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Fingerprint image processing method and processing device

A fingerprint image and processing method technology, applied in the field of image processing, can solve problems such as large resource consumption, and achieve the effects of reducing processing process, saving space, and reducing resource consumption

Active Publication Date: 2015-07-22
BEIJING EYECOOL TECH CO LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a fingerprint image processing method and processing device to solve the problem of large resource consumption in fingerprint image processing

Method used

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  • Fingerprint image processing method and processing device
  • Fingerprint image processing method and processing device

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Embodiment Construction

[0035] 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 with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0036] figure 1 is a flow chart of a fingerprint image processing method according to an embodiment of the present invention, such as figure 1 As shown, the method includes the following steps S102 to S120.

[0037] Step S102: Determine the direction of the pixel point (x, y) in the fingerprint image to be processed, wherein the pixel point (x, y) is any pixel point in the fingerprint image to be processed.

[0038] Specifically, the determination of the pixel point (x, y) direction is realized by the mask method:

[0039] (1) Create a mask window: such as figure 2 As shown, the radius of the mask window is set to nWndRad=4, the total number of points taken by each direction line is 2*nWnd...

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Abstract

The invention provides a fingerprint image processing method and a processing device. The fingerprint image processing method comprises the following steps of determining the direction of a pixel and enhancing the grayscale of the pixel through a Gabor filter; calculating average grayscale of the pixels in a filter window of the Gabor filter, and adopting a product of the average grayscale and coefficient sum of the filter as a binaryzation threshold value corresponding to the pixel so as to conduct the binaryzation; and judging whether a difference of the enhanced grayscale after deducting the binaryzation threshold value is more than or equal to zero or not, wherein when the difference is more than or equal to zero, the binaryzation result of the pixel is 1, and when the difference is smaller than zero, the binaryzation result of the pixel is zero. Through the fingerprint image processing method and the processing device, the binaryzation processing can be directly completed in the filter enhancing process of the Gabor filter, the temporary image storage between the enhancing step and the binaryzation processing step can be omitted, the processing flow can be reduced, the space can be saved, and the resource consumption can be reduced.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a fingerprint image processing method and processing device. Background technique [0002] At present, minutiae-based fingerprint recognition algorithms are widely used, and its processing mainly includes fingerprint image preprocessing, feature extraction, feature comparison, etc. Fingerprint image preprocessing includes calculation of direction field, enhanced filtering, binarization and other processing steps. Enhanced filtering and binarization are two important processing steps in fingerprint identification, and the processing results directly affect the final fingerprint comparison effect. [0003] There are many fingerprint image enhancement methods, such as: spatial domain enhancement method, frequency domain enhancement method and Gabor filter enhancement method, etc., wherein the commonly used method is the fingerprint image enhancement method based on Gabor filter propo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
Inventor 单成坤杨春林牛纪祥周军
Owner BEIJING EYECOOL TECH CO LTD
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