Three-dimensional reconstruction method and system capable of maintaining sharp features

A 3D reconstruction and sharpening technology, which is applied in computer graphics, reverse engineering, computer-aided geometric design, and computer vision, can solve problems such as inability to fully maintain sharp features near edges, increased reconstruction time, and poor robustness.

Active Publication Date: 2017-09-01
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a three-dimensional reconstruction method and system for maintaining sharp features, aiming at solving the problems in the existing three-di...

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  • Three-dimensional reconstruction method and system capable of maintaining sharp features
  • Three-dimensional reconstruction method and system capable of maintaining sharp features
  • Three-dimensional reconstruction method and system capable of maintaining sharp features

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specific Embodiment

[0117] The overall process of the inventive method is as figure 1 As shown, the main body of the method of the present invention includes three parts: 1. The method for removing outliers in the point cloud based on the improved region growing method in point cloud preprocessing; 2. Based on neighborhood search and boundary point detection in point cloud merging A method for merging point clouds; 3. A method for maintaining sharp edge features of the reconstructed model based on feature point detection and adaptive step update in surface reconstruction.

[0118] 1. Remove outliers from the point cloud

[0119] After point cloud smoothing and filtering, the operation of removing outliers from the point cloud is used to process the point cloud in the point cloud data that is far away from the main point cloud and the point cloud that is close to the main point cloud but has a relatively sparse point cloud density. The flow chart of point cloud removal outliers is as follows: i...

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Abstract

The present invention discloses a three-dimensional reconstruction method and system capable of maintaining sharp features. The method includes the following steps that: 1) a two-dimensional image filtering method extended to a three-dimensional space is adopted to perform smoothing de-noising on inputted roughly-registered point cloud; 2) an improved region growth method is adopted to perform outlier removal on the smoothed roughly-registered point cloud; 3) a kd-tree (k-dimensional tree) acceleration-based ICP (iterative closest point) algorithm is adopted to perform precise registration on the outlier-removed roughly-registered point cloud; 4) a neighborhood search and boundary point detection-based fusion method is adopted to fuse the precisely-registered point cloud; and 5) a feature point detection and adaptive step size update-based method is adopted to perform surface reconstruction on the fused precisely-registered point cloud. The three-dimensional reconstruction system is composed of a point cloud preprocessing module, a point cloud combining module and a surface reconstruction module. The three-dimensional reconstruction system which is realized based on the method of the invention can maintain the sharp features of the edge of a reconstructed model, and therefore, reconstruction speed is considered with accuracy ensured.

Description

technical field [0001] The invention belongs to the fields of computer graphics, computer vision, reverse engineering and computer-aided geometric design, and specifically relates to a three-dimensional reconstruction method and system for maintaining sharp features. Background technique [0002] Three-dimensional reconstruction technology refers to the technology of establishing a suitable mathematical representation and processing model for an object on a computer, and objectively reproducing a real object in a computer. [0003] According to the differences in the acquisition methods of 3D point cloud data, 3D reconstruction techniques can be roughly divided into the following two types: 3D reconstruction based on multiple images and 3D reconstruction based on point cloud data with depth information. 3D reconstruction based on multiple images collects images through the camera to obtain sequence images of different angles of the object to be reconstructed, estimates the p...

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Application Information

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IPC IPC(8): G06T17/30G06T19/20
CPCG06T17/30G06T19/20
Inventor 刘琼吴铭荃
Owner SOUTH CHINA UNIV OF TECH
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