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A fingerprint image enhancement method based on phase stretching transformation

A fingerprint image and phase technology, applied in the field of image processing, to achieve the effect of small calculation and obvious effect

Inactive Publication Date: 2019-03-29
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

There are many fingerprint enhancement methods at present, but there is still a lot of room for improvement in terms of calculation speed and effective texture enhancement.

Method used

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  • A fingerprint image enhancement method based on phase stretching transformation
  • A fingerprint image enhancement method based on phase stretching transformation
  • A fingerprint image enhancement method based on phase stretching transformation

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Embodiment Construction

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] like figure 1 As shown, a kind of fingerprint image enhancement method based on phase stretch transformation proposed by the present invention, the technical scheme is as follows:

[0028] 1) Input fingerprint image

[0029] 2) Obtain the target fingerprint area

[0030] like figure 2 As shown in (a), firstly, adaptive threshold processing is performed on the fingerprint image to obtain the binary image of the fingerprint image. The threshold value is the average value of the neighboring pixels, and each pixel is compared with the average value of its domain pixels. The average value is 0, otherwise it is 255; figure 2 As shown in (b)-(c), the morphological opening operation is performed. The morphological opening operation is to perform morphologica...

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Abstract

The invention aims at the shortcomings of computing speed and effective texture enhancement in fingerprint identification, provides a method of fingerprint image enhancement in fingerprint identification system. The method uses the obtained fingerprint image to intercept the target fingerprint image, and then uses the limited contrast histogram equalization method to enhance the overall contrast of the target fingerprint image, and uses the phase stretching transformation method to enhance the texture of the enhanced target fingerprint image and denoise the background, so as to obtain the enhanced fingerprint image. The invention can effectively enhance the fingerprint texture information in the fingerprint picture, especially in the low-quality fingerprint picture, thereby improving the fingerprint identification performance in the fingerprint identification system.

Description

technical field [0001] The invention belongs to the field of image processing, and more specifically relates to a fingerprint image enhancement method. Background technique [0002] With the continuous development of the information age, biometric technology has attracted more and more attention. Biometrics technology is a technology that uses biological inherent features to identify and prove identity. Biometrics can prove a person's self without relying on various man-made additional items, and studies have shown that each person's fingerprints, irises, retinas, etc. are related to others. Different, and unchanged throughout life, so biometrics have stronger reliability. At present, the biological characteristics used for identification mainly include fingerprints, voice, iris, DNA and so on. [0003] Fingerprint identification technology is one of the most widely used technologies in biometric identification technology, and is widely used in various identity verificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06K9/00
CPCG06T2207/20021G06T2207/20056G06T2207/20036G06T2207/20182G06V40/1347G06T5/90G06T5/70
Inventor 蔡震震袁文锋
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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