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Fingerprint image extraction method

A fingerprint image and extraction method technology, applied in the field of fingerprint image extraction, can solve the problems of reducing the recognition accuracy, deformation, and fingerprint image distortion of the background fingerprint comparison algorithm, so as to avoid deformation and proportional imbalance, reduce work links, and accurately performance and efficiency

Pending Publication Date: 2022-03-15
北京彼岸行舟国际教育科技有限公司
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AI Technical Summary

Problems solved by technology

[0006] The current fingerprint extraction methods require a lot of operations, each of which may cause distortion and deformation of the fingerprint image, thereby reducing the recognition accuracy of the background fingerprint comparison algorithm

Method used

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Embodiment Construction

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention specification. The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0033] The embodiment is divided into four parts:

[0034] 1. Set the interception frame and reference mark line segment.

[0035] 2. Adjust the shooting distance and zoom ratio, align the physical scale with the interception frame or the reference mark line, and take a photo.

[0036] 3. Capture the image, convert the image resolution according to the requirements, and save the original large fingerprint image.

[0037] 4. Send it to the fingerprint comparison application system for fi...

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Abstract

The invention discloses a method for acquiring a fingerprint image according to an original size, and belongs to the technical field of fingerprint automatic identification. According to the invention, the calculation processing capability of the mobile calculation equipment and the camera are used, and the size, direction and precision of the image are adjusted and corrected by placing the ruler with the standard scales beside the target object, so that the finally shot image can keep the original large size according to the precision required by use. The adjusted original large fingerprint image can be sent to a fingerprint and other biological characteristic comparison system for direct comparison so as to find an optimal candidate or find a biological characteristic owner of the fingerprint. The original size keeping of the fingerprint image refers to that under the condition of given image resolution, the size value of the shot object in the image is consistent with the actual size value of the shot object through precision and length conversion according to the point number of the image resolution containing the shot object. Resolution is typically represented using "X-point / inch".

Description

technical field [0001] The invention relates to the technical field of fingerprint automatic identification, and more specifically, relates to a method for extracting a fingerprint image. [0002] Keeping the original size of the fingerprint image means that in the case of a given image resolution, according to the resolution points of the image containing the object to be photographed, through the conversion of precision and length, the size value of the object to be photographed in the image is the same as that of the object to be photographed The actual size and dimension values ​​are consistent. Resolution is usually expressed in "dots / inch". Background technique [0003] There are two types of fingerprint identification comparison: 1:1 comparison and 1:N comparison. In a 1:1 comparison, there is only one registered fingerprint on a device, and an attempt will be made to match the user's fingerprint of the device with the registered fingerprint to verify that the user ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06V40/13G06T3/40
CPCG06T3/40
Inventor 翟晓峰
Owner 北京彼岸行舟国际教育科技有限公司
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