3D Annotation Tools for Accurate Multi-Floor Building Reconstruction
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Solution Overview
Problem
Existing methods struggle to accurately generate geometric models of multi-floor buildings from multiview imagery, particularly in reconstructing buildings with multiple sections that have substantially flat roof areas, often resulting in inaccuracies such as gaps or misaligned ground levels between adjacent sections.
Innovation Solution
An annotation platform and image processing engine are used to process multiview imagery, allowing users to annotate building features and generate 3D vector data by employing tools like extrusion, tracing, and parallel line tools, which project annotations into a three-dimensional coordinate space, ensuring accurate reconstruction of multi-floor buildings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated methods are used to generate geometric models from multiview imagery, then productivity is improved, but manufacturing precision deteriorates due to gaps and misaligned ground levels between adjacent building sections
Solution Approach 1:
The annotation process is divided into distinct tools and operations: extrusion tool for creating vertical elements, tracing tool for following building contours, and parallel line tool for maintaining geometric relationships. Each tool handles specific aspects of annotation independently, allowing specialized processing for different building features while maintaining overall model accuracy
Solution Approach 2:
The patent replaces manual geometric modeling with an automated annotation system that uses image processing and constraint-based reconstruction. The system automatically projects annotations into 3D space, applies geometric constraints, and generates vector data, substituting manual mechanical modeling operations with computational processes that maintain precision while improving productivity
2Ease of operation
If simple annotation methods are used, then ease of operation is improved, but measurement precision deteriorates in reconstructing multi-floor buildings with complex geometries
Solution Approach 1:
The annotation platform provides a unified interface with multiple annotation tools (extrusion, tracing, parallel line) that can handle various building types and complexities through a single system. This multi-functional approach allows users to annotate simple and complex structures using the same platform, maintaining ease of operation while achieving high measurement precision through the combined capabilities of different tools
Solution Approach 2:
The system introduces intermediate annotation elements and constraint mechanisms that bridge simple user actions and complex geometric reconstruction. Annotation tools serve as intermediaries that translate basic user inputs into precise geometric constraints, which are then processed by the image processing engine to generate accurate 3D models, thus maintaining operational simplicity while ensuring measurement precision
Data Source
AI summary
Methods and systems for generating geometric models of buildings with from multiview imagery are provided. An example method involves establishing a three-dimensional coordinate space for the multiview imagery, displaying, through an annotation platform, first and second images of the multiview imagery depicting the building from different points of view, providing, through the annotation platform, functionality for a user to provide user input comprising instructions that annotate the first and second images with at least two adjacent building sections of the building having roofs at different heights, and reconstructing, based on the user input received through the annotation platform, a geometric model comprising at least the two adjacent building sections.