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Tools for Iris Recognition Engines

Martin George – CEO

Smart Sensors Limited (UK)

© Smart Sensors Ltd, 2009. Company proprietary – please do not distribute without permission2

About Smart Sensors Limited

Owns and develops Intellectual Property for image recognition, identification and analytics applications

Primarily applied (to date) in the form of software development tools and know-how for iris biometrics (algorithms and recognition engines)

We work with camera manufacturers and systems integrators, aiming to be “agnostic” to image source

“Small footprint” methods give rapid performance and ability to scale to many different processor platforms (PC, PDA, Linux, DSP)

MIRLIN = Monro Iris Recognition Library and INterface, based on work of Prof. Don Monro (University of Bath, UK)

Very competitive performance

Changing the iris biometrics business model to one that makes economic sense for developers and end-users

Implementations and licence terms that open up volume markets


Key benefits of Iris Recognition

Fundamentally simpleØ A digital photo of the eye, using night-vision illumination

(Near Infra-Red = NIR)

Exceptional discrimination powerØ Excellent for IDENTIFICATION applicationsØ De-duplication in large scale enrolment programs

Non-contact, hands-free usageØ Non-intrusive, Convenient, Versatile

Good where fingerprints are not goodØ Low and high humidity, manual workers, elderly, …


Myth-busting

Iris Scanning No “scanning” is involved. A simple digital photo of the eye surface is taken, using a low level of near-infra red light.

Doesn’t it use lasers? No. The illuminators are Light Emitting Diodes (LEDs), and are just below the visible spectrum – very similar to night vision cameras.

Intrusively images the back of the eye

That is for retinal recognition. Iris recognition should not be confused in any way with retinal recognition.

The iris changes if you’re ill

Iris recognition biometrics looks at the fibrous tissue structure of the iris, which is fully stable a few months after birth. Iridology (the alternative health practice of recognising illness from the iris) has not been proven in any medical studies, and moreover relates to colour.

Identical twins have similar eyes

The fibrous tissue of the iris develops in a completely random way, and is not genetically dependent. Identical twins have different irises (as indeed are left and right eyes).

You will already be well aware of these issues, but in our experience public users and some deployers still have misperceptions of iris biometrics:


Localization

Normalization

Feature Extraction

EnrolledDatabase

ClassifierMatch

PASSor

Divert

Extract Eye Image,Pupil/Iris segmentation

Feature Vector(Template)

Image Enhanced

Typical Iris Recognition system process

User passing through

Decision Watchlist

Read enrolled template or interoperable image

(e.g. IREX Kind 7) from Card/Credential

*

*

* Please note these intermediate images are a proprietary format, and not derived from IREX Kind 16 or 48


MIRLIN - Basic Features

Proprietary transform, Rapid Iris/Pupil finder, Rotation compensation, Specularity masking/scrubbing

Quality metrics enable rapid image assessment before computing resource is spent on image segmentation

Optimised for images acquired with NIR light sources: 720 – 900nm, >0.5 mW/cm2 irradiance

Iris image resolution conforming to ISO/IEC 19794-6Ø Minimum (in current image standard): 100 pixelsØ Recommended for optimum performance: 200 pixels+

Fast template matching based on Hamming DistanceØ Uses simple XOR logicØ Typically 500,000 matches per second with common PC

server configurations. Much more with hardware accelerator


Target applications

Physical access control (PAC): Non-contactØ Building Access and Security Policy Management SystemØ Time and Attendance

Logical Access ControlØ Security of access for workstationsØ Links easily with PAC and Building Management systemsØ Ideal for Access Hierarchy and Policy setting systems that

are based on presence of particular individual(s)

Border control and Frequent Traveller ProgramsØ Use with large databases and watch lists, no contact needed

Military, Security, Emergency and Law Enforcement forcesØ Mobile units with credential readersØ Force protection, Base access, ID on the move


Liveness Detection andSpoof Counter-measures

Video frame rate image processing and template creation enables real-time liveness checks via pupil and template dynamics

Frame-rate measurements of pupil position, size and pupil/iris ratio

Synchronize illumination changes with detection of pupil behaviour

Blink detection

Printed pattern contact lenses if not transparent to NIR detected via anomalies in dynamic template creation

Dilation drops alter iris texture behaviour as well as causing abnormal iris/pupil size ratio


MIRLIN Iris Analyst™

Import and Review iris image databases; image normalisation

Create ROC and DET charts with data output to .CSV

Analysis of six image metrics: Ø Average grey levelØ ContrastØ SaturationØ Signal-noise ratioØ Sharpness assessmentØ Occlusion

Binning of performance data according to image metrics scores


New techniquesA second set of data from the same iris image

Different error profile compared to spatial frequency domain techniques (almost all others)

Offers “dispute resolution” potential on very large databases or identification applications

Works on segmented images (i.e. requires iris texture only)

Non-match Match


New techniques – Fast database matching

For rapid matching within very large databases

Exploits proprietary template indexing techniques

2,500 class look-ups/sec, on ANY database size

Example: 4TB RAM holds ~50M indexed ID records, and can support 2,500 ID queries/second run by a single PC

Can be used with other binary templates (e.g. fingerprints)

Based on Smart Sensors’ US patent applications:

Fast Database MatchingØ 23 October 2006, ASN 11/585,365. Publication no. 20080097992

Fuzzy Database MatchingØ 23 October 2006, ASN 11/585,358. Publication no. 20080097983


Partner examples: Stand-off Iris CaptureSarnoff Iris On the Move™

• Require minimal user co-operation

• Cope with glasses, contact lenses, etc.

• Opportunity to integrate facial recognition

• Identification mode - no contact needed

• Handle 20 people per minute throughput

• Optics and photon budget MUST be right!

• Iris feature processing near frame rate

• Adaptive Optics puts the icing on the cake

Requirements of Stand-Off Iris Capture

AOptixInSight™: at 1.5-3m distance!

MIRLIN compatible and demonstrated with these systems: the default option with InSight™


Partner examples: Datastrip Mobile ID

Runs on Windows CE

Typical 0.9s iris enrolment

Auto iris capture

On-board capacity for 4000 data records, with local 4000:1 ID Match (all three biometrics)

Wireless communication to server for unlimited external template comparison capacity

New DSV2+ Turbo Multimodal mobile reader incorporates MIRLIN Iris Recognition Engine with TRIAD application software


Partner examples: Vista Imaging

USB 2.0 interface

Provides video image stream

Automatic iris capture mode

Standard camera tripod mount

“Cold” mirror enables easyself-acquisition of images

Ultrasonic auto-range sensor

MT2: Multi-modal with iriscamera, face camera andoptical fingerprint sensors

FA2: Combination Iris andFace camera (separate sensors)

Full audio interface (mic+spkr)

MT2: Multi-modal biometric acquisition unit for handheld or mounted use by operator, or by user

FA2:Compact iris/face acquisition module for door-mounted, tripod, or hand-held operation (actual size 93 x 93 x 50mm)


Smart Sensors Capability Summary

Iris/Pupil finderØ very rapid location of iris and pupil – coordinate outputØ ideal for camera developers

MIRLIN SDK - fully featured software toolkit Ø for iris recognition engines and back-end ID server systemsØ excellent cross-platform support

Bath Iris Image DatabaseØ up to 800 people / 1600 eyes / 32,000 imagesØ ideal resource for test and evaluation

MIRLIN Iris Analyst™Ø integrated suite of tools that generates ROC/DET curves and

bins images according to quality metrics vs. performance


Contact Details

Further information available from:

Ø Smart Sensors LimitedCarpenter House Innovation CentreBATH, BA1 1UDUnited Kingdom

Tel: +44 (0) 1225 388690

Martin George – [email protected]

mailto:[email protected]

tools for iris recognition engines - planet · pdf filetools for iris recognition engines...

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