Biometrics and Machine Learning Group
Latest news
We are pleased to announce that Mateusz Trokielewicz defended (with honors) his doctoral dissertation entitled „Iris Recognition Methods Resistant to Biological Changes in the Eye” , supervised by prof. Czajka and prof. Pacut, on the 18th of July, 2019.
Iris scanner can distinguish dead eyeballs from living ones: MIT Technology Review reports on our recent developements in the field of presentation attack detection for cadaver irises.
We are pleased to announce that Mateusz Trokielewicz received the EAB European Biometrics Research Award 2016 for research on iris recognition reliability including template aging, influence of eye diseases and post-mortem recognition.
Is That Eyeball Dead or Alive? Adam Czajka discusses the prevention of iris sensors accepting the use of a high-resolution photo of an iris or, in a grislier scenario, an actual eyeball. For full article, please see IEEE Spectrum.
Biometrics (CSE 40537 / 60537)
back to Biometrics (CSE 40537/60537)
Quizzes
How to solve quizzes?
- Send your answers to aczajka@nd.edu by the date indicated in each quiz. Please send your answers in plain text and don't use Word or PDF attachments (unless it is necessary).
- Provide your name or your netID in the email so that I can identify the author.
- Send your answer quickly. If it is incorrect, we will have some time to develop a correct answer until the deadline.
- We will discuss shortly the correct answers is class (after the deadline).
Quiz No. 8
Send your answers by Monday, 5/1/2017, 11:59 PM
- Which technique provides a better security of biometric references:
- match-on-card
- match-off-card
- The area under the DET curve for an ideal biometric system (i.e., achieving EER=0) is: .....
- Identification rate at rank N for the closed-set identification system with N persons enrolled is: .....
Quiz No. 7
Send your answers by Thursday, 4/20/2017, 11:59 PM
- Assume that someone prepared a 3D mask of your face and presents it to the camera. Which countermeasure helps to make your system more robust against this attack:
- Tamper-proof case of a biometric sensor
- Presentation attack detection
- Watermarking of digital images generated by the sensor
- Is it possible (in theory) to find two irises that have identical iris code? (YES / NO)
- Which approach prevents from a successful hill climbing attack:
- Use of multiple characteristics (e.g., iris + face) in the same system
- Storing pseudonymous identifiers in the database instead of regular reference templates
- Returning only binary decisions (match / non-match) from the matching subsystem instead of the comparison score
Quiz No. 6
Send your answers by Monday, 4/10/2017, 11:59 PM
- “Formants” in biometrics are:
- Quantities used to describe the properties of a human vocal track
- Characteristic quantities of the vocal cord sound
- The title of Lucier’s famous composition
- Mel-frequency scale:
- Explains better than a linear scale the nature of how we (humans) hear the sounds
- There is only one and universal mel-scale (independent of the population)
- Since the name “mel” originates from “melody” this scale is used in all opera performances
Quiz No. 5
Questions (PDF)
Send your answers by Thursday, 3/30/2017, 11:59 PM
Quiz No. 4
Send your answers by Friday, 3/10/2017, 11:59 PM
- Which information is better for recognition of thermal images of a hand:
- average temperature of your entire hand
- relative temperatures measured in different parts of a hand
- Different geometrical features of our hand have different variance. Which metric is better to calculate a distance between biometric samples in this case:
- Mahalanobis
- Euclidean
Quiz No. 3
Send your (short) answers by Monday, 3/6/2017, 11:59 PM
Quiz No. 2
Send your answers by Thursday, 2/9/2017, 11:59 PM
- Bifurcation is:
- a singular point
- a basic minutia
- a level-three feature
- Assume that Poincaré index is zero for all tested local areas of our fingerprint image. The Henry's class of this fingerprint is:
- whorl
- double loop
- plain arch
Quiz No. 1
Send your answers by Thursday, 1/26/2017, 11:59 PM
- Imagine that we decided to use biometric recognition in a border control system. Is DNA a good biometric modality in this application? Provide the pros and cons.
- We have tested two biometric methods: A and B. The following error estimators were obtained: FNMRA=0.1, FMRA=0.02, FNMRB=0.01, FMRB=0.2. Which method would be better for applications requiring high security?