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Auflistung nach Autor:in "Chen, Liming"

1 - 3 von 3
  • Konferenzbeitrag
    3D face recognition in the presence of 3D model degradations
    (BIOSIG 2011 – Proceedings of the Biometrics Special Interest Group, 2011) Lemaire, Pierre; Huang, Di; Colineau, Joseph; Ardabilian, Mohsen; Chen, Liming
    The problem of 3D face recognition has received a growing interest in the past decades. While proposed approaches have proven their efficiency over renowned databases as FRGC, little work has been conducted on the robustness of such algorithm to the quality of 3D models. In this work, we present a study of the robustness of our 3D face recognition algorithm, namely MS-ELBP+SIFT, to face model degradations. Those degradations include Gaussian noise, decimation, and holes. Degradations are generated on a subset of the FRGC database, hence enabling us to compare the robustness of our approach to them. Results are provided through a comparative study with the baseline ICP method.
  • Konferenzbeitrag
    Increasing the distinctiveness of hand vein images by oriented gradient maps
    (BIOSIG 2011 – Proceedings of the Biometrics Special Interest Group, 2011) Chen, Liming; Huang, Di; Chiheb, Hmida; Amar, Chokri Ben
    Hand vein pattern as a biometric trait for people identification has attracted an increasing interest in the recent years thanks to its properties of uniqueness, permanence, non-invasiveness and strong immunity to forgery. In this paper, we propose to make use of Oriented Gradient Maps (OGMs), that we previously proposed for face recognition using the term of Perceived Facial Images (PFIs), to represent Near-Infrared (NIR) hand dorsa vein images and to highlight the distinctiveness of hand vein patterns. Using a holistic approach through both the popular PCA and LDA, we benchmarked the proposed hand vein representations on the NCUT dataset of 2040 hand vein images and demonstrated the effectiveness of the proposed hand vein representations.
  • Konferenzbeitrag
    Nose tip localization on 2.5D facial models using differential geometry based point signatures and SVM classifier
    (BIOSIG 2012, 2012) Szeptycki, Przemyslaw; Ardabilian, Mohsen; Chen, Liming
    Nose tip localization is often the basic step for 2.5D face registration and further 3D face processing and as such appears as a side problem of most research works on 2.5D or 3D face recognition. In this paper, we propose to carry out a comprehensive study of four popular rotation invariant differential geometric properties, namely Mean and Gaussian curvature, Shape Index and Curvedness, for the purpose of nose tip localization. For each 2.5D facial model, the set of nose tip candidates is first automatically selected from a shape classification thanks to a priori knowledge of a nose region. A SVM classifier trained on a subset of the data set using the previous four curvature descriptors alone or in combination is then invoked to select the true nose tip from the candidate set. We report extensive experimental results crossvalidated in terms of True Acceptance Rate (TAR) and False Acceptance Rate (FAR) in comparison with manually labeled nose tip as the ground truth. A 99.9% Nose Tip TAR with 6.71% FAR is achieved on the FRGC v2.0 dataset when Mean curvature and Shape Index along with Curvedness are used as the input to the SVM.