Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: PatchNet: A Simple Face Anti-Spoofing Framework via Fine-Grained Patch
  Recognition   Face anti-spoofing (FAS) plays a critical role in securing face recognition
systems from different presentation attacks. Previous works leverage auxiliary
pixel-level supervision and domain generalization approaches to address unseen
spoof types. However, the local characteristics of image captures, i.e.,
capturing devices and presenting materials, are ignored in existing works and
we argue that such information is required for networks to discriminate between
live and spoof images. In this work, we propose PatchNet which reformulates
face anti-spoofing as a fine-grained patch-type recognition problem. To be
specific, our framework recognizes the combination of capturing devices and
presenting materials based on the patches cropped from non-distorted face
images. This reformulation can largely improve the data variation and enforce
the network to learn discriminative feature from local capture patterns. In
addition, to further improve the generalization ability of the spoof feature,
we propose the novel Asymmetric Margin-based Classification Loss and
Self-supervised Similarity Loss to regularize the patch embedding space. Our
experimental results verify our assumption and show that the model is capable
of recognizing unseen spoof types robustly by only looking at local regions.
Moreover, the fine-grained and patch-level reformulation of FAS outperforms the
existing approaches on intra-dataset, cross-dataset, and domain generalization
benchmarks. Furthermore, our PatchNet framework can enable practical
applications like Few-Shot Reference-based FAS and facilitate future
exploration of spoof-related intrinsic cues.

5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an