Three-dimensional fingerprint sensing system

Abstract

The invention discloses a three-dimensional fingerprint sensing system which is constructed on the basis of a strip projection phase measuring method and comprises hardware and software, wherein the hardware comprises a computer, a camera, a projector and a supporting frame; the computer is connected with the projector through an HDMI (High Definition Multimedia Interface) and is connected with the camera through a kilomega network interface; the supporting frame comprises a big base plate, a moveable plate, a camera frame base plate, a camera fixing plate, an upper base plate, a lower base plate and an angular displacement platform; the camera is fixed on the camera frame base plate and the camera fixing plate which are connected vertically; the camera frame base plate is fixedly connected with the moveable plate; the moveable plate is mounted at one end of the big base plate in a sliding mode; the projector is clamped between the upper base plate and the lower base plate; the angular displacement platform is connected with the lower base plate and is mounted at the other end of the big base plate; the relative mounting position and angle of the camera and the projector cause the central lines of lenses of the camera and the projector to meet the demand on a three-dimensional imaging principle; and the software mainly comprises the steps of image collecting, reading, storing, data analyzing, processing and three-dimensional displaying.

Description

technical field [0001] The invention relates to a non-contact three-dimensional measurement technology, in particular to a three-dimensional fingerprint sensing system based on a fringe projection phase measurement method. Background technique [0002] As a long-established identity authentication technology, fingerprint recognition has attracted much attention over the years. Due to the uniqueness, lifelong invariance of fingerprint information and its convenient and quick collection method, it is considered to be a quite universal identity authentication method. With the development of computer and optical scanning technology, computer image processing algorithms are more reliable, and the cost of imaging equipment is gradually reduced. In particular, the emergence of digital projectors has continuously optimized the image acquisition and processing system, and provided a basis for the development of modern three-dimensional optical measurement technology. good conditions...

AI Technical Summary

Problems solved by technology

The system is based on the fringe projection phase measurement method, which can avoid problems such as deformation of fingerprint information, uncertain information collection, and afterimages caused by extrusion, dry and wet fingers, and repeated contact during the contact fingerprint measurement process. Fast and accurate fingerprint image collection and transmission, and single camera, low cost, easy to use and easy to promote

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