Biometrics and Security

Tutorial 8

• 1 (a) Understand the enrollment and verification of hand geometry? (P9: 8)

• 1 (b) Please check the definition of deviation in P9:16

12 12 12,x yP P P

1 1 1,x yP P P

14 14 14,x yP P P

d eviatio n

Y

X (0 .0 )

D (D x,D y)

1 14 1

1 14 1

1 14 1

12 1 14 1

14 112 1 1

14 1

14 112 1

14 1

12

x x xx

y y yy

x x xxy y y y

x xy y x

x y y

x xy y

x y y

xx

D P P P

D P P P

D P P P

P P P P

P PD P P P

P P

P PD P P

P P

deviation P D

• 1 (c) List the differences between the Raul Sanchez-Reillo’s approach and A.K. Jain’s approach. (P9:10-21)

• Image capture of Raul

• Image capture of Jain

• Features defined by Raul

• Features defined by Jain

• Feature selection of Raul

• Feature selection of Jain

• 1 (d) What are the advantages and disadvantages of hand geometry? (P9: 28)

• 1 (e) Understand Gaussian Mixture Modelling (GMM), Pre-processing and feature extraction (P9:22-23)

• 2. There are 31 features of hand geometry in Raul Sanchez-Reillo’s approach. Please try to list them. (P9:12-18)

• 3. As a general 3D hand geometry approach introduced in P9:5-9, there are 14 features defined. The matching score: Euclidean distance can be defined by

•

• Please try to make a figure like P8:37 (Euclidean Dis. – Percent).

142

1

( )i i

i

x y

• 4. In A.K. Jain’s approach, there are sixteen axes along which feature values are computed. Please try to define the corresponding hand features. (P9:21)

• Let F = (f1; f2; … ; fd) represent the d -dimensional feature vector

• (65 53 59 52 62 47 47 45 255 333 253 287 243 149 )

• 5. There are five steps defined by a finger recognition system (P9: 32-36). What kinds of features are used in this system?

• (joint line) • Do you have any idea to compare two

templates exactly? • (shift to the best match)• Based on the given input image in Q3

(Tutorial 4), we project it to the i-axis. What is its one-dimensional data? (17, 24, 43, 28, 45)

4 4 7 1 9

4 3 8 2 9

3 5 9 8 9

3 6 9 8 9

3 6 10 9 9

4 4 7 1 9 25

4 3 8 2 9 26

3 5 9 8 9 34

3 6 9 8 9 35

3 6 10 9 9 37

17 24 43 28 45