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Automatic distorted fingerprint detecting method

An automatic detection and fingerprint technology, applied in the direction of instruments, character and pattern recognition, computer parts, etc., to achieve the effect of good compatibility

Inactive Publication Date: 2013-04-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The object of the present invention is to solve the problem of distortion detection from a single fingerprint image

Method used

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Embodiment Construction

[0022] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise" and other directions or positions indicated The relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the pr...

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Abstract

The invention provides an automatic distorted fingerprint detecting method. The automatic distorted fingerprint detecting method includes subjecting a fingerprint image to ridge line circle analysis, acquiring circle standard difference of the fingerprint image, analyzing direction field information of the fingerprint image, acquiring normal curvature average value and tangent curvature average value of the fingerprint image; integrating the circle standard difference, the normal curvature average value and the tangent curvature average value to obtain torsion resistance of the fingerprint image. Distorted fingerprint is hard to identify by existing automatic fingerprint identification technology, while the automatic distorted fingerprint detecting method only needs one distorted fingerprint image to judge distortion degree and has the advantages of good compatibility, low data demands and convenience in algorithm.

Description

Technical field [0001] The invention relates to the field of fingerprint identification, in particular to an automatic detection method of twisted fingerprints. Background technique [0002] Fingerprint recognition technology has achieved rapid development in the past few years, but there are still many challenging research problems. Among them, the identification of twisted fingerprints is a very difficult problem. The twisting occurs because of the elasticity of the finger skin. When there are differences in the direction and strength of the two pressings of the same finger, there will be distortion between the two fingerprint images. When the distortion is serious, the existing fingerprint matching algorithms can easily judge them as different fingerprints. [0003] The inability to match the distorted fingerprint has different negative effects on different fingerprint identification systems. Fingerprint identification systems can be divided into two categories: one is ident...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
Inventor 冯建江周杰司轩斌
Owner TSINGHUA UNIV
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