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Preprocessing method of fingerprint image and device thereof

A fingerprint image and preprocessing technology, applied in the field of biometrics, can solve the problems of difficulty in fingerprint feature extraction, no extraction and removal, etc.

Active Publication Date: 2018-06-05
DATANG MICROELECTRONICS TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The present invention can increase the speed of image preprocessing, intelligently supplement, repair, improve and update fingerprint data, and improve the recognition rate. Influence of the quality image; and the image preprocessing step only realizes the binarization operation, and does not remove the false fingerprint graph line brought by this operation step for the later feature extraction, which makes it difficult for the later fingerprint feature extraction

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  • Preprocessing method of fingerprint image and device thereof
  • Preprocessing method of fingerprint image and device thereof
  • Preprocessing method of fingerprint image and device thereof

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Embodiment Construction

[0048] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0049] Such as figure 1 Shown, according to a kind of fingerprint image preprocessing method of the present invention, comprises the following steps:

[0050] Step 101: performing enhanced processing on the original fingerprint image to obtain an enhanced fingerprint image;

[0051] It is worth noting that how to enhance the original fingerprint image can be realized by image enhancement algorithms in the prior art, such as image enhancement algorithms based on Gabor filtering or various existing optimized image enhancement algorithms based on Gabor filtering, The present i...

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Abstract

The invention discloses a preprocessing method of a fingerprint image, particularly a low-quality fingerprint image, and a device thereof. The method comprises the steps of performing enhancement processing on an original fingerprint image, and obtaining an enhanced fingerprint image; if an absolute value of a difference between corresponding frequencies of a certain pixel in the original fingerprint image and the enhanced fingerprint image is lower than or equal to a preset difference threshold, and the absolute value of the difference between the pixel values of the pixel in the original fingerprint image and the enhanced fingerprint image is lower than or equal to alpha times of the adjacent domain mean value of the pixel in the original fingerprint image, updating the pixel value of the pixel in the enhanced fingerprint image by means of the pixel value of the pixel in the original fingerprint image, wherein alpha is a preset scale factor; and performing binary processing on the enhanced fingerprint image, thereby obtaining a binary fingerprint image. According to the method and the device, through comparing the frequency difference and the pixel value difference in the enhanced fingerprint image and the original fingerprint image, a false fingerprint line which is introduced in a processing process is modified as possible.

Description

technical field [0001] The present invention relates to but not limited to the technical field of biometric identification, in particular to a fingerprint image preprocessing method and device. Background technique [0002] Biometrics refers to identification based on the physiological or behavioral characteristics of a person, mainly including face recognition, fingerprint recognition, iris recognition, voice recognition, retina recognition, etc., which are safe and reliable. Among them, automatic fingerprint recognition The system is currently the most researched and most promising biometric system. [0003] In the patent with the publication number "CN101604384B" and the invention name "Personalized Fingerprint Identification Method", a fingerprint identification method is proposed, including fingerprint collection, image preprocessing, and feature extraction; in the image preprocessing step, binary The processing method adopts a skeleton type binarization processing met...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/40
CPCG06V40/1347G06V10/30
Inventor 郭晓丽周清熊燕萍
Owner DATANG MICROELECTRONICS TECH CO LTD
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