Finger vein three-dimensional point cloud obtaining method and device and terminal

Abstract

The embodiment of the invention discloses a finger vein three-dimensional point cloud obtaining method and device. The method includes the steps of obtaining a plurality of finger vein images, wherein the number of the finger vein images is at least two, the finger vein images are continuously shot by a camera when the finger moves in the length direction of the finger under irradiation of a light source, and the light source and the camera are located on the same side of the finger; selecting two images with dimensional consistency from the finger vein images; according to the two images with the dimensional consistency, calculating to obtain part of space point coordinates of the finger veins to obtain part of three-dimensional point clouds of the finger veins; continuously selecting images from the surplus finger veins to add the images into the three-dimensional point clouds to complete finger vein three-dimensional point cloud rebuilding. According to the finger vein three-dimensional point cloud obtaining method and device, the finger vein images at different perspectives can be obtained, the finger vein three-dimensional point cloud rebuilding can be completed based on the finger vein images, three-dimensional characteristics of the finger veins is obtained, and the recognition rate of identity authentication can be further improved.

Description

technical field [0001] Embodiments of the present disclosure generally relate to the technical field of identity authentication, and in particular, relate to a method, a device, and a terminal for acquiring a three-dimensional point cloud of finger veins. Background technique [0002] With the popularity of various smart terminal devices, secure identity authentication is becoming more and more important. Traditional security authentication methods mainly include passwords / passwords. This external authentication method has poor security and it is difficult to guarantee that it will not be used by illegal users. In order to overcome this problem, the identification technology based on biometric features has developed rapidly, and finger vein recognition is a new biometric identification technology. [0003] Although human tissue does not transmit light under normal circumstances, it still has a certain degree of light transmission when illuminated by a strong light source, a...

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Problems solved by technology

[0004] However, the inventor found in the process of applying finger vein recognition technology that most of the relevant finger vein recognition schemes belong to two-dimensional recognition, that is, to identify the plane projection of finger veins, but the finger vein itself is a three-dimensional structure. The projection will be affected by the gesture of the finger and the distance from the camera, etc., resulting in large differences in the vein images taken each time, affecting the recognition rate

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