Method for quantitatively calculating fingerprint deformation

A quantitative calculation and fingerprint technology, applied in calculation, computer components, complex mathematical operations, etc.

Active Publication Date: 2019-08-09
INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In view of the above problems, the purpose of the present invention is to provide a method for quantitatively calculating the...

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  • Method for quantitatively calculating fingerprint deformation
  • Method for quantitatively calculating fingerprint deformation
  • Method for quantitatively calculating fingerprint deformation

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Embodiment Construction

[0073] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but only to illustrate the essence of the technical solutions of the present invention.

[0074] Such as figure 1 Shown, the present invention provides a kind of method of quantitative calculation fingerprint deformation size, and it comprises the following steps:

[0075] 1) Scale normalization preprocessing is performed on two fingerprint images collected from the same finger part, and one fingerprint image is regarded as a standard fingerprint image, and the other fingerprint image is regarded as a deformed fingerprint image;

[0076] In order to calculate the size of the deformation between two fingerprints, according to the s...

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Abstract

The invention discloses a method for quantitatively calculating fingerprint deformation, which comprises the following steps of: 1) carrying out scale normalization preprocessing on two fingerprint images collected at the same finger part, and regarding one fingerprint image as a standard fingerprint drawing and regarding the other fingerprint image as a deformed fingerprint image; 2) drawing a square grid in a fingerprint line area in the standard fingerprint image, comparing the fingerprint line area of the deformed fingerprint image to select an intersection of effective square grids in thestandard fingerprint image as a reference point, and establishing coordinates; 3) finding out positions corresponding to all reference points of the standard fingerprint image in the deformed fingerprint image as reference points of the deformed fingerprint image, drawing a square grid and establishing coordinates; 4) calculating an average distance deformation amount and an average angle deformation amount between the standard fingerprint image and the deformed fingerprint image; and 5) calculating a total relative deformation amount delta Z between the deformed fingerprint image and the standard fingerprint image.

Description

technical field [0001] The invention relates to a method for quantitatively calculating the deformation size of fingerprints, which belongs to the field of forensic science and technology. Background technique [0002] In the field of forensic science and technology, the fingerprint feature of a person is an important feature for identifying the individual identity of a person. Human fingers usually behave as elastic deformable bodies. When the finger touches the surface of the object, under the action of force, the fingerprint traces left on the surface of the object by the same finger part may not be exactly the same every time, but will produce a certain deformation, the degree of deformation It is related to various factors such as the magnitude and direction of the force, and the nature of the object surface. The force and its direction are usually manifested as stretching, extrusion, twisting and rotation, etc. The force and its direction will not only change the rela...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06T3/00G06F17/18
CPCG06T3/0093G06F17/18G06V40/1347G06V40/13
Inventor 韩柯李孝君陈子龙马荣梁
Owner INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY
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