Research On The Recognition And Processing Of Voxel In 3D Reconstruction

The wide application of CAD/CAM and 3D printing makes 3D modeling attract people's attention in the fields of machinery,architecture,aerospace and other fields.Before the emergence of 3D modeling,product design relied on 2D engineering drawings.How to link the 2D engineering drawings with the 3D models and transform the 2D data into 3D data models is an urgent problem to be solved.The core of computer automatic recognition and understanding 2D engineering drawing is to use knowledge representation,graph matching,geometric reasoning,semantic extraction and other technologies to automatically obtain various display descriptions and hidden engineering graphic element information in engineering drawings.The use of computer-based automatic recognition can solve the shortcomings of low efficiency,poor accuracy,and dependence on the operator's engineering experience and expertise in the process of human-machine interaction extraction of graphic information.It can quickly and efficiently extract spatial information of three-dimensional entities and improve the efficiency of three-dimensional reconstruction..Based on the study of three-dimensional reconstruction of views,the model guidance method is a practical and promising method.The model-guided method includes the identification of basic voxels and Boolean operations between voxels.This paper focuses on the issue of automatic recognition of basic voxels.The key to computer automatic identification of voxel projections is the search for closedloop graphics in views and the extraction of voxel projections.This paper analyzes the existing closed-loop search algorithm and three-dimensional reconstruction method,and studies the closed-loop view and voxel reconstruction of the view.The main work is:(1)Analyze the structural features of the basic voxel and the projection features of the three views,and build a knowledge base for the projection of the basic voxels for various projection position relationships.(2)This paper proposes a basic voxel projection search method based on feature-elementdriven.The method first traverses three views to find a feature element,and uses it as the main feature of the basic voxel projection.Then it adopts closed-loop search according to the law of three-view projection.The method gradually extracts closed-loop graphics in the view.If it can match the basic volume projection in the knowledge base,the closed-loop graphics are taken as other projections of the basic voxels;if they do not match the basic volume projections in the knowledge base,then,the other projections of the basic voxels are obtained based on the closed-loop graphical features and matching the basic voxel projection features of the knowledge base.(3)Matching the three projections of the basic voxel and the projected knowledge base to complete the voxel recognition,and then using the coordinate transformation to extract the voxel geometric parameters,lay the foundation for the three-dimensional reconstruction of complex entities.This paper takes VC++6.0 as the development platform and Open GL function library as the tool to verify the algorithm proposed in this paper,and proves the reliability and feasibility of the algorithm proposed in this paper.