Evaluations Template by vtc12324

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									                Operating Principles for
                 Very small fingerprint
                       sensors


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DRS \\ 7jun02
                         Progress in low-cost sensor systems
                The first step is the movement from

                    Modular sensor devices  silicon
                     integrated sensor devices
                     –   Cost is now driven by silicon size

                The second step is a new generation of
                very small devices

                    Small touch sensors

                    Small slide sensors




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DRS \\ 7jun02
                An example of a very small touch sensor




                                        Size of active
                                        sensing area




                                      AuthenTec AES-3500
                                       small touch sensor



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DRS \\ 7jun02
                         How do small touch sensors work

                Acquiring enough repeatable information to match
                accurately
                   Use the higher density small-scale feature
                    information captured in high quality TruePrint images
                    to perform matching using less skin area

                Allowing flexible finger positioning on the sensor
                   Use template compositing to store areas of finger
                    skin larger than the sensor itself



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DRS \\ 7jun02
    High Resolution
   TruePrint Imaging
 AuthenTec’s very
 small touch sensors
 can capture highly
 detailed images
 with excellent
 repeatably.


 This image is from
 an AES-3500
 sensor running
 experimental high
 resolution control
 software.

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DRS \\ 7jun02
    High Resolution
   TruePrint Imaging

  A topographic
  analysis program
  highlights some of
  the detail that can
  be extracted from
  the image.




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                   Flexible finger positioning using a
                composite template – concept illustration
   Single touch images    Multiple touches during the enroll process
                            Are logically interconnected
                            Into a larger composite template



                                                    Composite template




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DRS \\ 7jun02
                          What information can be contained
                              in a composite template?


       Template is:
               Several views of a
                finger

               Location of each
                view relative to     •Relative location   Image representation
                others               • Confidence         Pattern representation
                                                          Feature (minutia) data
               Image and/or
                                                          Other data
                feature data for
                each view


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DRS \\ 7jun02
                    Verification using a composite template
            Conceptually:                                                     Template
                   Compare live view against
                    each template view                                           Live
                   Final score is statistical                                  image

                    combination of all
                    evaluations
                                                               • Relative Location
                                                               • Match Score



                                                     Final score                     Match or
                                                     calculation                     non-match


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DRS \\ 7jun02
                         How do small slide sensors work

                Acquiring enough repeatable information to match
                accurately
                   Slide the finger across the sensor
                   Capture a “stream” of small image slices

                Allowing flexible finger positioning on the sensor
                   Same sliding usage method allows flexible finger
                    positioning




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DRS \\ 7jun02
                              Slide sensor operation
  Slide sensors are required where lowest cost is paramount.
                                           slide
                                                   User slides the finger
                                                    across the sensor

                                                    Sensor


                                                   Stream of image slices


                   Template              Small local           Match or
                                         processor
                                                              non-match
            Inexpensive devices usually have small processors.

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DRS \\ 7jun02
                                    Slide sensor processing options
                                                   Stream of          Stitched
                                   Sensor
                                                  image slices         image
                                                                     segments
                 Finger movement




                                                                        Match
                                   Matching       Match raw            stitched
                                   Options
                                              =    slices        |      image
                                                                      segments
                Increasing processor load
                                                      12
DRS \\ 7jun02
                       Comparison of small sensors
                   Sensor     Ease of        Typical     Front       Interface
                   Cost       use            biometric   panel       bandwidth
                                             accuracy    footprint   needed
          Small    Very low   Best           Best        Small       Low
          touch
          sensor

          Small    Lowest     Good           Good        Smallest    High
          slide
          sensor




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                       For more information …



                Click here to learn         Click here to learn
                 about fingerprint          about Specifying
                Matching methods               commercial
                                           biometric systems




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                                      14
DRS \\ 7jun02

								
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