fingerprint sensing
DESCRIPTION
finger print sensing power pointTRANSCRIPT
ApplicationsApplications Rahul SinghRahul Singh
Fingerprint #iometricFingerprint #iometric
First used in $hina in %!! ADFirst used in $hina in %!! AD
&roposed in 'urope in 1()(,&roposed in 'urope in 1()(,
implemented in *ermany in 1+!.implemented in *ermany in 1+!.
nique - So ar no t/o prints romnique - So ar no t/o prints rom
di0erent ngers have 2een ound thatdi0erent ngers have 2een ound that
are identicalare identical
epidermis o a ngerepidermis o a nger
Set o 3almost4oten5 parallel ridge linesSet o 3almost4oten5 parallel ridge lines
Ridges produce local patternsRidges produce local patterns
Source6 http644///.2iometrika.it4eng4/p7ngintro.html
ngerprintsngerprints ArchArch
Right 8oopRight 8oop
Five main classes oFive main classes o
ngerprintsngerprints ArchArch
Right 8oopRight 8oop
".". &rocess image and e:tract eatures&rocess image and e:tract eatures
.. Store data or comparison or compareStore data or comparison or compare
/ith stored templates/ith stored templates
Types o Fingerprint Sensors Types o Fingerprint Sensors
;ptic Re<e:ive;ptic Re<e:ive Finger lies on a prism. Total internal re<ectionFinger lies on a prism. Total internal re<ection
produces image o ngerprint on a camera chipproduces image o ngerprint on a camera chip
;ptic Transmissive /ith Fi2er ;ptic ⪭ptic Transmissive /ith Fi2er ;ptic &late 8ight source illuminates through the nger8ight source illuminates through the nger
Finger lies on 2er=optic plate that transmitsFinger lies on 2er=optic plate that transmits
image data to camera chipimage data to camera chip
;ptical 8ine;ptical 8ine &i:el array measures the light re<ected 2y the&i:el array measures the light re<ected 2y the
ngernger
$apacitive 8ine$apacitive 8ine $apacitor array measures the capacitance at each$apacitor array measures the capacitance at each
pi:elpi:el Thermal 8ine Thermal 8ine
Finger is moved across a narro/ array o thermalFinger is moved across a narro/ array o thermal sensorssensors
Temperature varies across the grooves and ridges Temperature varies across the grooves and ridges Thermal sensors measure the temperature di0erences Thermal sensors measure the temperature di0erences
over timeover time &ressure Sensitive&ressure Sensitive
Sensor measures the pressure per pi:elSensor measures the pressure per pi:el Dynamic $apacitiveDynamic $apacitive
$apacitance is measured 2y A4$ voltage$apacitance is measured 2y A4$ voltage
Source6 http644home.t=online.de4home4manred.2rom2a4paqe.htm
Types o Fingerprint Sensors Types o Fingerprint Sensors
Static $apacitive Type 1Static $apacitive Type 1 ;ne electrode per pi:el;ne electrode per pi:el $apacitance measured /.r.t neigh2oring pi:el.$apacitance measured /.r.t neigh2oring pi:el. > pi:el is on a groove capacitance is small> pi:el is on a groove capacitance is small > pi:el is on a ridge then capacitance is large> pi:el is on a ridge then capacitance is large
Static $apacitive Type "Static $apacitive Type " Same as a2ove e:cept capacitance is measureSame as a2ove e:cept capacitance is measure
/.r.t ground/.r.t ground
Acoustic 3ltrasound5Acoustic 3ltrasound5 >mage o ngerprint is recorded 2y very high>mage o ngerprint is recorded 2y very high requency soundrequency sound
Source6 http644home.t=online.de4home4manred.2rom2a4paqe.htm
$apacitive Sensing$apacitive Sensing Fingerprint consists o tightly spaced ridgesFingerprint consists o tightly spaced ridges
and valleysand valleys Sensor consists o a capacitive arraySensor consists o a capacitive array $apacitive array acts as one plate o a$apacitive array acts as one plate o a
capacitor /hile the nger acts as the othercapacitor /hile the nger acts as the other 'ach pi:el in the array is charged to a'ach pi:el in the array is charged to a
reerence voltage and allo/ed to dischargereerence voltage and allo/ed to discharge /ith a reerence current/ith a reerence current
The rate o change o potential at each pi:el is The rate o change o potential at each pi:el is proportional to the capacitance seen 2y theproportional to the capacitance seen 2y the arrayarray
dt
$apacitive Sensing$apacitive Sensing
1.1. $harge amp reset. >nverter ;4& settles to threshold$harge amp reset. >nverter ;4& settles to threshold
".". Re. charge applied to >4&Re. charge applied to >4&
.. ;4& ?oltage proportional to eed2ack capacitance;4& ?oltage proportional to eed2ack capacitance
.. >nverter ;4& upper saturation level i there is no eed2ack capacitance>nverter ;4& upper saturation level i there is no eed2ack capacitance
).). >nverter ;4& close to logical threshold /hen eed2ack capacitance is large>nverter ;4& close to logical threshold /hen eed2ack capacitance is large
Source6 http644///=micro.deis.uni2o.it4Btartagni4Finger4FingerSensor.html
)!! dpi Fingerprint image)!! dpi Fingerprint image
Source6 http644///.me.uCitsu.com4products42iometric4pd4Find7F&S.pd
Finger touches light emitting TactileSense polymerFinger touches light emitting TactileSense polymer
&hotodiode array em2edded in the glass detects&hotodiode array em2edded in the glass detects
illuminationillumination
an image o thean image o the
ngerprint onto angerprint onto a
camera 2y totalcamera 2y total
internal re<ection.internal re<ection.
Source6 http644///.2iometrika.it4eng4/p7ngintro.html
;ptical ?s $apacitive;ptical ?s $apacitive
$apacitive$apacitive *reater miniaturiation*reater miniaturiation Ge/er technologyGe/er technology $an 2e em2edded into small devices$an 2e em2edded into small devices &rone to dirt etc since nger touches silicon&rone to dirt etc since nger touches silicon Relatively cheapRelatively cheap
;ptical Sensors;ptical Sensors 8arger sensing area since manuacturing large8arger sensing area since manuacturing large
>mage quality>mage quality SharpnessSharpness
$ontrast$ontrast
DistortionDistortion
Resolution - higher isResolution - higher is
2etter2etter Too lo/ and /e cannot Too lo/ and /e cannot
detect the minutiaedetect the minutiae
Sensing areaSensing area Average ngerprint is a2outAverage ngerprint is a2out
!.)I : !.%I!.)I : !.%I
3leading to alse reCections53leading to alse reCections5 are reducedare reduced
Source6 http644///.2iometrika.it4eng4/p7scng.html
Hinutiae or *altonHinutiae or *alton
$haracteristics$haracteristics Termination o Ridge lines Termination o Ridge lines
#iurcation o Ridge lines#iurcation o Ridge lines
Source6 http644///.2iometrika.it4eng4/p7ngintro.html
Data Storage and HatchingData Storage and Hatching
Directional HapDirectional Hap Discrete matri: /hose elements denote theDiscrete matri: /hose elements denote the
3non=e:perts53non=e:perts5
TASK SPEED_DEFAULT SPEED_FAST
'(e!ti+icati! ,1-50. 3/35 #ec 1/43 #ec
'Lciency
Accuracy
FA F FA F
?erication time 31615?erication time 31615
Time to veriy the identity Time to veriy the identity
>dentication time 316)!5>dentication time 316)!5
M 1 secondM 1 second
Sensing area Sensing area
Authentec Finger8ocAuthentec Finger8oc
AF=S"AF=S" $apacitive$apacitive J( pin &8$$J( pin &8$$ Resolution6 ")! dpiResolution6 ")! dpi Array sie6 .)1"I:.)1"IArray sie6 .)1"I:.)1"I
AFS()!!AFS()!! $apacitive$apacitive 1 pin 8NF&1 pin 8NF& Resolution6 ")! dpiResolution6 ")! dpi Array Sie6 .(I : .Array Sie6 .(I : . (I(I
;ptical sensor;ptical sensor
!! prints per second on p>> !!.!! prints per second on p>> !!.
Resolution )!! dpiResolution )!! dpi
Average template sie )! 2ytesAverage template sie )! 2ytes
#iomouse &lus comes /ith 2uilt in#iomouse &lus comes /ith 2uilt in
smart card readersmart card reader
*ummi 2ears deeat ngerprint sensors*ummi 2ears deeat ngerprint sensors Qapanese cryptographer Qapanese cryptographer *elatin plastic mould*elatin plastic mould 8atent ngerprints rom glass8atent ngerprints rom glass $yanoacrylate Adhesive 3superglue ules5$yanoacrylate Adhesive 3superglue ules5 Digital cameraDigital camera Ado2e &hotoshopAdo2e &hotoshop &hotosensitive &$# - etched print in copper&hotosensitive &$# - etched print in copper Houlded nger /ith printHoulded nger /ith print
Source6 http644///.theregister.co.uk4content4))4")!!.html
to ngerprint captureto ngerprint capture
Detect 2lood <o/Detect 2lood <o/
Detect 2ody heatDetect 2ody heat
Types o attack Types o attack
#rute orce#rute orce 8atent print8atent print ReplayReplay TroCan Porses TroCan Porses Fake eatureFake eature Dead eatureDead eature ;ther 3sot/are leaks, 2ad security;ther 3sot/are leaks, 2ad security
policies etc5policies etc5
ser identication at kiosksser identication at kiosks
#iometric door locks#iometric door locks
$redit card security$redit card security
9eapon activation9eapon activation
$ards$ards Hotorola, AustraliaHotorola, Australia
Senior Ponors thesisSenior Ponors thesis Develop 2iometric security solutionDevelop 2iometric security solution
3prototype5 or Hotorola dual=slot phones3prototype5 or Hotorola dual=slot phones sers insert credit card into slot 1 or e=sers insert credit card into slot 1 or e=
commercecommerce Smart card /ith em2edded 2iometricSmart card /ith em2edded 2iometric
into slot "into slot " Fingerprint sensor on phone identiesFingerprint sensor on phone identies
$ards$ards Hotorola, AustraliaHotorola, Australia
$ards$ards Hotorola, AustraliaHotorola, Australia
Fingerprint #iometricFingerprint #iometric
First used in $hina in %!! ADFirst used in $hina in %!! AD
&roposed in 'urope in 1()(,&roposed in 'urope in 1()(,
implemented in *ermany in 1+!.implemented in *ermany in 1+!.
nique - So ar no t/o prints romnique - So ar no t/o prints rom
di0erent ngers have 2een ound thatdi0erent ngers have 2een ound that
are identicalare identical
epidermis o a ngerepidermis o a nger
Set o 3almost4oten5 parallel ridge linesSet o 3almost4oten5 parallel ridge lines
Ridges produce local patternsRidges produce local patterns
Source6 http644///.2iometrika.it4eng4/p7ngintro.html
ngerprintsngerprints ArchArch
Right 8oopRight 8oop
Five main classes oFive main classes o
ngerprintsngerprints ArchArch
Right 8oopRight 8oop
".". &rocess image and e:tract eatures&rocess image and e:tract eatures
.. Store data or comparison or compareStore data or comparison or compare
/ith stored templates/ith stored templates
Types o Fingerprint Sensors Types o Fingerprint Sensors
;ptic Re<e:ive;ptic Re<e:ive Finger lies on a prism. Total internal re<ectionFinger lies on a prism. Total internal re<ection
produces image o ngerprint on a camera chipproduces image o ngerprint on a camera chip
;ptic Transmissive /ith Fi2er ;ptic ⪭ptic Transmissive /ith Fi2er ;ptic &late 8ight source illuminates through the nger8ight source illuminates through the nger
Finger lies on 2er=optic plate that transmitsFinger lies on 2er=optic plate that transmits
image data to camera chipimage data to camera chip
;ptical 8ine;ptical 8ine &i:el array measures the light re<ected 2y the&i:el array measures the light re<ected 2y the
ngernger
$apacitive 8ine$apacitive 8ine $apacitor array measures the capacitance at each$apacitor array measures the capacitance at each
pi:elpi:el Thermal 8ine Thermal 8ine
Finger is moved across a narro/ array o thermalFinger is moved across a narro/ array o thermal sensorssensors
Temperature varies across the grooves and ridges Temperature varies across the grooves and ridges Thermal sensors measure the temperature di0erences Thermal sensors measure the temperature di0erences
over timeover time &ressure Sensitive&ressure Sensitive
Sensor measures the pressure per pi:elSensor measures the pressure per pi:el Dynamic $apacitiveDynamic $apacitive
$apacitance is measured 2y A4$ voltage$apacitance is measured 2y A4$ voltage
Source6 http644home.t=online.de4home4manred.2rom2a4paqe.htm
Types o Fingerprint Sensors Types o Fingerprint Sensors
Static $apacitive Type 1Static $apacitive Type 1 ;ne electrode per pi:el;ne electrode per pi:el $apacitance measured /.r.t neigh2oring pi:el.$apacitance measured /.r.t neigh2oring pi:el. > pi:el is on a groove capacitance is small> pi:el is on a groove capacitance is small > pi:el is on a ridge then capacitance is large> pi:el is on a ridge then capacitance is large
Static $apacitive Type "Static $apacitive Type " Same as a2ove e:cept capacitance is measureSame as a2ove e:cept capacitance is measure
/.r.t ground/.r.t ground
Acoustic 3ltrasound5Acoustic 3ltrasound5 >mage o ngerprint is recorded 2y very high>mage o ngerprint is recorded 2y very high requency soundrequency sound
Source6 http644home.t=online.de4home4manred.2rom2a4paqe.htm
$apacitive Sensing$apacitive Sensing Fingerprint consists o tightly spaced ridgesFingerprint consists o tightly spaced ridges
and valleysand valleys Sensor consists o a capacitive arraySensor consists o a capacitive array $apacitive array acts as one plate o a$apacitive array acts as one plate o a
capacitor /hile the nger acts as the othercapacitor /hile the nger acts as the other 'ach pi:el in the array is charged to a'ach pi:el in the array is charged to a
reerence voltage and allo/ed to dischargereerence voltage and allo/ed to discharge /ith a reerence current/ith a reerence current
The rate o change o potential at each pi:el is The rate o change o potential at each pi:el is proportional to the capacitance seen 2y theproportional to the capacitance seen 2y the arrayarray
dt
$apacitive Sensing$apacitive Sensing
1.1. $harge amp reset. >nverter ;4& settles to threshold$harge amp reset. >nverter ;4& settles to threshold
".". Re. charge applied to >4&Re. charge applied to >4&
.. ;4& ?oltage proportional to eed2ack capacitance;4& ?oltage proportional to eed2ack capacitance
.. >nverter ;4& upper saturation level i there is no eed2ack capacitance>nverter ;4& upper saturation level i there is no eed2ack capacitance
).). >nverter ;4& close to logical threshold /hen eed2ack capacitance is large>nverter ;4& close to logical threshold /hen eed2ack capacitance is large
Source6 http644///=micro.deis.uni2o.it4Btartagni4Finger4FingerSensor.html
)!! dpi Fingerprint image)!! dpi Fingerprint image
Source6 http644///.me.uCitsu.com4products42iometric4pd4Find7F&S.pd
Finger touches light emitting TactileSense polymerFinger touches light emitting TactileSense polymer
&hotodiode array em2edded in the glass detects&hotodiode array em2edded in the glass detects
illuminationillumination
an image o thean image o the
ngerprint onto angerprint onto a
camera 2y totalcamera 2y total
internal re<ection.internal re<ection.
Source6 http644///.2iometrika.it4eng4/p7ngintro.html
;ptical ?s $apacitive;ptical ?s $apacitive
$apacitive$apacitive *reater miniaturiation*reater miniaturiation Ge/er technologyGe/er technology $an 2e em2edded into small devices$an 2e em2edded into small devices &rone to dirt etc since nger touches silicon&rone to dirt etc since nger touches silicon Relatively cheapRelatively cheap
;ptical Sensors;ptical Sensors 8arger sensing area since manuacturing large8arger sensing area since manuacturing large
>mage quality>mage quality SharpnessSharpness
$ontrast$ontrast
DistortionDistortion
Resolution - higher isResolution - higher is
2etter2etter Too lo/ and /e cannot Too lo/ and /e cannot
detect the minutiaedetect the minutiae
Sensing areaSensing area Average ngerprint is a2outAverage ngerprint is a2out
!.)I : !.%I!.)I : !.%I
3leading to alse reCections53leading to alse reCections5 are reducedare reduced
Source6 http644///.2iometrika.it4eng4/p7scng.html
Hinutiae or *altonHinutiae or *alton
$haracteristics$haracteristics Termination o Ridge lines Termination o Ridge lines
#iurcation o Ridge lines#iurcation o Ridge lines
Source6 http644///.2iometrika.it4eng4/p7ngintro.html
Data Storage and HatchingData Storage and Hatching
Directional HapDirectional Hap Discrete matri: /hose elements denote theDiscrete matri: /hose elements denote the
3non=e:perts53non=e:perts5
TASK SPEED_DEFAULT SPEED_FAST
'(e!ti+icati! ,1-50. 3/35 #ec 1/43 #ec
'Lciency
Accuracy
FA F FA F
?erication time 31615?erication time 31615
Time to veriy the identity Time to veriy the identity
>dentication time 316)!5>dentication time 316)!5
M 1 secondM 1 second
Sensing area Sensing area
Authentec Finger8ocAuthentec Finger8oc
AF=S"AF=S" $apacitive$apacitive J( pin &8$$J( pin &8$$ Resolution6 ")! dpiResolution6 ")! dpi Array sie6 .)1"I:.)1"IArray sie6 .)1"I:.)1"I
AFS()!!AFS()!! $apacitive$apacitive 1 pin 8NF&1 pin 8NF& Resolution6 ")! dpiResolution6 ")! dpi Array Sie6 .(I : .Array Sie6 .(I : . (I(I
;ptical sensor;ptical sensor
!! prints per second on p>> !!.!! prints per second on p>> !!.
Resolution )!! dpiResolution )!! dpi
Average template sie )! 2ytesAverage template sie )! 2ytes
#iomouse &lus comes /ith 2uilt in#iomouse &lus comes /ith 2uilt in
smart card readersmart card reader
*ummi 2ears deeat ngerprint sensors*ummi 2ears deeat ngerprint sensors Qapanese cryptographer Qapanese cryptographer *elatin plastic mould*elatin plastic mould 8atent ngerprints rom glass8atent ngerprints rom glass $yanoacrylate Adhesive 3superglue ules5$yanoacrylate Adhesive 3superglue ules5 Digital cameraDigital camera Ado2e &hotoshopAdo2e &hotoshop &hotosensitive &$# - etched print in copper&hotosensitive &$# - etched print in copper Houlded nger /ith printHoulded nger /ith print
Source6 http644///.theregister.co.uk4content4))4")!!.html
to ngerprint captureto ngerprint capture
Detect 2lood <o/Detect 2lood <o/
Detect 2ody heatDetect 2ody heat
Types o attack Types o attack
#rute orce#rute orce 8atent print8atent print ReplayReplay TroCan Porses TroCan Porses Fake eatureFake eature Dead eatureDead eature ;ther 3sot/are leaks, 2ad security;ther 3sot/are leaks, 2ad security
policies etc5policies etc5
ser identication at kiosksser identication at kiosks
#iometric door locks#iometric door locks
$redit card security$redit card security
9eapon activation9eapon activation
$ards$ards Hotorola, AustraliaHotorola, Australia
Senior Ponors thesisSenior Ponors thesis Develop 2iometric security solutionDevelop 2iometric security solution
3prototype5 or Hotorola dual=slot phones3prototype5 or Hotorola dual=slot phones sers insert credit card into slot 1 or e=sers insert credit card into slot 1 or e=
commercecommerce Smart card /ith em2edded 2iometricSmart card /ith em2edded 2iometric
into slot "into slot " Fingerprint sensor on phone identiesFingerprint sensor on phone identies
$ards$ards Hotorola, AustraliaHotorola, Australia
$ards$ards Hotorola, AustraliaHotorola, Australia