Embed Size (px)
Citation preview
Thermal imaging of ear biometrics
Steinar Watne
• Outline– Introduction to biometrics– Ear as biometric– Research questions– Experiment– Pre-processing– Preliminary results– Conclusion
Thermal imaging of ear biometrics
• Introduction to biometrics
– Authentication• Airports• ATM• Buildings• Computer systems
– Claiming identity and providing proof
Thermal imaging of ear biometrics
• Introduction to biometrics cont. (Proofs)– Something you have
• Key• Token• Smart card
– Something you know• Password• PIN code
– Accepted or rejected
Thermal imaging of ear biometrics
• Introduction to biometrics cont. (Proofs)– Something you are
• Behavioral– Gait– Signature
• Physiological– Fingerprint– Iris– Ear
– Never 100% match
Thermal imaging of ear biometrics
• Ear as biometric
– Physiological• Feature capture
– Normal images– Thermal images– Ear prints for criminal records
– Seven characteristics
Thermal imaging of ear biometrics
• Ear as biometric cont. (Characteristics)– Universality – Permanence – Collectability– Performance– Acceptability– Circumvention– Uniqueness
Thermal imaging of ear biometrics
• Research questions
– What techniques do already exist for ear authentication?
– How good are our results using thermal images compared to results using existing methods?
Thermal imaging of ear biometrics
• Research questions cont.
– Is it possible to determine differences in peoples ears by looking at a thermal image?
– Do environmental factors, e.g. temperature, affect our results in any way?
Thermal imaging of ear biometrics
• Research questions cont. (Motivation)
– Burge et al. propose thermal images• Difference in temperature• Easy to mask hair away
Thermal imaging of ear biometrics
• Experiment (Main)
– 75 participants• 15 images
– 3 sessions
– Right ear– Temperature
Thermal imaging of ear biometrics
• Experiment (Main) cont.– Age
• 19-65 yrs.
– Gender• 11 female
– Mean age: 27 yrs.– Std. dev. 9
• 64 male– Mean age: 28 yrs.– Std. dev. 9
Thermal imaging of ear biometrics
• Experiment (Sub)
– 5 Participants• Cooled ears (10 minutes)• 2 initial images• Images taken each 15 seconds for 15 minutes (61 total)
– How much time is needed before the ear is back to “normal”?
Thermal imaging of ear biometrics
• Pre-processing
– SmartView• Palette• Scale selection
– MatLab• Axis• Rotation• Cropping/resizing
Thermal imaging of ear biometrics
• Pre-processing cont.
– SmartView• Palette• Scale selection
– MatLab• Axis• Rotation• Cropping/resizing
Thermal imaging of ear biometrics
• Pre-processing cont.
– SmartView• Palette• Scale selection
– MatLab• Axis• Rotation• Cropping/resizing
Thermal imaging of ear biometrics
• Pre-processing cont.
– SmartView• Palette• Scale selection
– MatLab• Axis• Rotation• Cropping/resizing
Thermal imaging of ear biometrics
• Pre-processing cont.
– SmartView• Palette• Scale selection
– MatLab• Axis• Rotation• Cropping/resizing
Thermal imaging of ear biometrics
• Pre-processing cont.
– SmartView• Palette• Scale selection
– MatLab• Axis• Rotation• Cropping/resizing
Thermal imaging of ear biometrics
• Preliminary results
– Commercial products• Image Comparer• ImageFinder• Weka
– Algorithmic approaches• PCA• Distance metrics
Thermal imaging of ear biometrics
• Preliminary results
– Image Comparer• Threshold at 70%• Not complete scores• What is going on behind the scenes?
Thermal imaging of ear biometrics
• Preliminary results– Image Comparer
Thermal imaging of ear biometrics
FAR
Threshold Threshold
FRR
• Preliminary results
– ImageFinder• Different filters• Difficult to tune• What is going on behind the scenes?• EER
– 30% visual– 31% high contrast– 36% grayscale
Thermal imaging of ear biometrics
• Preliminary results– ImageFinder
Thermal imaging of ear biometrics
High contrast Gray scaleVisual
• Conclusion– Burge et al. does not seem to hold– Preliminary results
Thermal imaging of ear biometrics
