1. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Flowchart for the proposed unified unimodal biometric system. Figure Legend: From: Unimodal biometric system based on local topology structure preserving projections Opt. Eng. 2009;48(11):117207-117207-8. doi:10.1117/1.3264147

2. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Illustration of the proposed LTSPP algorithm: (a) four classes in the high-dimensional space; and (b) embedding results in the low- dimensional space by the LTSPP algorithm. Figure Legend: From: Unimodal biometric system based on local topology structure preserving projections Opt. Eng. 2009;48(11):117207-117207-8. doi:10.1117/1.3264147

3. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Sample images of one subject from the Yale database. Figure Legend: From: Unimodal biometric system based on local topology structure preserving projections Opt. Eng. 2009;48(11):117207-117207-8. doi:10.1117/1.3264147

4. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Average recognition rates versus subspace dimensions on the Yale database. Figure Legend: From: Unimodal biometric system based on local topology structure preserving projections Opt. Eng. 2009;48(11):117207-117207-8. doi:10.1117/1.3264147

5. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. The 10 sample images of one subject from the HumanID gait database. Figure Legend: From: Unimodal biometric system based on local topology structure preserving projections Opt. Eng. 2009;48(11):117207-117207-8. doi:10.1117/1.3264147

6. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Average recognition rates versus subspace dimensions on the HumanID gait database. Figure Legend: From: Unimodal biometric system based on local topology structure preserving projections Opt. Eng. 2009;48(11):117207-117207-8. doi:10.1117/1.3264147