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Method and device for acquiring direction of fingerprint

A fingerprint and direction map technology, used in character and pattern recognition, instruments, computer parts, etc.

Inactive Publication Date: 2012-08-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]Therefore, a technical problem that needs to be urgently solved by those skilled in the art is: how to innovatively propose a method and device for obtaining the direction of fingerprints on the spot to solve This current problem of poor fingerprint extraction results on the spot can effectively improve the quality of on-site fingerprint extraction, provide more help for case detection, and further promote the rapid detection of cases

Method used

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  • Method and device for acquiring direction of fingerprint
  • Method and device for acquiring direction of fingerprint
  • Method and device for acquiring direction of fingerprint

Examples

Experimental program
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Embodiment 1

[0082] refer to figure 1 , which shows a flow chart of a method for obtaining the direction of an on-site fingerprint according to the present invention, the method specifically includes:

[0083] S101, extracting the part containing the fingerprint in the image, and obtaining the effective area of ​​the fingerprint image;

[0084] The part containing the fingerprint in the extracted image refers to the part containing the ridge line in a fingerprint image. This part of the image is usually called the effective area of ​​the fingerprint image. Specifically, the fingerprint image is divided into 16 *16 pixel square. Count the gray mean and variance of each grid. If its gray value is in the range of [30, 220], and the variance is greater than 5, then the current square is determined as a valid square. Perform 3*3 frequency domain filtering on the result obtained above, that is, for each 16*16 pixel square, if its 3*3 neighborhood (that is, eight 16*16 pixel connected to it ...

Embodiment 2

[0199] refer to image 3 , which shows a structural diagram of a device for obtaining the direction of on-site fingerprints according to the present invention, the device specifically includes:

[0200] Extraction module 301, is used for extracting the part that contains fingerprint in the image, obtains the effective area of ​​fingerprint image;

[0201] Obtaining module 302, configured to obtain the direction diagram and confidence degree of the obtained valid area;

[0202] A judging module 303, configured to judge whether the obtained confidence is higher than a preset confidence threshold:

[0203] The first marking module 304 is configured to mark the area as a high confidence area when the judging module 303 judges yes;

[0204] The second marking module 305 is used to mark the area as a low confidence area when the judging module 303 judges as no;

[0205] The first processing module 306 is used to collect control points in areas with high confidence in the directio...

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Abstract

The invention provides a method and a device for acquiring the direction of a fingerprint on site. Control points are added in an interactive mode, the automatic processing capacity of a computer and the intelligence and flexibility of human are fused, a direction diagram is acquired by a model method according to the obtained control points, the acquired directional diagram is ensured to have certain anti-noise capacity, a necessary foundation is laid for subsequent fingerprint comparison, the problem of extracting the directional diagram for a fingerprint with poor quality extracted on siteis solved, and potent assistance is provided for detecting cases.

Description

technical field [0001] The invention relates to the technical field of fingerprint identification, in particular to a method and a device for obtaining the direction of an on-site fingerprint. Background technique [0002] In criminal detection, fingerprint recognition is a very common technology. In practical applications, a large category of requirements for criminal fingerprint identification is the comparison of on-site fingerprints, and possible criminal suspects can be found by identifying fingerprints extracted from crime scenes. Scene fingerprints refer to fingerprints left at the crime scene (fingerprint traces left after touching objects). [0003] In practical application, the fingerprint recognition method is mainly based on the comparison of minutiae points, that is, extract minutiae points as features to represent the fingerprint image, and identify by comparing these minutiae points. The comparison method based on minutiae is divided into two main processes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/32G06K9/00
CPCG06K9/00067G06V40/1347
Inventor 周杰陈芳林夏露
Owner TSINGHUA UNIV
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