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Judgment method and device for quality of fingerprint images

A fingerprint image and judging device technology, applied in the field of communication, can solve the problem of inability to judge the quality of fingerprint images, and achieve the effects of improving the fingerprint recognition rate, reducing the false recognition rate, and improving the expansion ability.

Inactive Publication Date: 2015-01-07
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology

Therefore, the method for judging the quality of fingerprint images in the prior art cannot accurately judge the quality of fingerprint images in small-sized fingerprint collection devices (or systems).

Method used

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  • Judgment method and device for quality of fingerprint images
  • Judgment method and device for quality of fingerprint images
  • Judgment method and device for quality of fingerprint images

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Embodiment Construction

[0037] It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0038] The fingerprint image quality judgment method of the present invention considers that HOG (Histogram of Oriented Gradient, gradient direction histogram) features describe the image gradient direction distribution, which is an effective texture statistical feature. Therefore, the HOG feature is introduced and the SVM supervised learning mode is adopted. It has successfully distinguished the quality of fingerprint images and realized accurate judgment of fingerprint image quality in small-size fingerprint collection devices.

[0039] See figure 1 , An embodiment of the fingerprint image quality judgment method of the present invention is provided. The judgment method includes the following steps:

[0040] Step S101: Obtain a fingerprint image sample

[0041] The fingerprint image samples include positive and negati...

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Abstract

The invention discloses a judgment method and device for the quality of fingerprint images. The judgment method includes the step of obtaining fingerprint image samples, the step of carrying out learning according to the fingerprint image samples by using an SVM classifier to obtain the optimal classification face, the step of obtaining the images to be judged and calculating histogram of oriented gradient (HOG) characteristics of the fingerprint images, and the step of judging the quality of the fingerprint images according to the HOG characteristics and the optimal classification face. Thus, the quality of the fingerprint images is accurately judged in small size fingerprint acquisition equipment, the work of manually determining and judging threshold values is omitted, good expansion capability is achieved, influences brought by various types of noise can be determined in the judgment mode, judgment can be completed just by inputting required sample types, an excellent effect is exerted in a lot of experiments, and a solid foundation is laid for improving the fingerprint recognition rate and lowering the false acceptance rate.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for judging fingerprint image quality. Background technique [0002] Fingerprint recognition technology has begun to be widely used in mobile terminals, and for mobile terminal fingerprint recognition, recognition algorithms are the core technology. Due to the limitation of the fingerprint collection sensor, when the finger is stained with sweat or mud, the recognition rate will be greatly reduced. Especially for small-size fingerprint collection devices such as mobile terminals, the recognition algorithm is more dependent on the quality of the input fingerprint image. The higher the recognition rate is, the lower the false recognition rate is. Therefore, the judgment of the fingerprint image quality before recognition is particularly important. [0003] The traditional judgment method firstly counts the characteristic indexes such as the mean value, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/62
CPCG06V40/1365G06F18/2411
Inventor 姜洪霖王兵
Owner SHENZHEN GOODIX TECH CO LTD
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