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Coordinate transformation method for under-screen imaging, storage medium and electronic equipment

A technology of coordinate transformation and imaging, applied in image enhancement, image analysis, image data processing, etc., can solve the problem of fingerprint image fingerprint inconsistency, achieve the effect of fast restoration, simple calculation process, and ensure clarity

Active Publication Date: 2020-03-20
SHANGHAI HARVEST INTELLIGENCE TECH CO LTD
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Problems solved by technology

[0004] For this reason, it is necessary to provide a coordinate transformation method for off-screen imaging to solve the problem of inconsistency between the fingerprint image obtained by optical fingerprint recognition under the lensless screen and the actual fingerprint

Method used

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  • Coordinate transformation method for under-screen imaging, storage medium and electronic equipment
  • Coordinate transformation method for under-screen imaging, storage medium and electronic equipment
  • Coordinate transformation method for under-screen imaging, storage medium and electronic equipment

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Embodiment Construction

[0033] In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.

[0034] The core technical concept of the present invention is: calculate the magnification factor k of the image imaging structure under the screen, if the obtained fingerprint image is simply reduced by k times, the fingerprint image with the same size as the actual fingerprint can indeed be obtained, but the loss of pixels, Its clarity is greatly affected. Therefore, the present invention mainly moves the fingerprint image obtained by the image imaging structure under the screen to a new coordinate system (reduced by k times) mainly through the transformation of the coordinate system, so as to ensure that the finally obtained fingerprint image is the same size as the actual fingerprint. It can also ensure that its clarity has not be...

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Abstract

The invention relates to the technical field of optical fingerprint identification, in particular to a coordinate transformation method for under-screen imaging, a storage medium and electronic equipment. The coordinate transformation method for under-screen imaging comprises the following steps: calculating a coordinate system reduction coefficient; copying each bright spot on the fingerprint image to the reduced coordinate system; and keeping the relative distance between the fingerprint information around the bright spot and the center of the bright spot unchanged, and integrally moving thefingerprint information to the shrunk coordinate system. Through coordinate conversion, restoration of the fingerprint image is guaranteed, meanwhile, it is guaranteed that pixels cannot be lost, andthe definition of the restored fingerprint image is guaranteed. And the mode of restoring the fingerprint image is simple in calculation process, high in restoration speed and good in quality.

Description

technical field [0001] The invention relates to the technical field of optical fingerprint identification, in particular to a coordinate transformation method, storage medium and electronic equipment for under-screen imaging. Background technique [0002] With the development of information technology, biometric identification technology is playing an increasingly important role in ensuring information security. Among them, fingerprint identification has become one of the key technical means for identification and device unlocking widely used in the mobile Internet field. Under the trend of increasing screen-to-body ratio of devices, traditional capacitive fingerprint recognition can no longer meet the demand, while ultrasonic fingerprint recognition has problems in terms of technology maturity and cost. Optical fingerprint recognition is expected to become an under-screen fingerprint Identify mainstream technical solutions. [0003] Existing optical fingerprint recognition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06T5/00
CPCG06T5/001G06V40/1335G06V40/1324G06V40/1318G06T2207/20021G06T2207/30196
Inventor 陈宗文
Owner SHANGHAI HARVEST INTELLIGENCE TECH CO LTD
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