A texture mapping method of 3D finger model based on uv map

A technology of texture mapping and three-dimensional models, applied in the field of biometric identification, can solve the problems of limited finger image information, great influence, and easy to be forged, etc., to solve the impact of finger recognition, fast operation speed, and finger recognition accuracy Improved effect

Active Publication Date: 2022-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain deficiencies in this technical solution. First, the finger image information acquired by a single camera is limited. Second, the traditional fingerprint recognition method is greatly affected by the gesture and position of the finger, and has defects such as being easy to be forged.

Method used

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  • A texture mapping method of 3D finger model based on uv map
  • A texture mapping method of 3D finger model based on uv map
  • A texture mapping method of 3D finger model based on uv map

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Effect test

Embodiment

[0054] In this embodiment, a texture mapping method for a three-dimensional model of a finger based on UV mapping, the process is as follows figure 1 shown, including the following steps:

[0055] Step S1, from the three-dimensional mesh model of the finger, obtain the coordinate set {V i =(x i ,y i ,z i |i∈[1,n])}, where (x i ,y i ,z i ) is the vertex V i Coordinates in the 3D world coordinate system, n is the number of vertices; solve the center point O(x, y, z) of all vertices; at this time, the 3D mesh model of the finger can be a 3D mesh model of the finger without fingerprints, such as figure 2 shown.

[0056] The solution method for the O(x, y, z) coordinates of the center point is:

[0057]

[0058] In step S2, all triangular patches are obtained from the 3D mesh model of the finger, and three vertices V corresponding to each triangular patch are obtained. i , to get the set f of all triangular patches that make up the outline of the finger. All triangul...

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Abstract

The invention provides a texture mapping method for a three-dimensional finger model based on UV mapping, comprising the following steps: obtaining coordinate sets and triangular facet sets of all vertices that form the outline of the finger from the three-dimensional mesh model of the finger; selecting any three of them The origin of the camera coordinate system forms a space plane, and obtains the space plane equations where all cameras are located; maps the triangular patch texture of the model from 3D to 2D and performs interpolation and average gray value processing; and then converts the obtained 2D texture information into The way of UV mapping is written back to the non-textured finger model, and the 3D mesh model of the finger with texture information is obtained. The 3D mesh model of the finger reconstructed by this method basically retains the complete finger texture, fits the actual human finger, can reduce the loss of finger feature information, and can effectively solve the impact of finger recognition caused by finger posture and position. The improvement of finger recognition accuracy has a great effect.

Description

technical field [0001] The present invention relates to the technical field of biometric identification, and more particularly, to a texture mapping method for a three-dimensional model of a finger based on UV mapping. Background technique [0002] Three-dimensional reconstruction refers to a technology that establishes a mathematical model suitable for computer representation and processing of three-dimensional objects, so as to obtain the three-dimensional structure and information of objects, and has achieved very successful applications in many aspects. At the same time, with the development of science, people have a stronger awareness of protecting their own property and information, and there are more and more occasions where identity authentication is required. [0003] As an identity recognition technology, biometrics has been widely used, among which the fingerprint-based identity authentication method has its unique advantages. Today's traditional finger recogniti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/04G06T17/20
CPCG06T15/04G06T17/20
Inventor 王林丰杨伟力康文雄邓飞其
Owner SOUTH CHINA UNIV OF TECH
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