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Method for reinforcing fingerprint image based on one-dimensional filtering

A fingerprint image and fingerprint technology, applied in the field of image processing, can solve the problem of slow calculation speed of algorithm 4

Inactive Publication Date: 2008-12-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

At the same time, this algorithm uses the algorithm of Algorithm 4 to improve the accuracy and enhancement effect of the direction field through repeated enhancement, but the calculation speed of Algorithm 4 is slow, and it only enhances in the direction of the ridge

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  • Method for reinforcing fingerprint image based on one-dimensional filtering
  • Method for reinforcing fingerprint image based on one-dimensional filtering
  • Method for reinforcing fingerprint image based on one-dimensional filtering

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Embodiment Construction

[0070] The method of the present invention is implemented in VC6.0 software, and the fingerprint image is obtained by a CMOS pressure-sensitive sensor. The average time to complete a fingerprint image enhancement in PC Intel Celeron 1.0GHZ with VC6.0 is 0.6s.

[0071] A specific implementation example of the present invention is given below.

[0072] It should be noted that the parameters in the following examples do not affect the generality of this patent.

[0073] 1. Collect the fingerprint image, and use the method of step 1-step 3 to cut and stretch the image.

[0074] 2. Smooth the fingerprint image with a Gaussian filter, where the size of the Gaussian template is 3×3 and the standard deviation is 0.5.

[0075] 3. Calculate the horizontal and vertical first-order difference images of the fingerprint image.

[0076] 4. Calculate the structure tensor for each pixel of the fingerprint image, where the size of the Gaussian template is 5×5, and the standard deviation is 5...

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Abstract

The invention provides a fingerprint image enhancing method based on one-dimensional filter waves, which pertains to the technical field of image processing. Firstly, gray level cutting and gray level stretching are carried out to a gray level image, which causes the contrast between foreground and the background of a fingerprint image to be enhanced; then the property of structure tensor is adopted to carry out the precise evaluation to the direction field of a fingerprint; then a one-dimensional Gaussian filter is adopted to smooth the fingerprint image at the ridge direction; a one-dimensional Gabor filter is adopted to enhance the fingerprint image at the gradient direction (which is vertical to the ridge direction). The evaluation and enhancement of the direction field is carried out again to the fingerprint image after being enhanced, and therefore the fingerprint image can achieve relatively good effect after repeating a plurality of times. By adopting the fast fingerprint image enhancement algorithm based on one-dimensional filter waves provided by the invention, better enhancement effect can be achieved in less time, and the algorithm is especially effective in the enhancement of low-quality fingerprint images.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to the fingerprint image processing technology in the fingerprint identification technology. Background technique [0002] Biometric identification technology is a solution that uses automatic technology to measure the characteristics of the body or the behavior characteristics of individuals for identity verification, and compares these characteristics or characteristics with the template data in the database to complete the authentication. As the most mature and convenient member of biometric technology, fingerprint recognition technology has been successfully applied in various fields of society. Such as: access control, attendance system, e-commerce, ATM automatic teller machine and criminal identification system, etc. As a safe and reliable identification method, the fingerprint automatic identification system established by relying on fingerprint identification techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06T5/00
Inventor 解梅俞成浦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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