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Cross matching fingerprint image scaling method based on global ridge distance

A fingerprint image, cross-matching technology, applied in image analysis, image data processing, graphic image conversion and other directions, can solve the problem that the noise of different resolutions of the collector cannot be matched normally, and achieve the effect of simple method, high performance and application promotion.

Active Publication Date: 2014-04-23
INST OF AUTOMATION CHINESE ACAD OF SCI
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Problems solved by technology

[0006] In order to solve the problem that in the cross-matching of multiple collectors, due to the different noises of the collector resolutions, the problem that the noise cannot be matched normally, the present invention provides a cross-matching fingerprint scaling method based on the global ridge distance

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  • Cross matching fingerprint image scaling method based on global ridge distance
  • Cross matching fingerprint image scaling method based on global ridge distance
  • Cross matching fingerprint image scaling method based on global ridge distance

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Embodiment Construction

[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0020] figure 1 Is the flowchart of the fingerprint image scaling method based on the global ridge distance. Such as figure 1 As shown, the fingerprint image scaling method based on the global ridge distance proposed by the present invention includes the following steps:

[0021] Step S1, block the input fingerprint image to obtain multiple image blocks;

[0022] For an input fingerprint image I, divide it into non-overlapping image blocks g of size W×W (W=32) i (x, y), where x, y∈{0,...,W-1}, i=1,...,N, where W represents the size of the block, and N represents the image after block number of blocks. For an input fingerprint image, the block rule is to block the image from left to right and from top to bottom, and f...

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Abstract

The invention discloses a cross matching = fingerprint image scaling method based on global ridge distance. The method comprises the following steps of: partitioning the input fingerprint image; calculating the energy spectrum of the image blocks; enhancing the energy spectrum by root filtering; calculating the radial energy distribution of the enhanced energy spectrum to obtain the ridge distance of the image blocks; based on the consistency of the direction field of the image blocks, calculating the global ridge distance of the input fingerprint image; for two input fingerprint images to be matched, performing fingerprint image scaling according to the obtained global ridge distance. The method provided by the invention is simple, and has universality to the images acquired by different acquisition instruments; the result of the method is intuitive; and the method can realize fingerprint image scaling in cross matching of multiple acquisition instruments, and improves the performance of a multi-acquisition instrument cross matching algorithm.

Description

technical field [0001] The invention belongs to the field of biological feature identification, in particular to a cross-matching fingerprint image scaling method based on global ridge distance. Background technique [0002] Due to its uniqueness, persistence and universality, fingerprints have been increasingly used for identity authentication in government or civil fields. Recently, great progress has been made in fingerprint collection and automatic fingerprint identification. According to the imaging principle, fingerprint collectors can be divided into capacitive collectors, thermal energy collectors and ultrasonic collectors, etc. According to the collection mode, they can be divided into press collectors (rolling press, flat press, and whole hand press), scratch collectors and non-contact fingerprint collectors. contact collector, etc. The development of collection technology enables people to use a variety of collection instruments to realize online collection of f...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/40G06T7/00
Inventor 田捷陶训强杨鑫
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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