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- 저자 : Meini Li (검색결과 2 건)
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Palm Vein Recognition Using Directional Features Derived from Local Binary Patterns
Wenjing Lu,Meini Li,Lei Zhang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.5
Vein-based biometrics is a newly developed technology for personal recognition, and it is widely used in practice and intensively studied. This paper proposes a method for palm vein recognition based on the directional information derived from local binary patters. In the proposed method, palm vein images are firstly enhanced using a multi-scale Gaussian matched filter to emphasize vein patterns before feature extraction. After that, local binary patterns are extracted from the enhanced palm vein images. Considering that the direction is the most discriminative feature of veins, the directional information is then computed from the local binary patterns. The computed palm vein features are represented as binary series, therefore, similarities can be computed efficiently by binary operation. Experiments carried out over the near infer-red band of the PolyU multispectral database shows the superiority of the proposed method on verification accuracy to some state-of-the-art literatures.
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Xiaosheng Zhou,Yaran Zhang,Yanmo Li,Meini Yuan,Guodong Li,ZhenYa Chen,Huang Zhang 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1
The flow stress and microstructure evolution of 9Cr oxide dispersion strengthened (ODS) steels were investigated by isothermalcompression at 1000–1150 oC with strain rates from 0.001 to 1 s−1. Microstructure characteristics of ODS steelsunder various condition were studied using the EBSD and TEM techniques. At each deformation temperature, PortevinLe--Chatelier (PLC) effect characteristics of repeated serrated stress was observed, as the strain rates were 0.01, 0.1 and 1 s−1. The serrations fluctuated about the mean flow curve in quick succession, and the critical strain for the PLC effect was relatedto both the deformation temperature and strain rates. The stress drops at strain rates of 0.01 and 0.1 s−1 were smaller thanthose at 1 s−1. The strain rate affected the dynamic recovery and recrystallization of austenite grains, as well as the texturecomponents of martensite transformed from austenite. Cap-shaped oxide particles in as-fabricated and hot deformed steelswere characterized in detail. The cap parts of cap-shaped oxide particles were depleted of alloying elements, and the capswere crystal or amorphous. Large-sized oxide particles were easier to be deformed than small-sized ones. Despite of theoxide deformation, the PLC effect was still suggested to be related to the solute-dislocation interaction.
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