Biometrics & Security Tutorial 6. 1 (a) Understand why use face (P7: 3-4) and face recognition system (P7: 5-10)

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Presentation transcript:

Biometrics & Security Tutorial 6

1 (a) Understand why use face (P7: 3-4) and face recognition system (P7: 5-10)

1 (b) Please point out some problems of face recognition. Can you give their solutions? (P7: 11-16)

1 (c) What are the general 3 steps of face recognition? (P7:17)

1 (d) There are two kinds of the methods in face detection and location, which are statistics-based and knowledge-based method. What difference between them? (P7: 18-22)

1 (e) There are five methods of face feature extraction (P7: 24-41). Please give their basic ideas.

1 (e) What are the advantages and disadvantages of face recognition? (P7: 48)

2. Understand the eigenfaces algorithm (P7: 26-29) and eigenfaces recognition algorithm (P7: 30-31).

3. Eigenface is PCA-based method which is introduced in Lecture 4. At the fifth step of PCA method (P4:23-24) the k most principal components are selected based on the ratio () of the eigenvalue sum of selected components to the total sum. Please decide the value of k when the threshold of is 95%. In P7:31 there is a training set including 27 facial images to get eigenfaces. Can you give the value of k according to the training result (eigenfaces)? (7; 9)

4. P7:34 shows some examples of local features. Please try to define the geometry features based on the woman’s face image (refer to P7:34) and give the number of features. (21)