3,643 research outputs found
Torsion and divisibility for reciprocity sheaves and 0-cycles with modulus
The notion of modulus is a striking feature of Rosenlicht-Serre's theory of
generalized Jacobian varieties of curves. It was carried over to algebraic
cycles on general varieties by Bloch-Esnault, Park, R\"ulling, Krishna-Levine.
Recently, Kerz-Saito introduced a notion of Chow group of -cycles with
modulus in connection with geometric class field theory with wild ramification
for varieties over finite fields. We study the non-homotopy invariant part of
the Chow group of -cycles with modulus and show their torsion and
divisibility properties. Modulus is being brought to sheaf theory by
Kahn-Saito-Yamazaki in their attempt to construct a generalization of
Voevodsky-Suslin-Friedlander's theory of homotopy invariant presheaves with
transfers. We prove parallel results about torsion and divisibility properties
for them.Comment: 15 pages, exposition improve
Robust Minutiae Extractor: Integrating Deep Networks and Fingerprint Domain Knowledge
We propose a fully automatic minutiae extractor, called MinutiaeNet, based on
deep neural networks with compact feature representation for fast comparison of
minutiae sets. Specifically, first a network, called CoarseNet, estimates the
minutiae score map and minutiae orientation based on convolutional neural
network and fingerprint domain knowledge (enhanced image, orientation field,
and segmentation map). Subsequently, another network, called FineNet, refines
the candidate minutiae locations based on score map. We demonstrate the
effectiveness of using the fingerprint domain knowledge together with the deep
networks. Experimental results on both latent (NIST SD27) and plain (FVC 2004)
public domain fingerprint datasets provide comprehensive empirical support for
the merits of our method. Further, our method finds minutiae sets that are
better in terms of precision and recall in comparison with state-of-the-art on
these two datasets. Given the lack of annotated fingerprint datasets with
minutiae ground truth, the proposed approach to robust minutiae detection will
be useful to train network-based fingerprint matching algorithms as well as for
evaluating fingerprint individuality at scale. MinutiaeNet is implemented in
Tensorflow: https://github.com/luannd/MinutiaeNetComment: Accepted to International Conference on Biometrics (ICB 2018
- …