Three-dimensional building model simplifying method based on roof contour line

A technology for building models and contour lines, which is applied in 3D modeling, details involving 3D image data, and image data processing. It can solve problems such as excessive manual intervention and difficulty in large-scale promotion, achieving high efficiency and good stability , high precision effect

Active Publication Date: 2020-08-07
ZHEJIANG UNIV OF TECH
View PDF5 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of semi-automatic and fully automatic simplified systems have achieved certain results in recent years, but semi-automatic systems require too much human intervention, while fully automatic systems

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Three-dimensional building model simplifying method based on roof contour line
  • Three-dimensional building model simplifying method based on roof contour line
  • Three-dimensional building model simplifying method based on roof contour line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] With reference to accompanying drawing, further illustrate the present invention:

[0025] A 3D building model simplification method based on the roof outline, including the following steps:

[0026] Step 1. First extract the triangular patch of the roof surface, then use the Alpha Shapes algorithm to extract the rough contour line, and then simplify and regularize the thick contour line;

[0027] Step 2, adopt the improved RANSAC algorithm to carry out clustering and segmentation of roof surfaces, and then obtain the adjacency relationship between roof surfaces through the inner contour line extraction method;

[0028] Step 3. Correct each feature line segment according to the "vertex coincidence", "virtual intersection" and "over-intersection" relationships between the inner and outer contour lines, and sequentially connect to obtain plane primitives;

[0029] Step 4. For the non-planar primitives, process and simplify them into rectangular and other planar primitive...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A three-dimensional building model simplification method based on a roof contour line comprises the following steps: step 1, firstly, extracting a triangular patch of a roof surface, then carrying outcontour line rough extraction by using an Alpha Shapes algorithm, and then simplifying and regularizing a rough contour line; step 2, carrying out roof clustering segmentation by adopting an improvedRANSAC algorithm, and then obtaining an adjacency relation between roof surfaces through an inner contour line extraction method; step 3, correcting each feature line segment according to the relationship of vertex superposition, virtual intersection and over intersection between the inner and outer contour lines, and sequentially and orderly connecting the feature line segments to obtain a planeelement; step 4, for the non-planar primitives, processing and simplifying the non-planar primitives into rectangular isoplanar primitives through an integrity detection method; and step 5, finally,restoring elevation values of vertexes of all planar primitives and non-planar primitives, respectively projecting each vertex to the ground, and then connecting the corresponding vertexes to form a final simplified model. According to the invention, the data volume can be reduced.

Description

technical field [0001] The present invention relates to the field of computer graphics, in particular to an automatic simplification method for a three-dimensional building model using computer technology, which can automatically simplify the three-dimensional building model reconstructed by oblique photogrammetry into a regular building without relying on other prior information . Background technique [0002] With the popularity of UAVs, tilt photogrammetry technology has been widely used in the field of surveying and mapping. The technology uses the Structure of Motion (SfM) and Multi-View Stereo (MVS) methods in graphics to reconstruct a high-precision 3D city model through multiple sets of drone aerial photos, which greatly promotes the development of smart cities. Typical SfM and MVS methods first automatically extract and match the features between each pixel of the input image geometry, then restore the internal and external camera parameters in the picture, and the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06T17/20
CPCG06T17/20G06T2210/04G06T2200/04
Inventor 陆鹏飞陈佳舟朱志凌黄奕涵秦绪佳
Owner ZHEJIANG UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap