figure 7b showing more darker pixels.
  • FIG. 7b shows one with an increased application of force of the object 7 to the contact surface 11 1.
  • These pixels 1 1 1 1 to 1 1 19 show only a selection of possible pixels of a contact surface 11 1.
  • the image acquisition module 11 thus scans an "image
  • the pressure-measuring device 1 may, for example, comprise means for selecting partial regions of this image, so that an respectively identical partial region can be determined by images acquired sequentially by the image acquisition module 11 can also comprise means for connecting partial areas of a partial surface 71 1 of an object
  • the determination of a pressure value parameter is functionally related to the detected color and / or brightness values of the pixels a subarea ndenen color and / or brightness values are summed by means of an incremental stack.
  • a further determination of a pressure value parameter can be achieved, for example, by determining the width of a widening ridge by means of a geometric calculation which, based on the 9 shows the following calculation (h corresponds to the width of a papillary strip, m v corresponds to the height of a papillary strip in the vertical direction, rrih the width of a papillary strip in the horizontal direction, a and b are auxiliary variables):
  • a pressure value parameter can, for example, also be determined on the basis of frequencies of color and / or brightness values of the pixels of a subregion of a sub-surface 71 1.
  • fingerprint sensors are known which provide the abovementioned frequencies as a so-called pixel histogram.
  • a threshold value can be used to determine the pressure value parameter, so that, for example, a key signal can be generated.
  • p P h corresponds to a resulting pressure value indicator, th to a threshold value and k to a count variable to form a total
  • the calculation can also be represented as a division of the sum of all the color and / or brightness values of "darker" pixels or "Pixel” with the sum of the color and / or brightness values of the "brighter” pixels or "pixels", wherein the pixels have been determined, for example, by means of a fingerprint sensor:
  • the determination of the Druckwertp ⁇ r ⁇ meters can be executed in software and / or hardware.
  • the filter module denoted by reference numeral 13 may comprise a lookup table, wherein in the lookup table value pairs are stored, each comprising a reference value and a correspondingly assigned pressure value parameter.
  • the filter module 13 may comprise a comparison module for comparing a stack memory height value transmitted to the comparison module with the reference values of the lookup table, wherein the corresponding pressure value parameter can be assigned based on the comparison for generating the pressure value parameter by means of the lookup table.
  • the filter module 13 can also comprise a correlation module for assigning a stack memory height value transmitted to the correlation module to a pressure value based on at least one power and / or at least one multiplication and / or at least one addition factor, wherein the corresponding pressure value parameter can be generated based on the correlation ,
  • This correlation module may, for example, be implemented as a "fit function" hardware and / or software
  • the pressure measuring device 1 may comprise a processor, which in particular can calculate and execute the acquisition and storage of image data, the calculation of the pressure value parameter and filter functions
  • the memory module 14 may be integrated
  • the pressure measuring device may include an interface module 19 for generating control signals and / or data signals based on the pressure value parameter.
  • the reference numeral 2 designates the coordinate detection device according to the invention.
  • the coordinate detection device comprises a contact-sensitive contact surface 1 1 1 for detecting planar x / y coordinate data of a contact surface contacting partial surface of an object 7. It also includes a coordinate detection module 22 for generating corresponding signal data.
  • the x / y coordinate data is acquired by the image acquisition module 11 and transmitted to the coordinate acquisition module 22.
  • the contact surface 1 1 1 is part of a pressure measuring device 1. When touching the contact surface 1 1 1 with an elastically structured part surface 71 1 of an object 7 by means of the pressure measuring device 1 is a corresponding pressure value parameter generierb ⁇ r.
  • the coordinating device 2 comprises a filter module 21 for generating z-coordinate values as a function of the pressure value parameter, it being possible to assign z coordinate data corresponding to any possible pressure value parameter by means of the filter module.
  • the coordinate detection device 2 includes a coordinate detection module 23 for generating corresponding signal data as SD coordinate data based on the z-coordinate data and the x / y coordinate data acquired by an image acquisition module 1 1 of the pressure measurement device 1.
  • the reference numeral 3 refers to the navigation input device according to the invention.
  • the navigation input device comprises a contact-sensitive contact surface 1 1 1 for detecting planar x / y coordinate data of a partial surface of an object 7 contacting the contact surface and a coordinate detection module 22 and a timer module for generating corresponding time-dependent signal data.
  • the pressure measuring device 1 comprises a timer and / or scheduler module 15 for generating at least one time base and / or corresponding time value parameters. By means of image acquisition module 1 1 of the pressure measuring device 1 planar x / y coordinate data can be detected.
  • the navigation input device 3 includes an adding module 31 for adding SD coordinate data and time value parameters and generating corresponding time-dependent 3D coordinate data.
  • the navigation input device 3 comprises an interface module 19 for generating control signals and / or data signals based on the time-dependent 3D coordinate data, such that x, y, z coordinate data and pressure value parameter p and time value parameter t x . y and t P are available.
  • the reference numeral 4 refers to the inventive authentication device for authenticating a user.
  • identified stored image data 42 of a fingerprint are to be identified
  • a corresponding authentication parameter can be generated.
  • the pressure value parameter detected by means of the pressure measuring device 1 can be correspondingly assigned to the image data of the identified first image.
  • the authentication device 4 comprises a filter module 41 for
  • the authentication device comprises means for generating corresponding authentication parameters.
  • the contact surface 1 1 1 is part of a navigation input device 3, wherein upon contact of the contact surface 1 1 1 with an elastically structured sub-surface 71 1 of the object 7 by means of the navigation input device 3 corresponding time-dependent 3D coordinate data can be generated.
  • the authentication device 4 comprises means for storing 42 time-dependent 3D coordinate data as signature data.
  • the authentication device 4 comprises a filter module 41 for generating the authentication parameter based on the comparison of the signature data with the acquired time-dependent 3D coordinate data.
  • the filter module 41 of the authentication device 4 comprises a lookup table, wherein pairs of values are stored in the lookup table, each comprising a reference value and a correspondingly assigned pressure value parameter.
  • the filter module 41 comprises a comparison module for comparing a stack memory height value transmitted to the comparison module with the reference values of the lookup table, wherein based on the comparison for generating the authentication parameter by means of the lookup table, the corresponding authentication parameter can be assigned.
  • the authentication device 4 comprises an interface module 19 for generating control signals and / or data signals based on the at least one authentication parameter.
  • the authentication device 4 comprises means for determining partial areas 71 1 1 of partial surfaces 71 1 of an object 7.
  • the authentication device 4 comprises means for matching at least two partial areas 71 1 1.
  • the reference numeral 5 refers to the command input device according to the present invention, wherein planar coordinate data stored as specified command pattern data is comparable to x / y coordinate data of a partial surface of an object 7 contacting a touch-sensitive contact surface 11.
  • the command input device 5 comprises means for generating corresponding command parameters.
  • the contact surface 1 1 1 is part of a pressure measuring device 1.
  • Planar coordinate data can be detected by means of an image acquisition module 1 1 of the pressure measuring device 1.
  • corresponding pressure value parameters can be detected.
  • the command input device 5 comprises a filter module for assigning corresponding ones Pressure value p ⁇ r ⁇ meter to a variety of planar coordinate data.
  • the command input device 5 comprises a filter module 51 for generating the command parameter based on the comparison of the planar coordinate data and / or the pressure value parameters of the specified command pattern data with the acquired planar coordinate data and / or the pressure value parameters.
  • the command input device 5 comprises an interface module 19 for generating control signals and / or data signals based on the at least one command parameter.
  • the reference numeral 71 1 1 refers to partial areas of a partial surface 71 1 of an object 7.
  • a partial surface 71 1 1 can have several partial areas
  • 71 1 1 include. Subareas 71 1 1 may overlap each other. The
  • Reference numeral 9 shows a pressure indicator as a function of a reference value 8, for example a stack memory height value. This dependence can be linear or non-linear and, for example, be described in one function.
  • the pressure indicator or pressure value can also be correlated to a reference value.
  • the reference numerals 1 1 1 1 to 1 1 19 refer to pixels of a partial surface 71 1 of an object 7.
  • the pixels can be detected and stored as image data by means of the image acquisition module 1 1 of the pressure measuring device 1.
  • the color and / or brightness values of the pixels correspond to the distance of the elastically structured object surface, which comes into contact with the contact surface 11 of the image acquisition module 11. The darker a pixel is, the closer the object surface lies on the contact surface 11.
  • the reference numeral 183 refers to a display module, which is designed, for example, as a screen or LCD display, wherein characters such as, for example, a personal identification number (PIN) can be displayed.
  • the pressure measuring device 1 may, for example, provide means for the purpose of displaying an input of a PIN designated by reference numeral 185, wherein the available characters are arranged as a virtual keyboard, for example in a matrix.
  • a cursor element 14 can be controlled such that a specific character, a deletion function 183 or an input confirmation function 182 can be selected.
  • a confirmation and / or "click" signal may be generated with the selected character selected or accepted Character and leads the cursor element by means of his finger 7 on the character to be selected.
  • reference numeral 18 refers to a display module.
  • Reference numeral 184 denotes a cursor element.
  • Reference numeral 185 refers to a personal identification number (PIN) or string.
  • Reference numeral 186 denotes an arrangement of characters and / or numbers on a line, preferably on a line closed in a circle. The selection of a character takes place in that an object 7 is guided over the contact surface 1 1 1. Depending on the x / y coordinate data determined by means of the image acquisition module 1 1 of the pressure measuring device 1, the characters on the line are passed past a cursor element. The selection of the desired character takes place in that a pressure value parameter is generated by means of the pressure measuring device 1 and a selection signal is generated when a specific limit value is reached.
  • a corresponding one of the plurality of characters can also be selected. This happens, for example, in that, based on the height of the pressure value parameter, the characters arranged on a virtual line are passed past the cursor element 184.
  • the selection of the desired character takes place on the basis of the x / y coordinate data of the pressure-measuring device of an object 7 guided over the contact surface 11 to perform a characteristic selection movement.
  • Another way of character input is, for example, realized by the higher-order digits and special characters (delete, enter) are selected with higher pressure. With lower pressure, the lower-order numbers are selected.
  • the selection of the character takes place by briefly releasing the finger from the contact surface 1 1 1.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Computer Hardware Design (AREA)
  • Software Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Collating Specific Patterns (AREA)
  • Position Input By Displaying (AREA)

Abstract

Dispositif de mesure de pression (1) et procédé de mesure de pression selon lequel la pression à mesurer est exercée à l'aide d'un objet (1) sur une surface de contact (111) du dispositif de mesure de pression (1). Ledit dispositif de mesure de pression (1) comporte un module de prise d'images (11) pourvu de la surface de contact (111), des données d'images d'une partie (711) de la surface de l'objet (7) à structure élastique étant recueillies. La pression est déterminée et affichée en fonction des valeurs de coloration et / ou de luminosité de données d'images sélectivement recueillies. La présente invention concerne en particulier des procédés reposant sur l'utilisation du dispositif de mesure de pression (1) décrit et des dispositifs de détection de coordonnées (2), de saisie de données de navigation (3), d'authentification (4) d'un utilisateur ainsi que de saisie d'instruction (5) et de texte.
EP08707099A 2007-03-14 2008-01-17 Dispositif de mesure de pression et procédé correspondant Withdrawn EP2137599A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08707099A EP2137599A1 (fr) 2007-03-14 2008-01-17 Dispositif de mesure de pression et procédé correspondant

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07005268 2007-03-14
EP08707099A EP2137599A1 (fr) 2007-03-14 2008-01-17 Dispositif de mesure de pression et procédé correspondant
PCT/EP2008/000334 WO2008110227A1 (fr) 2007-03-14 2008-01-17 Dispositif de mesure de pression et procédé correspondant

Publications (1)

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EP2137599A1 true EP2137599A1 (fr) 2009-12-30

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US (1) US20100066697A1 (fr)
EP (1) EP2137599A1 (fr)
WO (1) WO2008110227A1 (fr)

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