Development	of NFIQ 2.0

elham.tabassi@nist.gov

h:p://www.nist.gov/itl/iad/ig/development_nfiq_2.cfm

September 17, 2013

Biometric ConsorKum
	 	 	

	 	

	 	 	

	 	 	 	

	 	

	 	 	 	

Outline

» History +	Background

» Sponsors +	Team Members

» Architecture

» Features

» Machine Learning

» NFIQ 2.0 prototype

» NFIQ 2.0 Lite (Mobile)

» AcKonable quality

» RelaKon to ISO/IEC 29794-4

» Discussion
	 	

p

•Workshop on March 6, 2010

(IBPC 2010) o rksh•NFIQ	2.0 wish-list as of

March 2010

•Several opKons for NFIQ 2.0

were discussed 	 	

wo•h:p://biometrics.nist.gov/

cs_links/ibpc2010/

opKons_for_NFIQ2.0.pdf

•The community

201overwhelmingly

recommended a	new, open

source, generalized version of

NFIQ to be developed in

consultaKon and

collaboraKon with users and

industry.

•Same technical approach,

but	be:er, bigger, faster,

etc.		

•Workshop on March 5, 2012 p

(IBPC 2012)

orkshNFIQ 2.0 wish-list as of March 2010 

Components as of March 2012 

wo•Community asked for:

•AcKonable flags

•providerID

2012•Versioning

•Latent?

2004 - present	

2004•Release of NFIQ 1.0

•Novel definiKon of biometric

quality		

•performance related

•accepted by the community

•Interoperability		

•uniform interpretaKon

•tuned to a	class of matcher		

•Open	source

•Extensively examined

•by NIST and others

•tools for quality

summarizaKon, slap, ...
	 	 	

	 	

	 	

	 	

	 	

	 	

	 	 	

	 	 	 	

	 	 	

	 	 	 	

NFIQ 2.0 Community

Team Members Sponsors	

≫ NIST (US)

≫ BSI	(Germany)

≫ BKA (Germany)

≫ Fraunhofer IGD

≫ MITRE (US)

≫ Hochschule Darmstadt	/ CASED

≫ Secunet Security Networks AG

≫ NFIQ 2.0 ParKcipants

≫ ...and the whole biometrics

community
	 	

	 	 	

	 	

	 	

	 	 	 	

	 	 	

	 	 	

	 	 	 	

	 	 	

	 	 	

	 	 	 		

	 	 		

Team Members

US

» Elham Tabassi (NIST)

» Patricia	Flanagan (NIST)

» Greg Fiumara (NIST)

» Carol Nowacki, Carol (MITRE)

» Adam Day (MITRE)

» Marc Colosimo (MITRE)

» MarKn Olsen (HDA, NIST)

DE

» Christoph Busch (HAD)

» Oliver Bausinger (BSI)

» Johannes Merkle (SEC)

» Michael Schwaiger (SEC)

» Christopher Schiel (BKA)	

» Timo Ruhland (BKA)	

» Alexander Nouak (IGD)

» Olaf Henniger (IGD)
	 	 	

 

 

 

 

 

 

 

 

Framework 

NFIQ 2.0 Development 

Tools NFIQ 2.0 NFIQ 2.0 light ...

Image Format Converter 

- extractQualityFeatures() 

- calculateUtility() 

- startTraining() 

- ... 

- checkQuality() 

Input/Output 

Interface Input/Output Module 

Quality Feature 

Extraction Interface 

Utility Estimation 

Interface 

Machine Learning 

Interface 

Quality Feature 

Extraction Module

Utility Estimation 

Module

Machine Learning 

Module 

- Fingerprint images 

- Quality features - Utility computation - Prediction - Feature extraction - Comparison scores - Fusion & binning - Training 

- Utility values 

MLP 

Quality 

feature x 

... Utility x 

... ... Database 

... Filesystem 

NFIQ 2.0 Framework
1F_07_poebva_p2p 1T_02_poebva_p2p id3_07_poebva_p2p pb_02_poebva_p2p

1F_02_poebva_p2p 1Y_07_poebva_p2p id3_02_poebva_p2p R_07_poebva_p2p

1O_07_poebva_p2p

1O_02_poebva_p2p

1T_07_poebva_p2p

1Y_02_poebva_p2p dermalog_07_poebva_p2p R_02_poebva_p2p

2B_07_poebva_p2p dermalog_02_poebva_p2p

2B_02_poebva_p2p pb_07_poebva_p2p

FNMR

0.100

0.050

0.020

0.010

0.005

0.002

0.000010 0.000020 0.000050 0.000100 0.000200 0.000500 0.001000 0.002000 0.005000 0.010000 0.020000 0.050000 0.100000 0.200000

FMR

NFIQ	 	 	 	 	 2.0 comparison score provider
	 	 	

	 	 	 	 	 	

	 	

	 	

NFIQ	2.0 FEATURES

NFIQ 1.0 features

Recommended Features in ISO/IEC 29794-4:2009 +	our modificaKons

Surveyed literature +	out	modificaKons

Open	source FingerjetFx minuKa	extractor
	 	 		

	 	 	

	 	 	

	 	 	

	 	

	 	 	

	 	 	

	 	 	 	

	 	

	 	

	 	

	 	 	 	

	 	 	

	 	 	 	 	 	 	 	 	

	 	 	 	 	 	

	 	 	 	 	

	 	

NFIQ 2.0 features

Image/signal	processing

» Local clarity score

» Ridge valley uniformity

» OrientaKon certainty level

» OrientaKon flow

» Frequency domain analysis

» Radial power spectrum

» Gabor filters (several variants)

MinuFae based

» FingerjetFx

• Open source implementaKon

from	digitalPersona

• Digitalpersona.com/fingerjemx

» Total count	of minuKa	

» Count	of minuKa	in region of

interest	

• Various selecKon of ROI	

Standardized features allow for plug and play of feature computaKon

implementaKons that	are semanKcally conformant	to the standard (i.e.,

ISO/IEC 29794-4 and ISO/IEC 19794-4).

Different	implementaKons are disKnguished via	providerID.	
s

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FJFXPos_OCL_MinutiaeQuality_0 

FJFXPos_OCL_MinutiaeQuality_20 Feature ID in Framework Comments FJFXPos_OCL_MinutiaeQuality_40 NFIQ1_Feature_1 

NFIQ1_Feature_2 

NFIQ1_Feature_3 

NFIQ1_Feature_4 

NFIQ1_Feature_5 

NFIQ1_Feature_6 

NFIQ1_Feature_7 

NFIQ1_Feature_8 

NFIQ1_Feature_9 

NFIQ1_Feature_10 

NFIQ1_Feature_11 

NFIQ1_Time_All 

FingerJetFX_MinutiaeCount 

FingerJetFX_MinutiaeQuality_0 

FingerJetFX_MinutiaeQuality_1 

FingerJetFX_MinutiaeQuality_2 

FingerJetFX_MinutiaeQuality_3 

FingerJetFX_MinutiaeQuality_4 

FingerJetFX_MinutiaeQuality_5 

FingerJetFX_MinutiaeQuality_6 

FingerJetFX_MinutiaeQuality_7 

FingerJetFX_MinutiaeQuality_8 

FingerJetFX_MinutiaeQuality_9 

FingerJetFX_MinutiaeQuality_10 

FingerJetFX_AverageMinutiaeQuality 

FingerJetFX_ROIBlockArea 

FingerJetFX_ROIBlockAbs 

FingerJetFX_MinCount_COMMinRect200x200 

FingerJetFX_MinCount_COMMinRect300x200 

FingerJetFX_MinCount_COMMinCircle200 

FingerJetFX_MinCount_COMMinCircle250 

FingerJetFX_MinCount_COMGrayRect200x200 

FingerJetFX_MinCount_COMGrayRect300x200 

FingerJetFX_MinCount_COMGrayCircle200 

FingerJetFX_MinCount_COMGrayCircle250 

FingerJetFX_Time_All 

Original NFIQ1 Feature 1 

Original NFIQ1 Feature 2 

Original NFIQ1 Feature 3 

Original NFIQ1 Feature 4 

Original NFIQ1 Feature 5 

Original NFIQ1 Feature 6 

Original NFIQ1 Feature 7 

Original NFIQ1 Feature 8 

Original NFIQ1 Feature 9 

Original NFIQ1 Feature 10 

Original NFIQ1 Feature 11 

Speed computation of NFIQ1 features in ms 

Number of detected minutiae (no limitation as in original FJFX source code) 

Percentage of minutiae that have minutiae quality of 0 (= not calculated) 

Percentage of minutiae that have minutiae quality between 1 and 10 

Percentage of minutiae that have minutiae quality between 11 and 20 

Percentage of minutiae that have minutiae quality between 21 and 30 

Percentage of minutiae that have minutiae quality between 31 and 40 

Percentage of minutiae that have minutiae quality between 41 and 50 

Percentage of minutiae that have minutiae quality between 51 and 60 

Percentage of minutiae that have minutiae quality between 61 and 70 

Percentage of minutiae that have minutiae quality between 71and 80 

Percentage of minutiae that have minutiae quality between 81 and 90 

Percentage of minutiae that have minutiae quality between 91 and 100 

Arithemtic mean (average) of FJFX quality value of all minutiae 

Percentage of blocks that have at least one minutia in it (block size 32x32 pixels) 

Absolute number of blocks that have at least one minutia in it (block size 32x32 pixels) 

Number of minutiae detected in rectangle of 200x200 pixels around centre of mass (based on minutiae locations) 

Number of minutiae detected in rectangle of 300x200 pixels around centre of mass (based on minutiae locations) 

Number of minutiae detected in a circle of diameter 200 pixels around centre of mass (base on minutiae locations) 

Number of minutiae detected in a circle of diameter 250 pixels around centre of mass (base on minutiae locations) 

Number of minutiae detected in rectangle of 200x200 pixels around centre of mass (based on grayvalues) 

Number of minutiae detected in rectangle of 300x200 pixels around centre of mass (based on grayvalues) 

Number of minutiae detected in a circle of diameter 200 pixels around centre of mass (base on grayvalues) 

Number of minutiae detected in a circle of diameter 250 pixels around centre of mass (base on grayvalues) 

Speed computation of FJFX feature extraction (of all features within this module, including COM and ROI based features) in ms 

Average minutiae quality based on mean and stddev of pixel grayvalues (=Mu) of a 32x32 pixels block around minutiae location 

Percentage of Mu values (as defined above) that have value <= -0.5 

Percentage of Mu values (as defined above) that have value > -0.5 and <= 0 

Percentage of Mu values (as defined above) that have value > 0 and <= 0.5 

Percentage of Mu values (as defined above) that have value > 0.5 

MMB value of square (size 224x224 pixels, block size 32x32 pixels) around centre of mass (based on minutiae locations) 

Average of minutiae quality that was computed based on the OCL value around each minutiae location 

FJFXPos_OCL_MinutiaeQuality_60 

FJFXPos_OCL_MinutiaeQuality_80 

FJFXPos_OCL_4Blocks_AverageMinQuality 

FJFXPos_Coherence_AvgMinQuality 

FJFXPos_CMEnh_InhQual_AvgMinQual 

FJFXPos_MinutiaeFusion_1 

FJFXPos_AvgMinReliability_QMEnh 

FJFXPos_AvgMinReliability_QMAdv 

FJFXPos_MinutiaeFusion_2 

FJFXPos_QualityMapEnh_AvgMinQual 

FJFXPos_LCS_AverageMinutiaeQuality 

FJFXPos_RVU_AverageMinutiaeQuality 

FJFXPos_LowFlow_AverageMinutiaeQuality 

Percentage of minutiae quality values (based on OCL value around each minutiae location) between 0 and 20 

Percentage of minutiae quality values (based on OCL value around each minutiae location) between 20 and 40 

Percentage of minutiae quality values (based on OCL value around each minutiae location) between 40 and 60 

Percentage of minutiae quality values (based on OCL value around each minutiae location) between 60 and 80 

Percentage of minutiae quality values (based on OCL value around each minutiae location) between 80 and 100 

Average of minutiae quality that was computed based on the mean of all OCL values around each minutiae location (4 blocks around 

Average of minutiae quality that was computed based on the coherence value of the orientation map field of the block in which the min 

Average of minutiae quality that was computed based on the inhomogenety quality value of the enhanced contrast map 

Average of fused minutiae quality that was computed based on OCL, Mu, coherence values and enhanced constrast map values 

Average of minutiae quality that was computed on the reliability value retrieved from the enhanced quality map 

Average of minutiae quality that was computed on the reliability value retrieved from the advanced quality map 

Average of fused minutiae quality that was computed based on OCL, Mu, coherence values, enhanced quality map zones and enhanc

Average of minutiae quality that was computed based on the quality zones determined by the enhanced quality map 

Average of minutiae quality that was computed based on block-wise LCS 

Average of minutiae quality that was computed based on block-wise RVU 

Average of minutiae quality that was computed based on block-wise values returned by the low flow map 

FJFXPos_Time_All Speed computation of minutiae quality computation values 

OCL Orientation Certainty Level (OCL) of whole image 

OCL_Time Speed computation of OCL computation 

QualityMap_HighContrastBlocks 

QualityMap_Time 

OrientationMap_Time 

OrientationMap_ROIFilter_Time 

QualityMapEnh_Time 

QualityMapAdv_Time 

LowFlowMap_Time 

OrientationMap_ROIFilter_CoherenceSum 

OrientationMap_ROIFilter_CoherenceRel 

OrientationMap_CoherenceSum 

OrientationMap_CoherenceRel 

QualityMap_Foreground 

QualityMap_RelCount_1 

QualityMap_RelCount_2 

QualityMap_RelCount_3 

QualityMap_RelCount_4 

ContrastMapEnh_HighContrastBlocks 

ContrastMapEnh_AvgInhomogenety 

ContrastMapEnh_AvgSmoothness 

ContrastMapEnh_AvgUniformity 

ContrastMapEnh_AvgQuality 

Number of blocks that have high contrast according to NFIQ1 low contrast map (re-implemented using OpenCV) 

Speed computation of quality map computation (low contrast map, enhanced orientation map, high curve map) 

Speed computation of orientation map (without ROI filtering) 

Speed computation of orientation map determination with ROI filtering 

Speed computation of enhanced quality map computation (enhanced low contrast map, enhanced orientation map, low flow map, high 

Speed computation of advanced quality map computation (enhanced low contrast map, enhanced orientation map, high curve map) 

Speed computation of low flow map 

Sum of all blockwise coherence values based on orientation map computation (block size 16) with applied ROI filter of ImgProcROI mo 

Relative number of all blockwise coherence values based on orientation map computation (block size 16) with applied ROI filter of Img 

Sum of all blockwise coherence values based on orientation map computation (block size 16) of the whole image 

Relative number of all blockwise coherence values based on orientation map computation (block size 16) of the whole image 

Number of foreground blocks based on the quality map computation (similar but not identical to NFIQ1 quality map with block size 8) 

Relative number of quality map blocks that have an assigned value of 1 (similar but not identical to NFIQ1 quality map with block size 

Relative number of quality map blocks that have an assigned value of 2 (similar but not identical to NFIQ1 quality map with block size 

Relative number of quality map blocks that have an assigned value of 3 (similar but not identical to NFIQ1 quality map with block size 

Relative number of quality map blocks that have an assigned value of 4 (similar but not identical to NFIQ1 quality map with block size 

Number of high contrast blocks according to the computation results of the enhanced contrast map 

Average of block-wise inhomogenety values returned by enhanced contrast map 

Average of block-wise smoothness values returned by enhanced contrast map 

Average of block-wise uniformity values returned by enhanced contrast map 

Average of block-wise quality values based on the returned inhomogenety, uniformity and smoothness values of the enhanced contra 

QualityMapEnh_HighFlowBlocks 

QualityMapEnh_LowFlowBlocks 

QualityMapEnh_Foreground 

QualityMapEnh_RelCount_1 

QualityMapEnh_RelCount_2 

QualityMapEnh_RelCount_3 

QualityMapEnh_RelCount_4 

QualityMapAdv_Foreground 

QualityMapAdv_RelCount_1 

QualityMapAdv_RelCount_2 

QualityMapAdv_RelCount_3 

QualityMapAdv_RelCount_4 

LowFlowMap24_HighFlowBlocks 

LowFlowMap24_Time Speed computation of low flow map with block size 24 x 24 

LowFlowMap32_HighFlowBlocks Number of high flow blocks determined by the low flow map (block size 32 x 32) 

LowFlowMap32_Time Speed computation of low flow map with block size 32 x 32 

Gab 

GSh 

LCS 

OCL_S 

OCL_CD 

RVU_P 

RVU_NP 

OF 

RPS 

FDA 

FingerJetFX_Time Speed computation of FJFX minutiae extraction and ISO container parsing 

Mu Mu (= mean of all pixel values) 

MMB Mu Mu Block (MMB) (= mean of all blockwise mean intensity values) 

Sigma Sigma (= standard deviation of pixel values) 

Mu_Time Speed computation of Mu feature 

MMB_Time Speed computation of MMB feature 

Sigma_Time Speed computation of Sigma feature 

ImgProcROIBlockArea Percentage of ROI blocks in relation to all blocks of image (block size 32x32 pixels) 

ImgProcROIBlockAbs Absolute number of ROI blocks in image (block size 32x32 pixels) 

ImgProcROIPixelArea Percentage of ROI pixels in relation to total number of pixels of image 

ImgProcROIPixelAbs Absolute number of ROI pixels in image 

ImgProcROIArea_Mean Mean value (= Mu) of ROI blocks only 

ImgProcROIArea_StdDev Standard deviation (= sigma) of ROI blocks only 

ImgProcROIArea_OCL Orientation Certainty Level (OCL) feature value of ROI blocks only 

ImgProcROIArea_Time Speed computation of ImgProcROI features 

ImgProcROIArea_OCL_Time Speed computation of ImgProcROIArea_OCL feature 

FJFXPos_Mu_AverageMinutiaeQuality 

FJFXPos_Mu_MinutiaeQuality_0 

FJFXPos_Mu_MinutiaeQuality_1 

FJFXPos_Mu_MinutiaeQuality_2 

FJFXPos_Mu_MinutiaeQuality_3 

FJFXPos_COMMin_MMB_224 

FJFXPos_OCL_AverageMinutiaeQuality 

ContrastMapEnh_Time Speed computation of enhanced contrast map computation 

Number of high flow blocks determined by the enhanced quality map (low flow map) 

Number of low flow blocks determined by the enhanced quality map (low flow map) 

Number of foreground blocks based on the quality map computation (similar but not identical to NFIQ1 quality map with block size 8) 

Relative number of enhanced quality map blocks that have an assigned value of 1 (similar but not identical to NFIQ1 quality map with 

Relative number of enhanced quality map blocks that have an assigned value of 2 (similar but not identical to NFIQ1 quality map with 

Relative number of enhanced quality map blocks that have an assigned value of 3 (similar but not identical to NFIQ1 quality map with 

Relative number of enhanced quality map blocks that have an assigned value of 4 (similar but not identical to NFIQ1 quality map with 

Number of foreground blocks based on the quality map computation (similar but not identical to NFIQ1 quality map with block size 8) 

Relative number of advanced quality map blocks that have an assigned value of 1 (similar but not identical to NFIQ1 quality map with 

Relative number of advanced quality map blocks that have an assigned value of 2 (similar but not identical to NFIQ1 quality map with 

Relative number of advanced quality map blocks that have an assigned value of 3 (similar but not identical to NFIQ1 quality map with 

Relative number of advanced quality map blocks that have an assigned value of 4 (similar but not identical to NFIQ1 quality map with 

Number of high flow blocks determined by the low flow map (block size 24 x 24) 

Gabor feature 

Gabor Shen feature 

Local Clarity Score (LCS) feature 

Orientation Certainty Level (OCL) feature based on Sobel filters 

Orientation Certainty Level (OCL) feature based on centered differences 

Ridge Valley Uniformity (RVU) feature with padding (block size 32) 

Ridge Valley Uniformity (RVU) feature without padding (block size 32) 

Orientation Flow (OF) feature 

Radial Power Spectrum (RPS) feature 

Frequency Domain Analysis (FDA) feature 

~100	 	 	 features ...
NFIQ	2.0	features	

1F 1O 1T 1Y 2B dermalog id3 pb R

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0.25

0.50

0.75

1.00

0

2

4

0.00

0.25

0.50

0.75

1.00

−0.2

−0.1

0.0

0.1

0.0

0.5

1.0

1.5

2.0

0.25

0.50

0.75

1.00

0

1

2

3

4

1

2

3

4

0.0

0.2

0.4

0.6

0.8

0.00

0.25

0.50

0.75

0.00

0.25

0.50

0.75

1.00

0.4

0.5

0.6

0.7

0.8

0.9

ocl rvu32 rps mmb gab msb ruv16 fda lcs gsh of gsg

1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10

Comparison score quantile.

Quality score
NFIQ	 	 	 2.0 :: performance	 	 	 per features

0.00 0.05 0.10 0.15 0.20 0.25 0.30 

0.07 0.08 0.09 0.10 0.11 

fraction of genuine comparisons rejected 

 Comparator 2B − Dataset poebva − Finger 02 

false non−match rate 

ocl rvu32 rps mmb gab msb rvu16 fda lcs gsh of 
	 	

	 	

MACHINE LEARNING

We examined:

Random forest	

Support	vector machine

K-nearest	neighbor
	 	

	 	

	 	 	

	 	

	 	 	 	 	

	 	 	 	

	 	 	 	

	 	 	

	 		 	 	

	 	 	 	 	

	 	 	 		

	 	 	 	 	

	 	

	 	 	 	 	 	

	 	 	 	 	

	 	 	 	 	 	

Machine Learning

Random Forest

» Ensemble classifier using

stochasKc process

• Use vote to determine class

memberships	

• Provides class probability in

predicKons	

• Analysis of features importance

and their ranking

• We used this to do our final

feature selecKon

Two class	predicFon

» High vs. Low performers

• 1: High performers are images that	

result	in high genuine scores

• > CDF-1(0.95)

• 0: Low performers are images that	

result	in false reject	

• Threshold at	FMR=0.0001

• Quality score is the probability that	a given

image belongs to class 1.

» Map quality score to recogniKon rate.
	 	 	 	 	 	

	 	 	 	 	 	 	 	 	 	 	

	 	 	

	 	 	

Training

Features: image processing +	#minuKae +	minuKae quality

~5000 samples in each of the low and high performers classes

1000 trees in forest	

Test	

30000 comparison scores

SO, DOES IT WORK?
0.00 

1.00 

0.00 1.00 

Probability of sample score > 90th percentile 

1F 1O 1T 1Y 2B dermalog id3 pb R 

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0.25 

0.50 

0.75 

1.00 

0.25 

0.50 

0.75 

0.00 

0.25 

0.50 

0.75 

azla dhs2 poebva 

1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 

Quantile 

NFIQ	 	 	 	 2.0 test –all features
0.00 1.00 

1.00 0.00 

Probability of sample score being

high quality 

1F 1O 1T 1Y dermalog pb 

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0.25 

0.50 

0.75 

1.00 

0.25 

0.50 

0.75 

0.00 

0.25 

0.50 

0.75 

azla dhs2 poebva 

1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 

Quantile 

	 	 		 	 	 	NFIQ 2.0 prototype

(current seleceKon of features)
0.00 0.02 0.04 0.06 0.08 0.10 

false non−match rate 

nfiq1 nfiq2 

0.0 0.2 0.4 0.6 0.8 1.0 

fraction of genuine comparisons rejected 

 Comparator 1O − Dataset azla − Finger 02 

1400

(0.953,1] 

(0.907,0.953] 1200

(0.86,0.907] 

(0.628,0.698] 

600

Verification Random Forest 

(0.806,0.86] 1000

(0.752,0.806]

(0.698,0.752] 800

(0.55,0.628]

(0.457,0.55] 

400

(0.333,0.457] 

200 (0.171,0.333]

(0,0.171] 

(0,0.171]

(0.171,0.333](0.333,0.457]

(0.457,0.55](0.55,0.628]

(0.628,0.698](0.698,0.752](0.752,0.806]

(0.806,0.86](0.86,0.907]

(0.907,0.953]

(0.953,1] 

10000 (0.953,1] 

(0.907,0.953] 9000 

(0.86,0.907] 

6000 (0.628,0.698] 

8000 (0.806,0.86] 

(0.752,0.806] 7000 

(0.698,0.752] 

(0.55,0.628] 5000 

(0.457,0.55] 

4000 (0.333,0.457] 

(0.171,0.333] 3000 

(0,0.171] 

(0,0.171]

(0.171,0.333](0.333,0.457]

(0.457,0.55](0.55,0.628]

(0.628,0.698](0.698,0.752](0.752,0.806]

(0.806,0.86](0.86,0.907]

(0.907,0.953]

(0.953,1]

Verification Random Forest 

	 	 	

		

	 	 	 		

	 	 	

	 	 	 	

	 		

	 	 	 	

			

	 	 		

	 	 	 		

	 	 	 	 	

	 	 	 	

	 	

NFIQ 2.0 prototype performance

Features:

Gabor

Gabor Shen

Local Clarity Score (LCS)

OrientaKon Certainty Level

(OCL)

Ridge Valley Uniformity (RVU)

w/o padding

Ridge Valley Uniformity with

padding

OrientaKon Flow (OF)

Radial Power Spectrum (RPS)

MinuKa	count	

MinuKae quality based on Mu

MinuKa	quality based on OCL

Enrolment Random Forest Enrolment Random Forest 

ROI	(foreground size)
ACTIONABLE	 	 QUALITY
	 	

	 	

	 	

	 	

	 	 	 	

	 	 	 	

AcKonable quality

Feed back	to user/operator

	 	

	 		

	 	 	 	 	

	 	

	 	 	 	

QuesFons?

» Sensor sensiKvity?

» Algorithm sensiKvity?

» Already covered by features?

» Any addiKon or deleKon?

• Fingerness?

• Alteredness?

• correctness of phalanx?

»

•

•

»

•

»

•

»

Wet	/ dry

High/low pressure

MS Thesis (M. Dusio,	C. Busch)

Centeredness

Singularity detecKon

Incompleteness

Entropy of orientaKon flow

Ghost	images
NFIQ	2.0	 	 	 LITE (MOBILE)
ra

Activation histogram

Activation hist m

Comparison

scores

Train Sel Train Training set f-organizing SOM Codebook

ogra 

Random forest

map ndom forest

Validation

set

Test Predicted 

set comparison score

	 	 	

	 	

	 	

	 	 	

	 	

	 	

	 	

	 	 	 	 	

	 	 	 	 	

NFIQ 2.0 Lite/Mobile

Requirements SOM	

» Low computaKon complexity » Unsupervised clustering (unlabelled

training data) • processing power

• Processing	Kme » Training phase

• IteraKvely present	training vectors to

build clusters (codebook vectors) » Therefore, feature computaKon

not	feasible! » PredicKon phase

» Look up table? • Input	vector is assigned a	class based

on distance to learned clusters

» Topology preserving - similar classes

will have similar spaKal locaKons in

the map
	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	

	 	 	 	 	 	 	 	 	 	 	 	 	

	 	 	

	 	

Self organizing maps

M. Olsen, E. Tabassi, A. Makarov, C. Busch: „Self-Organizing Maps for Fingerprint	Image Quality Assessment“, in Proceedings of the

26th Conference on Computer Vision and Pa:ern RecogniKon (CVPR	2013), June 23-28, Portland, Oregon, (2013)

SOM	code book
SOM	unsupervised	 	 training
	 	 	 	 	

	 	

A A A A A

A B C D A

A E C D A

A E C C A

Divide fingerprint	image

into blocks and look up

nearest	cluster to get	a

label

Finger image is

transformed into

cluster histogram

Quality Score Random Forest	

Self organizing maps for NFIQ2.0 Lite-1

20130623 25
5

4 

Verification Quality 

1 2 3 4 5 

2.4 

2.2 

2.0 

1.8 

3 

1.6 

2 

1 

Enrolment Quality 

1.4 

1.2 

1.0 

0.75 

5 0.70 

0.65 

4 

1 2 3 4 5 

Verification Quality 

3 

0.60 

0.55 

0.50 

2 0.45 

0.40 

1 

0.35 

Enrolment Quality 

	 	 	 	

−0.0050

−0.0025

0.0000

0.0025

Difference 

0 128 256 384 512 640 768 896 1024 

SOM Unit 

NFIQ 2.0 Lite prototype

Features performance

0.0000 

0.0025 

0.0050 

0.0075 

0.0000 

0.0025 

0.0050 

0.0075 

High Lo w 

0 128 256 384 512 640 768 896 1024 

SOM Unit 

0.00 0.05 0.10 0.15 0.20 0.25 0.30 

0.070 0.080 0.090 0.100 

fraction of genuine comparisons rejected 

false non−match rate 

network size 24 network size 32 network size 64 orientationFlow 
	 	 	 	

	 	

	 	 	 	 	 		

	 	 	 	 		

	 	 	 	 		

	 	 	

	 		

	 	 	 	 	 		

	 	 	 	 		

	 	 	 	 		

	 	 	 	 	 	

	 		

	 	 	 	 	

	 	 	 	 	

	 	 	 	

		 	 	 	 	

	 	

	 	 	 	 	 		

	 	 	 	 	 	 	

	 	 	 	 	 	

NFIQ 2.0 computaKon Kme

Lite

» ~ 65 ms/image

• PC - 2.3 GHz	Intel Core i7

• 16 GB of	memory.

• network size of dim =	24

• block size of n =	24

• With gray scale normalizaKon

» ~ 82 ms/image.

• PC - 2.3 GHz	Intel Core i7

• 16 GB of	memory.

• network size of dim =	24

• block size of n =	64

» This is prior to any code

opKmizaKon

NFIQ	2.0

» Feature computaKon Kme

» ~ 19.45 msec/image for OCL - Expect	

about	the same for other features

• MacBook Air, Mid 2011

• Processor: 1.7 GHz	Intel Core i5

(dual core)

• Memory : 4 GB 1333 MHz	DDR3

(256 KB L2 cache, 3MB L3 cache)

• Soxware:		OS X	10.8.3 (12D78)

» ~85 msec/image for MinuKa	based

features

» This is prior to any code

opKmizaKon
	 		

	 	 	 	

	 	 	 	 	 	

	 	 	

	 	 	 	 	

	 	 	

	 	 	

	 	 	

	 	 	 	

	 	 	 	 	 	 	 	 	 	

	 	 	 	 	 	

	 		

	 	 	

	 	 	

	 	 	

	 	 	 	 	 	 	 	 	

	 	 	

	 	 	 	 	 	

	 	 	 	 	 	

	 	 	

Current	Status

Completed

» Framework design

• Modular, plug and play

» Framework implementaKon

» Feature selecKon and prototype

implementaKon complete

• h:p://biometrics.nist.gov/cs_links/quality/

NFIQ_2/NFIQ-2_Quality_Feature_DefinVer05.pdf

» Feature evaluaKon complete.

» Feature ImplementaKon - MATLAB to to

C/C++	

• Thanks to FBI	+ MITRE

» Exploring machine learning

• Random forest, SVM.

» Feature selecKon (almost	– conKngent	on

their computaKon Kme).

» ImplementaKon of acKonable flags for

detecKon and miKgaKon of bad

presentaKons

• Incomplete finger (Kp, etc.) +	Wet	/ dry +	

Pressure	

Underway	

» Finalizing training

• Axer this workshop

» NFIQ 2.0 Lite

• Self organizing map

» EvaluaKon of ImplementaKon of

acKonable flags for detecKon and

miKgaKon of bad presentaKons

• Incomplete finger (Kp, etc.) +	Wet	/ dry +	

Pressure	

• But, tricky –	since we do not	have

groundtruth for this.

» Mapping of NFIQ 2.0 à NFIQ 1.0
	 	

	 	

	 	 	

	 	

	 	

	 	 	

	 	

	 	

	 	

	 	

	 	 	

	 	 	

	 	

	 	 	

	 	 	

	 	 		

NFIQ 2.0

Promises,	promises	 So far,	we have achieved	

» Improved feature

» More level (0-100)

» Faster, lighter

» AcKonable feedback

» NFIQ 2.0 mobile

» Slap

» Be:er performance

» Modular design

» CalibraKon

» Conformance tesKng

» Improved feature

» Standard features

» More level (0-100)

» Faster –	we hope

» AcKonable feedback

» Towards NFIQ Mobile

» --

» Be:er performance –	we hope

» Plug and play
	 	 	

	 	 		 	

	 	 	 	 	

	 	

	 	 	

	 	 		

	 	 	

	 	 		

	 	 	

	 	 	 		

	 	 	 	 		

	 	

	 	 	 	 	 	

StandardizaKon - then

ISO/IEC IS	29794-1:2009	 5-byte Quality Block	

» InformaKon technology -

Biometrics sample quality Part	1:

Framework

» DefiniKons	

• quality: "the degree to which a	

biometric sample fulfils specified	

requirements for a	targeted

applicaKon"

• quality score: "a	quanKtaKve

expression of quality"

• uKlity: "the observed

performance of a	

biometric sample or set	of

samples in one or more

biometric systems"

» Quality score from 0 to 100
Vector	of	quality components	

	 	 	

	 	 		 	

	 	 	 	 	

	 	 	

	 	 	

	 	 	 	

	 	 	 	 	 	

StandardizaKon - now

ISO/IEC 29794-1:201X	

» InformaKon technology -

Biometrics sample quality Part	1:

Framework

» DefiniKons	

• Same as before, but	allow for a	

vector of quality components

• Goal: AcKonable quality

» Each element	of quality vector

has a	score from 0 to 100.
	 	 	 	 	

	 	 	

	 	

	 	 	

	 	 	 	

	 	

	 		

features for implementaKons

that	saKsfy semanKc

conformance to the

requirements of the ISO/IEC

29794-4 standard

	 	 	 	

Support	standardizaKon of finger image quality

ISO/IEC 29694-4	

» Provide quanKtaKve support	to

development	of InformaKon

technology –	Biometric sample

quality –	Part	4: Finger image

• Currently at	2nd working drax

» Contribute feature computaKon

method +	codes

• Allows for plug-and-play of
	 	

Thank	You.

Elham Tabassi

301 975 5292

tabassi@nist.gov
	 	

	 	

	 	

	 	 		

Panel Discussion

» Greg Cannon (CrossMatch)	

» John Dowden (NEC)	

» Anne Wang (3M	Cogent)

» Timo Ruhland (BKA)	

» Jean Christophe FONDEUR	(MORPHO)

• the main advantage of NFIQ –by far- is that	it	is universal and common to all, so I	clearly recommend

that	we keep this universality for NFIQ 2 and hence have no opKon in the definiKon. NFIQ score on a	

given image should remain an absolute and universal value.