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Biometrics and Security Tutorial 3

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1 (a) What is the scatter matrix (P4: 21)? Understand what about eigenvector and eigenvalue as well as their functions? (P4: 22)

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1.(b) Understand the PCA application to facial recognition: Eigenface. (P4: 26-30)

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1. (c) Compare two StatPR techniques, PCA and LDA (P4: 13) and point out their main difference (P4: 42-45) 1. (d) Linear discrimination analysis (LDA) is introduced in P5:37-40. Please understand the two steps in P5:37 and compare within-class scatter matrix with between-class scatter matrix.

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2.There are three PR approaches: StatPR, SyatPR and NN. What difference between them (P4:4-10)? Based on your knowledge, can you give a simple application for each approach? 3.Please check the example of PR approaches in P4:10. Try to analysis the character “H” by statistical PR approach and structural PR approach. (StatPR approach - the feature set: (intersections, -, |, holes) and x=[2,1,4,0]; SyntPR approach - primitives and relations: ++++)

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4.From P4:19-25, PCA method given by using image data is defined, which projects an image space with 644 dimension into 6 dimension eigenvector space. Please understand each step. 5.According to the figure in P4: 24, how to find its minimum λ if we hope to get rλ > 60? (λ = 3)

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