Evaluation of Latent Fingerprint Technologies (ELFT)
Transcript of Evaluation of Latent Fingerprint Technologies (ELFT)
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Evaluation of Latent Fingerprint Technologies (ELFT)
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What are Latents?
Ubiquitous (found on almost all surfaces)
Residual marks from fingers & palms
… but from Very High Value Subjects
Arbitrarily poor quality
Also toe and footprints (all friction ridge skin)
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Conventional Fingerprints (not latents)
Rolls
Slaps (Flats)
Rolls
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Captured Fingerprints
Flat impression
Latent Fingerprint (powder lift) Rolled Impression
Latent vs. Conventional Prints
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Why Are Latents Difficult?
Tips Smudges Weathering
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Why Are Latents Important?
Homeland Security
Military & Intelligence Law Enforcement / Criminal Justice
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List of Candidates
Output
Rank Subject
ID
Candidate
1 0733091
2 1304033
3 3952340
…
20 0847121
Automated Fingerprint Identification System
(AFIS)
Latent Examiner
Image + features (for comparison)
Ma
rk
Image + features (for search)
Input
Ma
rk
Mark
/ C
om
pare
Latent Examiner
Ma
rk / C
om
pa
re
Mrk
/Co
mp
Match
Latent AFIS Technology
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Latent AFIS Technology Problems?
Manual workload …
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Indeterminate
Bifurcation
AFIS ID step: Manual Feature Markup
Core
Core
Ridge
ending
Examiner & Workstation
Latent Workstation Screenshot
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Latent AFIS Technology Problems?
Manual processing …
Accuracy …
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0
10
20
30
40
50
60
70
80
90
100
�Identification Rate (%)
Conventional AFIS
Latent AFIS
37%
Conventional vs. Latent ID Rates
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Latent AFIS Technology Problems?
Manual processing …
Accuracy …
Interoperability …
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AFIS Interoperability: Now
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AFIS Interoperability: Future
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Core
Indeterminate
Incipient
Pore Core
Ridge
ending
Protrusion
Bifurcation
Improved Feature Quality o ridge quality map
Improved Feature Set: o endings/bifurcations
Dot
o pores
o protrusions
o incipient ridges
o dots
o creases
o scars
o skeleton
Extended Feature Set (EFS)
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What is ELFT?
• Open evaluation of Automated Latent Fingerprint Identification Systems (AFIS) using automatic feature extraction and matching and standardized features hand-marked by human experts (EFS).
• Interactive effort between NIST and latent AFIS community to improve accuracy, promote interoperability, and reduce reliance on human examiners.
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Acquire Latent
Matchers (SDKs)
Configure Hardware
Compile Latent Test Sets
ELFT Testing Architecture
o Execute 1-to-Many searches
• Image-only searches
• Examiner-assisted searches
(image + feature markup)
• Operational images
• Extended Feature Sets
o Measure & Analyze Results
• Accuracy
• Selectivity
• Resource requirements
• Gap analysis
Iterate process
1. Evaluation Reports
2. Feedback to Standardization
3. Technological Gap Analysis
4. Reference Data
Evaluation Protocol
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2006 NIST Latent Fingerprint Testing Workshop
2007 ELFT Phase I Evaluation
2008 ELFT Phase II Evaluation
2009 NIST Latent Fingerprint Testing Workshop ELFT Phase II Miss Analysis Sessions ELFT-EFS Public Challenge
2010 ELFT-EFS Evaluation #1 ELFT-EFS Miss Analysis Sessions
2011 ELFT-EFS Evaluation #2
ELFT History
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Measured Accuracy Improvement
(ELFT-EFS 1 vs. 2)
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Customers and Community
Industry Academia
Developers & Researchers:
• Measurement & failure analysis
• Reference data
Government Law Enforcement
• Standards
Users & Practitioners:
• Performance rankings
• System integration & tuning
• Standards
• Conferences, Journals
• Conferences, Workshops
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Path Forward
Develop best practices to reduce manual workload • lights-out processing of some operational workload • searching and encoding strategies • quality metrics
Evaluate state-of-the-art latent fingerprint and (new) palmprint AFIS • interoperability testing (LITS/EFS profiles) • matcher and data fusion • candidate reduction techniques
Expand scale of ELFT testing
•operational scale tests •operational vs. research algorithms
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Questions?