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Fingerprint image filtering method and device applied to fingerprint sensor

A fingerprint sensor and fingerprint image technology, which is applied in the field of fingerprint image filtering, can solve problems such as large noise in fingerprint images, affect fingerprint image recognition, and poor filtering effect, and achieve the effects of improving quality, improving filtering effect, and reducing the impact of noise

Active Publication Date: 2019-08-23
SHENZHEN CHIPSAILING TECH CO LTD
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Problems solved by technology

[0004] However, due to the noise of the circuit itself and the influence of environmental interference, the scanned fingerprint image often has a lot of noise, which will affect the recognition of subsequent fingerprint images
At present, one-dimensional or two-dimensional spatial filtering is generally used to achieve denoising. However, when the interference in a certain time window is serious, the filtering effect of the traditional one-dimensional or two-dimensional spatial filtering is poor, which will make a block or a row with a lot of non-filterable noise

Method used

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  • Fingerprint image filtering method and device applied to fingerprint sensor
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  • Fingerprint image filtering method and device applied to fingerprint sensor

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Embodiment Construction

[0023] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] An embodiment of the present invention provides a fingerprint image filtering method applied to a fingerprint sensor, including: during the process of scanning the pixels in the fingerprint sensor, sampling each scanned pixel for N times, wherein Not less than 1; carry out cumulative average on the N sampling results of the...

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Abstract

The invention discloses a fingerprint image filtering method and device applied to a fingerprint sensor, wherein the fingerprint image filtering method includes: during the process of scanning the pixels in the fingerprint sensor, performing a separate N times of sampling, wherein said N is not less than 1; N times of sampling results of the same pixel are accumulated and averaged, and the result of the accumulation and average is used as the scanning result of the corresponding pixel; based on the scanning results of each pixel obtained by scanning. Filter processing, in order to obtain the fingerprint image after filtering. The technical scheme provided by the invention can effectively improve the filtering effect of the fingerprint image.

Description

technical field [0001] The invention relates to the technical field of fingerprint sensors, in particular to a fingerprint image filtering method and device applied to the fingerprint sensor. Background technique [0002] The fingerprint sensor is a key device to realize the automatic collection of fingerprint images. Due to the uniqueness of the fingerprint image, the fingerprint sensor is widely used in the field of identification. [0003] In the application of the fingerprint sensor, after the fingerprint sensor finishes scanning the fingerprint image, it will upload the scanned fingerprint image to the host (such as the main control chip of the host) for processing. The end reports RAW (that is, unprocessed) image data, and the image data is filtered and enhanced by the host end. [0004] However, due to the noise of the circuit itself and the influence of environmental interference, the scanned fingerprint image often has a lot of noise, which will affect the identifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06V40/1347
Inventor 于泽
Owner SHENZHEN CHIPSAILING TECH CO LTD
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