WO2002037402A1 - Procede et dispositif pour identifier des objets a tester - Google Patents

Procede et dispositif pour identifier des objets a tester Download PDF

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Publication number
WO2002037402A1
WO2002037402A1 PCT/IB2001/002490 IB0102490W WO0237402A1 WO 2002037402 A1 WO2002037402 A1 WO 2002037402A1 IB 0102490 W IB0102490 W IB 0102490W WO 0237402 A1 WO0237402 A1 WO 0237402A1
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WO
WIPO (PCT)
Prior art keywords
sensor
test object
ultrasonic waves
chip
identification
Prior art date
Application number
PCT/IB2001/002490
Other languages
German (de)
English (en)
Inventor
Hermann Stockburger
Original Assignee
Stockburger, Andreas
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 Stockburger, Andreas filed Critical Stockburger, Andreas
Priority to AU2002222356A priority Critical patent/AU2002222356A1/en
Publication of WO2002037402A1 publication Critical patent/WO2002037402A1/fr

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/20—Individual registration on entry or exit involving the use of a pass
    • G07C9/22—Individual registration on entry or exit involving the use of a pass in combination with an identity check of the pass holder
    • G07C9/25—Individual registration on entry or exit involving the use of a pass in combination with an identity check of the pass holder using biometric data, e.g. fingerprints, iris scans or voice recognition
    • G07C9/257—Individual registration on entry or exit involving the use of a pass in combination with an identity check of the pass holder using biometric data, e.g. fingerprints, iris scans or voice recognition electronically
    • 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
    • G06V40/13—Sensors therefor
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing

Definitions

  • the invention relates to methods for assigning an identity to a test object with a sensor arranged permanently or temporarily on the test object with an adaptation surface to which the test object is adapted.
  • the invention also relates to devices or systems for performing these methods.
  • test objects has long been indispensable due to the increasing importance of security aspects at all levels of human activity. This applies above all where there are human-machine interfaces.
  • object identification is particularly important in connection with so-called chip cards or other shaped mobile objects, which e.g. machine readable and / or machine testable, i.e. also intelligent or capable of communication, e.g. as legitimation and / or data carrier,
  • EP-A-402779 describes a method for determining and / or identifying surface structures and near-surface structures of an object, in which the object lying on a flat or curved surface is irradiated by ultrasound waves and the waves reflected and scattered on the object are recorded by an ultrasound receiver.
  • a box filled with liquid or a solid medium has a support surface for the object on one side wall and one or more piezoelectric ceramic ultrasound transmitters and receivers arranged in its interior. Because of its design features, this system is unsuitable for widespread use in the area of identification using chip cards.
  • an identification system in which a test object, for example a human fingertip, is irradiated with ultrasound waves and a layer or surface deformed by the reflected or backscattered waves or set in corresponding vibrations by irradiation with electromagnetic waves, e.g. optically scanned and thus the presence of features in the test object is determined.
  • This system could theoretically meet the requirements for security against counterfeiting, misuse and data protection.
  • the system can only be used in very specific configurations and for a number of the most important applications, e.g. Verification in connection with chip cards cannot be implemented specifically enough.
  • the object of the invention is therefore to provide a method and a device for assigning an identity to a test object, which together optimally meet the currently known security requirements.
  • this is achieved by a method of the type mentioned in the introduction, in which the sensor for generation is excited by ultrasonic waves and their radiation into the test object, vibrations which are generated by backscattered ultrasonic waves in the sensor are converted into output signals which contain identification information about the system consisting of the test object and sensor.
  • the senor is a solid body with a crystal structure acting as a line or phase grating, in which an acoustic excitation signal is generated from one surface position and an acoustic echo signal is sampled at a second surface position, which contains information about the solid body and contains additional information about the test object, the solid being excited at said second surface position with the time-reversed echo signal.
  • the method is used to assign a clear and forgery-proof identity to individual animals in a herd and to subsequently identify the individual animals, and is characterized in that a biometric sensor on the animal is used to permanently record the epithelial structure of the skin in the area of the attachment point is arranged, the sensor is excited by a signal to generate an ultrasonic wave and its radiation into the skin, the backscatter modulated by the epithelial structure is received by the sensor and converted into an output signal which contains information about features of the individual epithelial structure of the animal and the output signal of the sensor is recorded and processed or stored by means of a reading device.
  • the method according to the invention serves for the unambiguous assignment of samples taken from a living being for diagnostic purposes. For this purpose, carriers or containers for samples which are taken from the living being for diagnostic purposes are provided with the identity information of the living being.
  • a preferred embodiment of a device according to the invention is a sensor which is characterized by a solid body with a crystal lattice structure acting as a line or phase lattice with an adaptation surface for adapting a test object.
  • a system for carrying out animal identification comprises a biometric sensor which can be fixedly attached to the animal and a reading device for exciting the sensor and for detecting the output signal sent by the sensor.
  • the reader is provided with a further biometric sensor for identification and authentication of the system user based on the same principle.
  • Fig. 1 is a schematic representation of the basic elements of an identification system according to the invention
  • Fig. 2 is a schematic representation of the structure and function of an identification system 3 shows a semiconductor chip with, for example, scanning structures
  • FIG. 4 shows a modified structure of a sensor arrangement suitable for the system.
  • FIG. 5 shows a plan view of a silicon chip
  • FIG. 6 shows a sectional illustration of a chip embedded in a card with an adapted test object
  • Fig. 7 schematic diagrams of an excitation and an associated echo signal
  • Fig. 8 is a schematic representation of a card with different authorization levels
  • Fig. 10 is a sectional view of an ear tag attached to the ear of a cow with an integrated sensor
  • FIG. 1 shows a corresponding identification system as part of a so-called authorization card 4 (credit card, system passport, identity card, etc.) with a built-in semiconductor chip 2.
  • An ultrasound transmitter 3 is arranged under the chip 2 and a damping body 17 is arranged below it.
  • a lead section body 14 is arranged above the chip 2, which is provided with an adaptation layer 19 for shaft-specific adaptation to the test object to be adapted and a thin protective layer 18 against mechanical injuries.
  • the adaptation layer 19 consists of a material which differs depending on the ultrasound frequencies used, the signal speed and the layer thickness in particular representing relevant adaptation parameters.
  • the ultrasonic frequencies used are in turn adapted to the structures of the test object.
  • the surface 7 the entire layer arrangement is the support or adaptation surface for the test object.
  • the ultrasound transmitter 3 is excited in a broadband manner by means of a sharp transmission pulse 1.
  • the damping body 17 also influences the broadband capability.
  • the ultrasound generator 3 can also be excited sequentially by a plurality of defined, selective frequencies.
  • the ultrasound signal emitted as a result of this excitation acquires the entire so-called feature space of the measuring arrangement, consisting of semiconductor chip 2, lead section body 14 and damping body 17, adaptation layer 19 and protective layer 18 by acoustic propagation.
  • the feature space can, in the figurative sense, as a sound body or resonance body of the system, of course own individual acoustic characteristics in the ultrasound range.
  • the adaptation surface 7 for the test object initially remains unoccupied in this method step.
  • the frequency-dependent scatter of the ultrasound measurement in the measuring arrangement is planted as a spread spectrum on the RF signal 5 and the correction spectrum 6 continued.
  • the RF signal 5 and the correction spectrum 6 contain the inherent noise of the semiconductor chip 2.
  • the semiconductor chip 2 can also be a microprocessor.
  • each measuring arrangement can be initialized before commissioning. This means that the specific and individual correction spectrum 6 for the defined measurement arrangement is formed in the manner just described. Production scatter from the production of the hardware for the measuring arrangement (device) etc. can thus be eliminated in a procedure preceding each use - just like the spread spectrum. This ensures that the test objects are always recognized and evaluated equally by any number of measuring arrangements.
  • the digital reference of the correction spectrum 6 can also serve for simple machine authentication of the special measuring arrangement itself if, for. B. the Card 4 is a smart card and the semiconductor chip 2 is a microprocessor, that is to say an electronic document or an electronic identification without a test object. This procedure is carried out using a target / actual comparison between a stored digital reference and currently determined measured values. It is a comparison between the relevant stored correction spectrum 6 and the currently recorded measured values 5.
  • the storage of the parameters of the correction spectrum 6 of a measuring arrangement can be stationary or also central, for example in a host, or decentrally, for. B. in the microprocessor chip if a smart card is used, in which the measurement functionality is integrated in the microprocessor chip.
  • the test object is a fingertip of a person that is to be identified, i.e. in other words, a biometric test object.
  • the fingertip is placed in such a way that the skin bar pattern of the fingertip with its inherent and latent epithelial structure 15 comes into full contact.
  • the pressure exerted by the finger on the adaptation surface is not decisive for the measurement, provided it does not impair the speed of sound at the phase transition.
  • the epithelial structure 15 now forms the feature space of the measuring arrangement together with the leading segment body 14, the semiconductor chip 2, the ultrasound transmitter 3 and the damping body 17, as well as the adaptation layer 19 and the protective layer 18.
  • the lead section body 14 and the arrival Fit layer 19 can be combined into a common unit in the form of a body or a layer.
  • the individual overall acoustic characteristics of this measurement arrangement are determined by the characteristics of the bodies involved and the functional modules and test objects connected to them by physical contact according to the structure-borne noise principle and wave physics.
  • the characteristic RF signals 11, which characterize the feature space as a whole, can be detected by the central, articulated scanning structures 16 in the semiconductor chip 2 ,
  • the latent epithelial structure 15 in the fingertip which characterizes the biometric test object finger 9 individually, is z. B. hidden by the choice of location, width and shape of a suitable time window 10 (a x b) in the RF signals 11. These parameters of the time window 10 and the reproducibility thereof are essential for the performance, i. H. the ability to differentiate, the identification system is crucial.
  • a spectrum 12 is generated from the relevant RF signal 10 by FFT (Fast Fourier Transformation) 8 '.
  • FFT Fast Fourier Transformation
  • the spectrum 12 is then divided by the correction spectrum 6.
  • this division receives 20 a spectrum 13, which is representative of the individuality of the test object 9 with its epithelial structure,
  • spectrum 13 Due to its preparation, spectrum 13 is to a certain extent calibrated, i. H. to be considered free of the unavoidable interference of the measuring arrangement etc. After its subsequent analog-digital conversion into a digital data record, which is described as a digital reference,
  • a piezoelectric transducer can also be realized in the same way. Alternatively, this can of course also be designed and arranged as a discrete functional element for sending and receiving.
  • the semiconductor substrate 2 is also available for the integration of further application-specific circuits on its surface. If necessary, a further functional semiconductor layer lying over it, which can above all be used as a logic chip or as an additional sensor chip, can also be arranged above the semiconductor substrate 2, if necessary.
  • the sensor chip 2 is covered by an adaptation layer 19, a protective layer 18 and a lead section body 14.
  • the surface 7 of the layer structure is the adaptation surface for the support of the test object.
  • One or more piezoelectric sensor arrays 21 and 22 are arranged along at least one side edge of the sensor chip 2, as can be seen in FIG. 3 below. These are preferably implemented by methods of semiconductor technology in the chip. If necessary, further sensor arrays can be arranged along the other edges of the sensor chip 2.
  • ultrasonic transducers implemented in the semiconductor substrates by means of semiconductor technology measures
  • locally discrete ultrasonic transducers can also be arranged.
  • FIG. 3 also schematically shows the primary excitation of the semiconductor chip 2 by ultrasound and the formation of the first propagating transverse waves 23.
  • Transversal reproduction begins in the action centers 24 of the applied ultrasound waves and ends at the area boundaries.
  • the transverse waves are reflected there.
  • Adjacent transversal or ring waves can form wave fronts 26 with increasing radii, which strive to limit the area.
  • the waves penetrate into the latter at the physical contact points.
  • the waves change their shape during the phase transition and occur instead of as transverse waves as longitudinal waves, spherical waves or surface waves. This change also occurs when they are scattered back and changed to another medium. It is reversible.
  • CD 0 IS! P. Q.
  • P P ⁇ - ⁇ - CO ⁇ - LQ P Qi ⁇ - ⁇ PJ P P Hi ⁇ P er ⁇ Qi ⁇ ⁇ - ⁇ P P rt PJ er P ⁇ ⁇ CQ ⁇ 1 tr P P ⁇ ⁇ P N P P CQ N
  • the user can be provided with signals which e.g. ask to leave the finger in a certain position or to move the finger in a certain direction in the manner of an operator prompt.
  • the finger in question can also be positioned in more or less uncoordinated, scanning the adaptation surface of the chip, e.g. circular movements that quickly find the position that the finger in question was in when it was first recorded on the sensor chip, if it supports this procedure by means of the time-reversal acoustics method.
  • the echo converter 37 of the chip is excited with the time-reversed echo signal 42 in succession as often and as long in corresponding oscillation cycles until the short and sharp previous excitation pulse in the epicenter 34
  • the echo signal preferably remains chip-resident, ie it remains stored in the logic part of the chip and can only be used within it.
  • the unique identity information contained in the echo signal or the echo signal itself can be regarded as a kind of virtual identity of the user. For certain transactions, however, it is necessary to provide an identity code to the outside world as a working code.
  • a sub-authorization for a sub-authorization to operate a motor vehicle with a key in the form of a smart card.
  • This authorization can be permanent or temporary.
  • the need for such sub-authorizations arises in various situations, e.g. with cards for system services, distribution in the automotive industry, such as car rental, fleet management, etc.
  • virtual identity could be reserved for higher-ranking applications, such as the delivery of biometrically supported electronic signatures with legally binding effect as an equivalent to handwritten signatures that could be generated using a smart card as legitimation.
  • each cattle 51 is given an ear tag 53 with appropriate tools on its ear 52.
  • the ear tag 53 differs from the previously customary ear tags in that it has a sensor 54 for contains a tamper-proof identification or verification of the cattle.
  • the sensor 53 can be, for example, the sensor described above, but also another sensor.
  • the ultrasonic frequency excitation takes place in the special case by a sufficiently energetic radiation of corresponding waves, e.g. B. a laser beam 60 on the epicenter 34 of the sensor in the ear tag, whereby their structure in the manner of the specific crystal lattice structure is dynamically excited to ultrasonic vibrations.
  • a sufficiently energetic radiation of corresponding waves e.g. B. a laser beam 60 on the epicenter 34 of the sensor in the ear tag, whereby their structure in the manner of the specific crystal lattice structure is dynamically excited to ultrasonic vibrations.
  • These mechanical vibrations are also transmitted into the adjacent tissue of the ear of the animal in question and from there are coupled back into the sensor body of the ear tag by means of individual backscattering, from which they are then detected and evaluated.
  • the backscattered ultrasound waves are modulated in accordance with the tissue interfaces on which the backscattering or reflection took place and thus contain information about these interfaces. This information differs from animal to animal and is therefore suitable for clearly identifying the animals.
  • the backscattered ultrasonic waves are received in the sensor body and converted into an output signal, which also contains the identification information.
  • the characteristic HF signal is recorded and preprocessed purely acoustically, ie mechanically.
  • a z. B. acousto-electrical transducer at the output of the sensor body the individual mechanical signals can then be electrically sampled and further processed for specific applications.
  • the sensor thus has at the same time the function of a transponder. However, it can also be upgraded with standard components to standard transponder versions.
  • the sensor body of the ear tag can be upgraded with corresponding circuits, possibly also with "intelligence", by integration into its semiconductor substrate.
  • external data processing via the interface is of course also possible.
  • the application it is important for the application to have a fixed, unchangeable attachment with intimate contact between the sensor body of the ear tag and the skin tissue of the animal ear.
  • the one that envelops it e.g. cylindrical surface can be used.
  • reliable identification and verification is guaranteed even if the animal increases drastically in size, weight and age as a result of growth spurts.
  • the latent, biometrically detectable, inherent and constant individualities of the extracellular matrix of the epithelial structure in the epidermis at the skin contact point serve as identification features of the sensory detection.
  • the senor and the connected transponder can be implanted in an acid-proof encapsulation in the epidermis in contact with the epithelial structure.
  • a reading or detection device 55 is used to identify or verify the animal. For reasons of practicality, this has the form of a mobile device that is hand-held. lent, robust and inexpensive and enables decentralized and fast registration of the animals.
  • the detection device 55 has a card terminal 56, into which a so-called smart card 57 provided with a semiconductor chip can be inserted. If the identification or Verification data of an animal are recorded for the first time, they are stored on the chip of the smart card 57, which then represents a specific and individual animal passport.
  • this data is simultaneously stored in the memory area of a central system administration 58 (host) for corresponding online identification and interesting evaluations.
  • the recording devices must also be online-capable and / or connectable to a remote data transmission (EDI).
  • EDI remote data transmission
  • the general biometric access control for all system users in the various system levels, such as B. can also be provided for the use of the detection devices mentioned.
  • a forced control to be implemented in this regard only allows authorized persons to use it within the defined scope of authorization. Only those are authorized who have personal legitimation, for example in the form of a smart card 59 with correspondingly legitimizing memory contents, before the criteria also include the digital reference of the personal individual biometric identification or verification code and also the digital reference of the physical authenticity code of the Have chips of the personal smart card which, in a target / actual comparison in the authorization check with regard to biometrics and authenticity, adequately correlate with currently recorded measured values.
  • the system administration host
  • the biometric user identification and verification takes place together with the authenticity control of the smart card as an electronic document and legitimation in a process of ultrasound-frequency dynamic excitation based on the evaluation of the individual common vibration behavior.
  • the fingertips adapted on the sensor are biometrically checked with regard to the individual nature of the latent inherent epithelial structure on the basis of their individual dynamic vibration behavior.
  • the ear tag with its biometric sensor body is only intended for use with a single animal. Each animal must therefore be assigned its own ear tag.
  • the ear tags generally do not require their own power supply for their sensory task, which has a particularly cost-effective and practical effect. The slightest changes in location of the ear tag on or in the tissue of the animal can no longer be corrected and lead to rejection in the identification or verification.
  • the energy radiated onto the sensor body of the ear tag is sufficient for the sensor detection of the identification signals for biometric identification or verification, even if an intelligent evaluation system is still established on board the sensor body and is supplied with electricity got to.
  • System cards that can be used can be used in an online network with the host in a decentralized position by authorized persons with appropriate command or master cards and from blank cards in z.
  • the card terminal of a recording device can be activated.
  • a similar organizational principle with hierarchical levels and the possibility of controlled, decentralized activation of system user cards with individual authentication is already described in the German patent no.
  • the identification signals of the person in question which are currently recorded biometrically in the system, are compared online with all digital biometric references of all registered system users stored centrally in the host. If there is a coincidence or if there is sufficient correlation between the currently recorded signal and one of the stored digital references of a registered system user, the person to be determined is considered identified.
  • the offline-capable verification of system users differs from the identification method, which must always be carried out online, in that the target-actual comparison between the currently recorded biometric measurement values and the digitally stored reference is only decentralized, ie in the memory areas the chip of the smart card, which is assigned to the corresponding system user as a legitimation and electronic document.
  • the authenticity check of the chip of the chip cards or smart cards is carried out together with the biometric identification or verification process by means of common ultrasonic frequency excitation.
  • the joint result of the two processes in the form of a corresponding RF signal and its spectra, if positive, represents the data record required for authorization for the desired system access.
  • containers of the most varied designs can also be authenticated with samples that are to be analyzed.
  • sample containers or carriers 68, 69, 70 are equipped with a sensor for compatible object authentication and biometry.
  • the corresponding dynamic excitation of the same takes place in turn by means of a detection device or terminal 55.
  • test object is excited to an ultrasound-frequency vibration state of its material structure and acoustic signals emanating from the structure are recorded.
  • a solid, a liquid medium or another system-compatible sample substance can be considered as the test object.
  • layers of substance can adhere to its surface, which change the vibration characteristics of the body.
  • the test object can also be the substance layer itself. to o

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un procédé permettant d'identifier la structure spatiale d'un objet à tester, notamment la structure épithéliale de la peau, par ex. le bout du doigt d'une personne à identifier. Selon ce procédé, l'objet à tester est disposé sur une surface d'appui et est soumis à l'action d'ondes ultrasonores à travers ladite surface. Les ondes renvoyées par l'objet à tester sont évaluées, du fait que les oscillations produites dans un cristal à semi-conducteur par les ondes ultrasonores renvoyées sont détectées par des transducteurs acousto-électriques disposés sur le cristal à semi-conducteur. Le dispositif utilisé pour mettre ledit procédé en oeuvre contient un émetteur ultrasonore et une puce semi-conductrice munie de transducteurs piézo-électriques, placée dans le parcours des ondes de l'ultrason renvoyé par l'objet testé.
PCT/IB2001/002490 2000-11-03 2001-10-29 Procede et dispositif pour identifier des objets a tester WO2002037402A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002222356A AU2002222356A1 (en) 2000-11-03 2001-10-29 Method and device for identifying test objects

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CH2150/00 2000-11-03
CH21502000 2000-11-03
CH2289/00 2000-11-24
CH22892000 2000-11-24
CH0486/01 2001-03-16
CH4862001 2001-03-16

Publications (1)

Publication Number Publication Date
WO2002037402A1 true WO2002037402A1 (fr) 2002-05-10

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PCT/IB2001/002490 WO2002037402A1 (fr) 2000-11-03 2001-10-29 Procede et dispositif pour identifier des objets a tester

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AU (1) AU2002222356A1 (fr)
WO (1) WO2002037402A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1533743A1 (fr) * 2003-11-18 2005-05-25 Samsung Electronics Co., Ltd. Détecteur d'empreintes digitales et sa méthode de fabrication
GB2414589A (en) * 2004-04-29 2005-11-30 Brian Vincent Conway Ultrasonic recognition system
WO2006026965A1 (fr) * 2004-09-10 2006-03-16 Frank Bechtold Procede et systeme d'optimisation de l'authentification ou de la securite d'authentification lors de l'identification ou de la verification d'objets de test
EP1659542A1 (fr) * 2004-11-19 2006-05-24 DaimlerChrysler AG Système de fermeture pour un véhicule
EP2578324A1 (fr) * 2010-12-10 2013-04-10 Palo Alto Research Center Incorporated Imagerie par contact ultrasonique de grande superficie
WO2015134816A1 (fr) * 2014-03-06 2015-09-11 Qualcomm Incorporated Imagerie ultrasonore multispectrale
US10503948B2 (en) 2014-03-06 2019-12-10 Qualcomm Incorporated Multi-spectral ultrasonic imaging

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3610397A1 (de) * 1986-03-27 1987-10-01 Storck Wolfgang Verfahren zum erkennen eines fingerabdruckes
EP0402779A2 (fr) * 1989-06-12 1990-12-19 Bicz, Wieslaw Procédé et dispositif de détermination de structures de surfaces
WO1994001043A1 (fr) * 1992-07-08 1994-01-20 Stockburger H Procede et dispositif d'identification d'objets a controler
DE4429680A1 (de) * 1993-08-26 1995-03-30 Topping Best Ltd Verfahren zum Erkennen von Ultraschall erfaßten Objekten
EP0805247A1 (fr) * 1996-04-30 1997-11-05 Siemens Aktiengesellschaft Dispositif d'identification
WO2000036406A1 (fr) * 1998-12-15 2000-06-22 Stockburger H Procede et dispositif pour la detection de caracteristiques de la structure spatiale d'un cristal

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3610397A1 (de) * 1986-03-27 1987-10-01 Storck Wolfgang Verfahren zum erkennen eines fingerabdruckes
EP0402779A2 (fr) * 1989-06-12 1990-12-19 Bicz, Wieslaw Procédé et dispositif de détermination de structures de surfaces
WO1994001043A1 (fr) * 1992-07-08 1994-01-20 Stockburger H Procede et dispositif d'identification d'objets a controler
DE4429680A1 (de) * 1993-08-26 1995-03-30 Topping Best Ltd Verfahren zum Erkennen von Ultraschall erfaßten Objekten
EP0805247A1 (fr) * 1996-04-30 1997-11-05 Siemens Aktiengesellschaft Dispositif d'identification
WO2000036406A1 (fr) * 1998-12-15 2000-06-22 Stockburger H Procede et dispositif pour la detection de caracteristiques de la structure spatiale d'un cristal

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1533743A1 (fr) * 2003-11-18 2005-05-25 Samsung Electronics Co., Ltd. Détecteur d'empreintes digitales et sa méthode de fabrication
CN100378997C (zh) * 2003-11-18 2008-04-02 三星电子株式会社 指纹传感器及其制作方法
US7400750B2 (en) 2003-11-18 2008-07-15 Samsung Electronics Co., Ltd. Fingerprint sensor and fabrication method thereof
GB2414589A (en) * 2004-04-29 2005-11-30 Brian Vincent Conway Ultrasonic recognition system
WO2006026965A1 (fr) * 2004-09-10 2006-03-16 Frank Bechtold Procede et systeme d'optimisation de l'authentification ou de la securite d'authentification lors de l'identification ou de la verification d'objets de test
EP1659542A1 (fr) * 2004-11-19 2006-05-24 DaimlerChrysler AG Système de fermeture pour un véhicule
EP2578324A1 (fr) * 2010-12-10 2013-04-10 Palo Alto Research Center Incorporated Imagerie par contact ultrasonique de grande superficie
WO2015134816A1 (fr) * 2014-03-06 2015-09-11 Qualcomm Incorporated Imagerie ultrasonore multispectrale
US10503948B2 (en) 2014-03-06 2019-12-10 Qualcomm Incorporated Multi-spectral ultrasonic imaging

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Publication number Publication date
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