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Fingerprint Image Registration Method Based on Global Information

A fingerprint image and global information technology, which is applied in the direction of acquiring/arranging fingerprints/palmprints, matching and classification, instruments, etc., can solve problems such as wrong matching judgment, difficulty, and singularities in fingerprint images

Inactive Publication Date: 2018-05-04
XIDIAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has two deficiencies: on the one hand, it is difficult to extract accurate and reliable minutiae points due to fingerprint image noise and scar interference; on the other hand, it uses the similarity of the local structure information of minutiae points to find registration references. The minutiae point pairs, because they are local information, there are completely mismatched reference minutiae point pairs, and their local structure information has a high similarity, so this pair of minutiae points will be used for registration by mistake, resulting in the final wrong matching judgment
The existing fingerprint image singular point registration method, although the registration speed is fast and reliable, but the collected fingerprint images do not necessarily have singular points, so the registration operation cannot be performed

Method used

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  • Fingerprint Image Registration Method Based on Global Information
  • Fingerprint Image Registration Method Based on Global Information
  • Fingerprint Image Registration Method Based on Global Information

Examples

Experimental program
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Embodiment Construction

[0045] Attached below figure 1 Embodiments and effects of the present invention are further described.

[0046] Step 1. Obtain the entry fingerprint image Q(x,y) and the template fingerprint image T(x,y).

[0047] Extracting two fingerprint images from the same finger from the fingerprint database J 1 (x,y) and J 2 (x, y), put one of the fingerprint images J 1 (x, y) is used as the input fingerprint image Q(x, y), and another fingerprint image J 2 (x, y) as the template fingerprint image T(x, y), where (x, y) represents the pixel coordinates of the image.

[0048] Step 2. Obtain the direction field O of the fingerprint image Q(x,y) respectively Q (x, y) and the direction field O of the template fingerprint image T(x, y) T (x,y).

[0049] The method for extracting the direction field of the existing fingerprint image commonly has the average gradient method, the least mean square estimation method and the PCA analysis method. This example uses the PCA analysis method to ...

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Abstract

The invention discloses a fingerprint image registration method based on global information. It mainly solves the problems of inaccurate registration and high time complexity in the existing fingerprint matching technology. The implementation steps are: 1. Input the input fingerprint image and the template fingerprint image, and calculate the direction field and frequency field of these two images; 2. Set the initial transformation registration parameters, and determine whether the fingerprint image registration can be performed. , then select six groups of new transformation registration parameters in the neighborhood of initial transformation registration parameters for fingerprint image registration; 3. Determine whether there is an optimal group of new transformation registration parameters among the six groups of new transformation registration parameters, if If it does not exist, use the initial transformation registration parameters as the final fingerprint image registration parameters, and end the registration; otherwise, use the best set of new transformation registration parameters as the initial transformation registration parameters, and return to step 2 until the registration ends. The invention can accurately register fingerprint images and can be used in an automatic fingerprint identification system.

Description

technical field [0001] The invention belongs to the technical field of digital image processing, relates to fingerprint image registration, and can be used in an automatic fingerprint identification system. Background technique [0002] In the automatic fingerprint identification system, fingerprint image registration is a very critical step in the fingerprint matching stage. If the registration is inaccurate, it will be propagated to the matching results, resulting in inaccurate matching scores and further reducing the recognition rate. In most fingerprint identification systems, the extracted fingerprint minutiae are used for registration and matching. This method has two deficiencies: on the one hand, it is difficult to extract accurate and reliable minutiae points due to fingerprint image noise and scar interference; on the other hand, it uses the similarity of the local structure information of minutiae points to find registration references. Since the minutiae point p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06V40/1365
Inventor 庞辽军张晓康陈炯李丹
Owner XIDIAN UNIV
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