Fingerprint matching based on local relative orientation field

Early detection and intervention strategies for schizophrenia are receiving increasingly more attention. Dermatoglyphic patterns, such as the degree of asymmetry of the fingerprints, have been hypothesized to be indirect measures for early abnormal developmental processes that can lead to later psychiatric disorders such as schizophrenia. However, previous results have been inconsistent in trying to establish the association between dermatoglyphics and schizophrenia. The goal of this work is to try to resolve this problem by borrowing well-developed techniques from the field of fingerprint matching. Two dermatoglyphic asymmetry measures are proposed that draw on the orientation field of homologous fingers. To test the capability of these measures, fingerprint images were acquired digitally from 40 schizophrenic patients and 51 normal individuals. Based on these images, no statistically significant association between conventional dermatoglyphic asymmetry measures and schizophrenia was found. In contrast, the sample means of the proposed measures consistently identified the patient group as having a higher degree of asymmetry than the control group. These results suggest that the proposed measures are promising for detecting the dermatoglyphic patterns that can differentiate the patient and control groups.

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Fingerprint Singular Point Detection Using Orientation Field Reliability

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.403-408.4499 ◽

2011 ◽

Vol 403-408 ◽

pp. 4499-4506 ◽

Cited By ~ 2

Author(s):

Ravinder Kumar ◽

Pravin Chandra ◽

M. Hanmandlu

Keyword(s):

Singular Point ◽

Detection Rate ◽

Singular Points ◽

Identification System ◽

Fingerprint Matching ◽

Orientation Field ◽

Point Detection ◽

Field Reliability ◽

Fingerprint Alignment ◽

Novel Algorithm

Singular point detection is the most important step in Automatic Fingerprint Identification System (AFIS) and is used in fingerprint alignment, fingerprint matching, and particularly in classification. The computation of orientation field of a fingerprint can be verified by computing orientation field reliability. The most unreliable portion in orientation field can be the possible location of singular points. In this paper we have proposed a novel algorithm for detecting singular points using reliability of the fingerprint orientation field. Experimental results show that the proposed algorithm accurately detects singular points (core and delta) with the detection rate of 92.6 %.

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Correlation-Based Fingerprint Matching with Orientation Field Alignment

Advances in Biometrics - Lecture Notes in Computer Science ◽

10.1007/978-3-540-74549-5_75 ◽

2007 ◽

pp. 713-721 ◽

Cited By ~ 8

Author(s):

Almudena Lindoso ◽

Luis Entrena ◽

Judith Liu-Jimenez ◽

Enrique San Millan

Keyword(s):

Fingerprint Matching ◽

Orientation Field

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Fingerprint matching combining the global orientation field with minutia

Pattern Recognition Letters ◽

10.1016/j.patrec.2005.04.016 ◽

2005 ◽

Vol 26 (15) ◽

pp. 2424-2430 ◽

Cited By ~ 36

Author(s):

Jin Qi ◽

Suzhen Yang ◽

Yangsheng Wang

Keyword(s):

Fingerprint Matching ◽

Orientation Field ◽

Global Orientation

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The orientation of sickle hemoglobin fibers within fascicles

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100104066 ◽

1988 ◽

Vol 46 ◽

pp. 400-401

Author(s):

Christopher A. Miller ◽

Bridget Carragher ◽

William A. McDade ◽

Robert Josephs

Keyword(s):

Sickle Cell ◽

Sickle Cell Anemia ◽

Relative Orientation ◽

Unit Cell ◽

Red Cell ◽

High Ph ◽

Sickle Hemoglobin ◽

Polar Crystal ◽

Helical Configuration

Highly ordered bundles of deoxyhemoglobin S (HbS) fibers, termed fascicles, are intermediates in the high pH crystallization pathway of HbS. These fibers consist of 7 Wishner-Love double strands in a helical configuration. Since each double strand has a polarity, the odd number of double strands in the fiber imparts a net polarity to the structure. HbS crystals have a unit cell containing two double strands, one of each polarity, resulting in a net polarity of zero. Therefore a rearrangement of the double strands must occur to form a non-polar crystal from the polar fibers. To determine the role of fascicles as an intermediate in the crystallization pathway it is important to understand the relative orientation of fibers within fascicles. Furthermore, an understanding of fascicle structure may have implications for the design of potential sickling inhibitors, since it is bundles of fibers which cause the red cell distortion responsible for the vaso-occlusive complications characteristic of sickle cell anemia.

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The coprecipitation of Cr3P and Cr in Cu

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100105886 ◽

1988 ◽

Vol 46 ◽

pp. 764-765

Author(s):

M.J. Witcomb ◽

U. Dahmen ◽

K.H. Westmacott

Keyword(s):

Orientation Relationship ◽

Interface Structure ◽

Model System ◽

Relative Orientation ◽

Age Hardening ◽

Precipitation Behavior ◽

Solution Treated ◽

Small Needle ◽

Diffraction Patterns ◽

Interface Structures

Cu-Cr age-hardening alloys are of interest as a model system for the investigation of fcc/bcc interface structures. Several past studies have investigated the morphology and interface structure of Cr precipitates in a Cu matrix (1-3) and good success has been achieved in understanding the crystallography and strain contrast of small needle-shaped precipitates. The present study investigates the effect of small amounts of phosphorous on the precipitation behavior of Cu-Cr alloys.The same Cu-0.3% Cr alloy as was used in earlier work was rolled to a thickness of 150 μm, solution treated in vacuum at 1050°C for 1h followed by quenching and annealing for various times at 820 and 863°C.Two laths and their corresponding diffraction patterns in an alloy aged 2h at 820°C are shown in correct relative orientation in Fig. 1. To within the limit of accuracy of the diffraction patterns the orientation relationship was that of Kurdjumov-Sachs (KS), i.e. parallel close-packed planes and directions.

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