FBI Fingerprint Scanner Certification Program
FBI Fingerprint Scanner Certification Program
FBI Fingerprint Scanner Certification Program
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<strong>FBI</strong> <strong>Fingerprint</strong> <strong>Scanner</strong><br />
<strong>Certification</strong> <strong>Program</strong><br />
NIST Biometric Quality Workshop<br />
March, 2006<br />
Tom Hopper <strong>FBI</strong><br />
Norm Nill MITRE<br />
1
The Plan<br />
• Identification requirement in engineering terms<br />
– Latent Print Comparison - AFIS<br />
• Support procurements<br />
• Test performance (not design)<br />
• Don’t delay vendors<br />
• Don’t drive up costs<br />
2
<strong>Fingerprint</strong> <strong>Scanner</strong><br />
<strong>Certification</strong><br />
• Negotiated Test Plan (FIR, IC…)<br />
• Core Requirements<br />
• Identification Flats<br />
• Single Finger <strong>Scanner</strong>s<br />
3
e-<strong>Fingerprint</strong><br />
ANSI/NIST<br />
Tagged Field<br />
Data Format<br />
500 ppi<br />
256 gray levels<br />
Versioning<br />
XML<br />
Header 1<br />
Descriptive<br />
Data 2<br />
Electronic FP<br />
Transmission<br />
Specification (EFTS)<br />
Required Fields<br />
Service Agreement<br />
WSQ<br />
Compression<br />
CERTIFICATION<br />
MugShot<br />
4<br />
10<br />
Image Quality Spec<br />
<strong>Scanner</strong> Requirements<br />
CERTIFICATION<br />
Best Practice<br />
4
Quality -> Accuracy<br />
5
False Minutiae<br />
6
Quality Trends<br />
IMAGE QUALITY<br />
SUBMISSIONS vs. MASTER FILE<br />
2.00%<br />
1.80%<br />
PERCENTAGE DISTRIBUTION<br />
1.60%<br />
1.40%<br />
1.20%<br />
1.00%<br />
0.80%<br />
0.60%<br />
0.40%<br />
0.20%<br />
0.00%<br />
0<br />
9<br />
18<br />
27<br />
36<br />
45<br />
54<br />
63<br />
72<br />
81<br />
90<br />
99<br />
108<br />
117<br />
126<br />
135<br />
144<br />
153<br />
162<br />
MATCHER QUALITY INDEX VALUE<br />
SUBMISSIONS<br />
MASTER FILE<br />
7
<strong>Scanner</strong> <strong>Certification</strong><br />
Specifications<br />
IQ Parameter: Description: F Spec (G Spec)<br />
Geometric<br />
Integrity<br />
max error in pixels<br />
A: 1.2 (1.8)<br />
B: 0.3 (0.5)<br />
(pixel = 0.051 mm)<br />
Scale pixels per inch 500 ± 5 ppi<br />
Modulation<br />
Transfer<br />
Function (MTF)<br />
- resolution<br />
- detail sharpness<br />
- spatial freq. response<br />
B<br />
A<br />
1.0<br />
Modulation<br />
MTF<br />
cy/mm<br />
min MTF @ 5 cy/mm<br />
51%<br />
( 44%)<br />
Linearity<br />
Image<br />
Gray<br />
•<br />
•<br />
••<br />
•<br />
•<br />
••<br />
•<br />
Tgt Reflectance<br />
< 7.65 gray deviation<br />
from straight line<br />
8
<strong>Scanner</strong> Requirements<br />
IQ Parameter: Description: F Spec (G Spec)<br />
Noise<br />
standard deviation (σ )of<br />
gray level fluctuations<br />
on uniform White & Black tgts<br />
W ! B<br />
" W<br />
, W ! B<br />
" B<br />
> 125<br />
Gray Uniformity<br />
row-to-row, col-to-col,<br />
area-to-pixel,<br />
area-to-area,<br />
on uniform white & black tgts<br />
max gray level<br />
deltas established<br />
for white & black<br />
Gray Scale Range<br />
of <strong>Fingerprint</strong>s<br />
number of gray levels in<br />
light, medium, & dark-inked<br />
ten-print card test set<br />
80% > 200 grays<br />
(80% > 150 grays)<br />
9
Identification Flats<br />
10
Identification Flats<br />
Additional Requirements<br />
• Simple Capture Protocol<br />
• No Finger Sequence Errors<br />
3.2 x 3.0 platen<br />
11
Single Finger <strong>Scanner</strong><br />
EFTS Appx. G<br />
• Defined in NIST SP800-76 (PIV)<br />
– min capture size 12.8 x 16.5 mm<br />
– native resolution at least 500 ppi<br />
• Modify current G spec:<br />
– new levels for new sensor types & application<br />
– greater focus on AFIS requirements<br />
• Your thoughts<br />
nbnill_at_mitre.org<br />
thopper_at_leo.gov<br />
12
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