Image enhancement method in automatic fingerprint identification technology

A fingerprint recognition technology and fingerprint image technology, applied in the field of finger fingerprint image enhancement, can solve the problems of high time cost and large influence of edge noise, and achieve the effect of improving the clarity of lines

Inactive Publication Date: 2012-08-08
ZHEJIANG INT STUDIES UNIV
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Problems solved by technology

However, the two-dimensional sinusoidal filter used is not modulated, and the edge noise has a great influence on the enhancement resu

Method used

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  • Image enhancement method in automatic fingerprint identification technology
  • Image enhancement method in automatic fingerprint identification technology
  • Image enhancement method in automatic fingerprint identification technology

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Embodiment Construction

[0059] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0060] The image enhancement method in automatic fingerprint recognition technology, firstly, introduces the Gaussian function and the two-dimensional sine model into the fingerprint image enhancement process, constructs a two-dimensional sine filter consistent with the fingerprint texture according to the intrinsic properties of the fingerprint image, and uses The two-dimensional Gaussian function modulates the two-dimensional sinusoidal filter to construct a Gaussian modulated two-dimensional sinusoidal filter. Then, according to the actual needs of fingerprint image enhancement processing, the Gaussian modulated two-dimensional sinusoidal filter is modified to construct a Gaussian modulated two-dimensional sinusoidal filter that meets the actual needs of fingerprint image processing, and then the frequency parameters and direction parameters o...

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Abstract

The invention relates to a fingerprint identification method and a system thereof, relates to a fingerprint image enhancement method and discloses an image enhancement method in an automatic fingerprint identification technology. The method is characterized by: firstly, constructing a two-dimensional sine filter which has a consistent with a fingerprint; then, using a two-dimensional Gaussian function to carry out modulation on the two-dimensional sine filter so as to obtain a Gaussian modulation two-dimensional sine filter; and carrying out correction on the Gaussian modulation two-dimensional sine filter, constructing the filter which accords with an actual need of fingerprint image processing; using a frequency parameter and a direction parameter of each fingerprint image area to construct an appropriate enhancement template of the Gaussian modulation two-dimensional sine filter; finally carrying out convolution operation on the corresponding Gaussian modulation two-dimensional sine filter template and the corresponding fingerprint image area, carrying out enhancement processing on the fingerprint image, and carrying out normalization processing on an enhancement result so as to obtain the final enhancement fingerprint image.

Description

technical field [0001] The invention relates to a method and system for fingerprint identification, and relates to a method for enhancing a fingerprint image of a finger. Background technique [0002] Automatic fingerprint identification technology refers to a biometric identification technology that uses the distribution pattern of ridges and valleys on the surface of fingers to confirm the identity of the identification object. As one of the basic characteristics of the human body, fingerprints have the characteristics of uniqueness, invariance, and regularity in arrangement and distribution. Human beings have been using fingerprints as an important means of identification for a long time, and it has a long history. The legitimacy and effectiveness of using fingerprints to identify objects has long been widely recognized. In ancient China, there was a tradition of pressing fingerprints instead of signatures on various documents and contracts. At present, in addition to t...

Claims

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Application Information

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IPC IPC(8): G06K9/00
Inventor 詹小四
Owner ZHEJIANG INT STUDIES UNIV
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