3D Modeling Device Boundary Extraction for Hidden Surface Reconstruction
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Solution Overview
Problem
Existing three-dimensional modeling techniques struggle to generate accurate models of indoor spaces when objects are partially hidden by large objects or thermally insulating materials, leading to incomplete or inaccurate measurements due to noise and small obstacles.
Innovation Solution
A modeling device and method that uses a 3D laser scanner to obtain measurement data, extracts mathematical formulas representing flat surfaces, and eliminates deviated measurement points by determining boundaries and redetermining surface formulas using extracted points within a predetermined width from these boundaries, allowing for the generation of shape models even when parts of the object are hidden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement is performed in indoor spaces with objects installed, then structural lines can be recovered stably even with noise or small obstacles, but regions are partially lacked due to presence of large objects that block measurement
Solution Approach 1:
The patent segments the measurement process into multiple stages: initial measurement to detect visible surfaces, boundary determination to identify regions obscured by large objects, and virtual extension to reconstruct hidden regions. This segmentation allows the system to handle both visible and hidden areas systematically, resolving the contradiction between reliability in visible regions and completeness in hidden regions.
Solution Approach 2:
The patent performs preliminary measurement and boundary determination before attempting to reconstruct hidden regions. By first establishing the boundaries of visible surfaces and identifying where large objects block measurement, the system can then virtually extend surfaces to recover structural lines in hidden regions, ensuring reliable reconstruction based on predetermined boundaries.
2Measurement precision
If measurement is performed with objects installed in the indoor room, then structural lines can be detected, but accurate measurement for replacement of cloth or installation of thermally insulating material cannot be achieved
Solution Approach 1:
The patent dynamically adapts the measurement process based on the measurement purpose. When the purpose is structural line detection, the system utilizes visible surfaces and detected boundaries. When the purpose requires complete surface measurement (such as for cloth replacement or insulation installation), the system virtually extends surfaces to reconstruct hidden regions, providing adaptability to different measurement needs while maintaining precision.
3Measurement precision
If all measurement points on a surface are used to determine mathematical formula, then noise and deviated points affect accuracy, but excluding points reduces measurement completeness
Solution Approach 1:
The patent applies local quality by determining boundaries and using only measurement points within predetermined widths from these boundaries for mathematical formula determination. This local approach ensures that points are selected based on their proximity to verified surface boundaries, improving accuracy by excluding deviated points while maintaining completeness by systematically selecting points from the valid boundary regions.
Data Source
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AI summary
An object of the present invention would be to determine an accurate shape model even if measurement points of only part of a surface are obtained. The modeling device (10) according to the present invention includes a data obtainer (11), a surface extractor (12), and a modeler (13). The surface extractor (12) determines, by use of mathematical formulae representing a first surface (3) and second surfaces (3) surrounding the first surface (3), of the three-dimensional object (30), boundaries surrounding the first surface (3). The surface extractor (12) extracts, from measurement points belonging to the first surface (3), measurement points relating to a region (D1) inside the first surface (3) and having a predetermined width (W1) from the boundaries.