Fingerprint direction field obtaining method based on structure tensor

A technology of structure tensor and acquisition method, applied in the field of image processing, can solve problems such as large amount of calculation and unsatisfactory speed performance

Active Publication Date: 2013-12-25
厚普清洁能源(集团)股份有限公司
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Problems solved by technology

In contrast, the accuracy of the direction field obtained by the formula method is higher, but the disadvantag

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  • Fingerprint direction field obtaining method based on structure tensor
  • Fingerprint direction field obtaining method based on structure tensor
  • Fingerprint direction field obtaining method based on structure tensor

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Embodiment Construction

[0036] In order to describe content of the present invention conveniently, at first some prior art terms are described:

[0037] Fingerprints: bumpy lines on the skin on the front of the ends of fingers.

[0038] Grayscale image: An image that contains only brightness information without any other color information.

[0039] First-order grayscale difference: In a grayscale image, the grayscale difference of adjacent pixels in a certain direction is used as the first-order difference value; the first-order difference can highlight the vertical edge information of the image, which is convenient for edge extraction.

[0040] Gradient image: a matrix composed of the gradient at each pixel in the image; the gradient reflects the degree of change of the pixels in the image, and is usually used to detect the edge of the image.

[0041] Structure tensor: The structure tensor is a symmetrical two-dimensional positive definite matrix, which comes from the analytical solution of the non...

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Abstract

The invention provides a fingerprint direction field obtaining method based on a structure tensor. According to the method, firstly, histogram equalization is carried out on images, and compared with an original smoothing filtering process, the method better highlights the contrast ratio of the images. By means of the structure tensor, a point direction field of a fingerprint image can be accurately calculated. When the structure tensor is solved, mean filtering replaces original Gaussian filtering, and a mean filtering operation is achieved in a serialization calculation method. On the condition that effects are not influenced, the operating speed is substantially improved, and the method can be used in situations where the accuracy and time are strictly required, such as an embedded system.

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 its physical characteristics or individual behavior characteristics for identity verification, and compares these characteristics or characteristics with the template data in the database to complete identity 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 technology,...

Claims

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Application Information

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IPC IPC(8): G06K9/46G06K9/40G06K9/00
Inventor 解梅陈功孙其建
Owner 厚普清洁能源(集团)股份有限公司
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