Search Results for author: Kunbo Zhang

Found 8 papers, 3 papers with code

CASIA-Iris-Africa: A Large-scale African Iris Image Database

no code implementations25 Feb 2023 Jawad Muhammad, Yunlong Wang, Junxing Hu, Kunbo Zhang, Zhenan Sun

The database contains 28, 717 images of 1023 African subjects (2046 iris classes) with age, gender, and ethnicity attributes that can be useful in demographically sensitive studies of Africans.

Iris Recognition

An End-to-End Autofocus Camera for Iris on the Move

1 code implementation29 Jun 2021 Leyuan Wang, Kunbo Zhang, Yunlong Wang, Zhenan Sun

To accommodate users at different distances, it is necessary to control focus quickly and accurately.

Iris Recognition

CASIA-Face-Africa: A Large-scale African Face Image Database

no code implementations8 May 2021 Jawad Muhammad, Yunlong Wang, Caiyong Wang, Kunbo Zhang, Zhenan Sun

The proposed database along with its face landmark annotations, evaluation protocols and preliminary results form a good benchmark to study the essential aspects of face biometrics for African subjects, especially face image preprocessing, face feature analysis and matching, facial expression recognition, sex/age estimation, ethnic classification, face image generation, etc.

Age Estimation Face Recognition +3

All-in-Focus Iris Camera With a Great Capture Volume

no code implementations19 Nov 2020 Kunbo Zhang, Zhenteng Shen, Yunlong Wang, Zhenan Sun

In this study, we develop a novel all-in-focus iris imaging system using a focus-tunable lens and a 2D steering mirror to greatly extend capture volume by spatiotemporal multiplexing method.

Iris Recognition

Recognition Oriented Iris Image Quality Assessment in the Feature Space

1 code implementation1 Sep 2020 Leyuan Wang, Kunbo Zhang, Min Ren, Yunlong Wang, Zhenan Sun

The quality metric proposed in this paper can significantly improve the performance of the recognition algorithm while reducing the number of images discarded for recognition, which is advantageous over hand-crafted factors based iris quality assessment methods.

Image Quality Assessment

Face Anti-Spoofing by Learning Polarization Cues in a Real-World Scenario

no code implementations18 Mar 2020 Yu Tian, Kunbo Zhang, Leyuan Wang, Zhenan Sun

Extensive experiments demonstrate the advantages of the PAAS technique to counter diverse face spoofing attacks (print, replay, mask) in uncontrolled indoor and outdoor conditions by learning polarized face images of 33 people.

Face Anti-Spoofing

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