Fingerprint imaging method and fingerprint imaging system

An imaging method and imaging system technology, which are applied in the acquisition/organization of fingerprints/palmprints, print image acquisition, character and pattern recognition, etc. Quality, good clarity

Inactive Publication Date: 2019-11-15
SHANGHAI OXI TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] However, the imaging system of the existing optical fingerprint recognition equipment can only collect fingerprint images under suitable lighting conditions, and cannot

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  • Fingerprint imaging method and fingerprint imaging system
  • Fingerprint imaging method and fingerprint imaging system
  • Fingerprint imaging method and fingerprint imaging system

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Embodiment Construction

[0050] It can be known from the background technology that the existing fingerprint imaging system has the problem of being unable to obtain the fingerprint image under the condition of strong ambient light. Now, combined with the principle of fingerprint image imaging, the cause of the problem is analyzed: figure 1 As mentioned above, the existing fingerprint imaging system reflects and transmits the incident light 31 on the contact surface between the protective glass 2 and the irradiated human finger 1, and the reflected light forms reflected light 12 and returns to the optical image sensor 4; The light cannot be received by the optical image sensor 4, so that an image formed only by reflected light 12 is formed on the imaging surface of the optical image sensor 4, and the image is consistent with the contact surface of the protective glass 2 and the irradiated human finger 1, The characteristics of the contact surface reflect the fingerprint characteristics of the human bod...

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Abstract

The invention discloses a fingerprint imaging method and a fingerprint imaging system, and the method comprises the steps: starting backlight, and collecting an optical signal at first collection time, so as to obtain a first image; turning off the backlight, and acquiring the optical signal at a second acquisition time to obtain a second image; and obtaining a fingerprint image based on the firstimage and the second image. In the technical scheme of the invention, the definition of the first image is relatively high in the absence of a strong light environment; the definition of the second image is relatively high in a strong light environment; the fingerprint image obtained according to the first image and the second image can obtain better definition in various light intensity environments, particularly, the quality of the fingerprint image obtained in a strong light environment can be ensured, and a good foundation can be provided for subsequent identity recognition according to the fingerprint image.

Description

technical field [0001] The invention relates to the field of fingerprint identification, in particular to a fingerprint imaging method and a fingerprint imaging system. Background technique [0002] Fingerprint imaging recognition technology is to collect the fingerprint image of the human body through the fingerprint sensor, and then compare it with the existing fingerprint imaging information in the system to judge whether it is correct or not, and then realize the technology of identity recognition. Due to its ease of use and the uniqueness of human fingerprints, fingerprint recognition technology has been widely used in various fields. For example, security inspection areas such as public security bureaus and customs, building access control systems, and consumer products such as personal computers and mobile phones, etc. [0003] Fingerprint imaging technology is implemented in various ways such as optical imaging, capacitive imaging, and ultrasonic imaging. Relativel...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/20
CPCG06V40/1347G06V40/1318G06V10/141G06V10/147
Inventor 曲志刚朱虹
Owner SHANGHAI OXI TECH
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