Finger three-dimensional model texture mapping method based on UV mapping

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

Active Publication Date: 2021-06-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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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

Method used

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  • Finger three-dimensional model texture mapping method based on UV mapping
  • Finger three-dimensional model texture mapping method based on UV mapping
  • Finger three-dimensional model texture mapping method based on UV mapping

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Experimental program
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Embodiment

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

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

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

[0057]

[0058] Step S2, obtain all triangular faces from the three-dimensional mesh model of the finger, and obtain the three vertices V corresponding to each triangular face i , to obtain the set f of...

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Abstract

The invention provides a finger three-dimensional model texture mapping method based on UV mapping, and the method comprises the following steps: obtaining a coordinate set and a triangular patch set of all vertexes forming a finger contour from a finger three-dimensional grid model; selecting original points of coordinate systems of any three cameras to establish a space plane, and solving an equation of the space plane where all the cameras are located; mapping triangular patch textures of the model from three dimensions to two dimensions, and performing interpolation and average gray value processing; and writing the obtained two-dimensional texture information back to the texture-free finger model in a UV mapping manner to obtain a finger three-dimensional grid model with the texture information. The finger three-dimensional mesh model reconstructed by the method basically retains complete finger texture and fits actual human fingers, finger feature information can be less lost, the influence of finger recognition caused by finger postures and positions can be effectively solved, and the finger three-dimensional mesh model has a great effect on improvement of finger recognition precision.

Description

technical field [0001] The invention relates to the technical field of biological feature identification, and more specifically, relates to a texture mapping method of a three-dimensional finger model based on UV mapping. Background technique [0002] Three-dimensional reconstruction refers to the establishment of a mathematical model suitable for computer representation and processing of three-dimensional objects, so as to obtain the three-dimensional structure and information of the object. It has achieved very successful applications in many aspects. At the same time, with the development of science, people have a stronger awareness of the protection of their property and information, and there are more and more occasions that require identity authentication. [0003] As a kind of identification technology, biometric identification has been widely used, and the identification method based on finger has its unique advantages. Today's traditional finger recognition methods...

Claims

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Application Information

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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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