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LEARNING COMPACT BINARY FACE DESCRIPTOR FOR
FACE RECOGNITION
ABSTRACT
Binary feature descriptors such as local binary patterns (LBP) and its variations have
been widely used in many face recognition systems due to their excellent robustness and strong
discriminative power. However, most existing binary face descriptors are hand-crafted, which
require strong prior knowledge to engineer them by hand. In this paper, we propose a compact
binary face descriptor (CBFD) feature learning method for face representation and recognition.
Given each face image, we first extract pixel difference vectors (PDVs) in local patches by
computing the difference between each pixel and its neighboring pixels. Then, we learn a feature
mapping to project these pixel difference vectors (PDVs) into low-dimensional binary vectors in
an unsupervised manner, where 1) the variance of all binary codes in the training set is
maximized, 2) the loss between the original real-valued codes and the learned binary codes is
minimized, and 3) binary codes evenly distribute at each learned bin, so that the redundancy
information in PDVs is removed and compact binary codes are obtained. Lastly, we cluster and
pool these binary codes into a histogram feature as the final representation for each face image.
Moreover, we propose a coupled CBFD (C-CBFD) method by reducing the modality gap of
heterogeneous faces at the feature level to make our method applicable to heterogeneous face
recognition. Ext

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LEARNING COMPACT BINARY FACE DESCRIPTOR FOR FACE RECOGNITION

  • 1. LEARNING COMPACT BINARY FACE DESCRIPTOR FOR FACE RECOGNITION ABSTRACT Binary feature descriptors such as local binary patterns (LBP) and its variations have been widely used in many face recognition systems due to their excellent robustness and strong discriminative power. However, most existing binary face descriptors are hand-crafted, which require strong prior knowledge to engineer them by hand. In this paper, we propose a compact binary face descriptor (CBFD) feature learning method for face representation and recognition. Given each face image, we first extract pixel difference vectors (PDVs) in local patches by computing the difference between each pixel and its neighboring pixels. Then, we learn a feature mapping to project these pixel difference vectors (PDVs) into low-dimensional binary vectors in an unsupervised manner, where 1) the variance of all binary codes in the training set is maximized, 2) the loss between the original real-valued codes and the learned binary codes is minimized, and 3) binary codes evenly distribute at each learned bin, so that the redundancy information in PDVs is removed and compact binary codes are obtained. Lastly, we cluster and pool these binary codes into a histogram feature as the final representation for each face image. Moreover, we propose a coupled CBFD (C-CBFD) method by reducing the modality gap of heterogeneous faces at the feature level to make our method applicable to heterogeneous face recognition. Ext