Scene Understanding for Dimensional Compliance Checks in Mixed-Reality
Abstract
:1. Introduction
Hardware | ODG R9 [23] | Microsoft HoloLens 2 [24] | Magic Leap 2 [25] | Nreal Varjo XR-4 [26] | DAQRI Smart Glasses |
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Year available | 2018 | 2019 | 2022 | 2023 | Discontinued [20] |
Display |
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Sensors |
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Camera |
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Weight |
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Battery Life |
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Retail price |
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Availability |
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Developer community/tools |
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Others |
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2. Materials and Methods
2.1. XR Applications in the AECO Industry
2.2. Current Technologies for Dimensional Checks for Regulatory Compliance
2.3. Regulatory Compliance Dimensional Requirements
2.4. Microsoft HoloLens 2 Hardware, Spatial Mapping, and Scene Understanding
2.5. Research Methodology
MR Application Development
3. Results
3.1. MR Application—Computing Measurements
3.2. Rule-Based Compliance Check
3.3. Automatically Computed Staircase Measurements against Conventional Measurements
3.4. Experimental Results by Volunteers
4. Discussion
4.1. Variability and Accuracy of Measurements
4.1.1. Riser Heights
4.1.2. Headroom
4.1.3. Staircase Width
4.2. Feasibility of Automating Measurements Using Meshes
- Changes in the environment during scanning are caused by people walking past and opening and closing of doors into the scanned space, as shown in Figure 17. The HoloLens 2 required substantial time to regenerate the space after such changes. Further studies would be required to determine the distinct amount of time required for the mesh to regenerate to reflect the original space;
- Gaps that were too small to be identified by the spatial map and were perceived as a surface by the HoloLens 2. This was evident at the left edge of the HFT1 L13 stairs, where there was a small void between the lowest horizontal rail and the staircase tread, as shown in Figure 18.
4.3. Limitations
4.3.1. Experiment Limitations
4.3.2. Technical Limitations
4.3.3. Hardware Limitations
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
Appendix A. Distinct Measurement Values by Location
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Country | USA | UK | Singapore | |
---|---|---|---|---|
Design Parameter | OSHA 1 | BS 5395-1: 2010 2 | Approved Document V7.03 3 | Accessibility Code 2019 |
Max. riser height | 240 mm | 190 mm a | 175 mm b | 150 mm |
Min. width | 560 mm | 1000 mm a | 1000 mm c | 900 mm |
Min. headroom | 2030 mm | 2000 mm | 2000 mm d | 2000 mm |
Building Feature | Tool | Location | Expected Value (mm) | Mean Absolute Error (mm) | Mean Absolute Error (%) | Mean (mm) | Standard Deviation (mm) |
---|---|---|---|---|---|---|---|
Riser Height | Conventional | HFT1 L13 | 175 | 3 | 1.8% | 173 | 3 |
Riser Height | MR | HFT1 L13 | 175 | 2 | 1.4% | 176 | 3 |
Riser Height | Conventional | HFT1 B1 | 170 | 2 | 1.1% | 169 | 3 |
Riser Height | MR | HFT1 B1 | 170 | 4 | 2.3% | 173 | 4 |
Stair Width | Conventional | HFT1 L13 | 1015 | 5 | 0.5% | 1015 | 7 |
Stair Width | MR | HFT1 L13 | 1015 | 81 | 7.9% | 956 | 123 |
Stair Width | Conventional | HFT1 B1 | 1025 | 3 | 0.3% | 1035 | 21 |
Stair Width | MR | HFT1 B1 | 1025 | 73 | 0.2% | 1001 | 98 |
Stair Width | Conventional | HFT1 B1 | 1070 | 2 | 7.1% | 1069 | 3 |
Stair Width | MR | HFT1 B1 | 1070 | 192 | 17.9% | 1007 | 133 |
Headroom | Conventional | HFT1 B1 | Varies | 22 | - | - | - |
Headroom | MR | HFT1 B1 | Varies | 115 | - | - | - |
Headroom | Conventional | HFT1 L13 | 3470 | 69 | 2.0% | 3467 | 81 |
Headroom | MR | HFT1 L13 | 3470 | 160 | 4.6% | 3571 | 195 |
Headroom | Conventional | HFT1 L13 | 3600 | 14 | 0.4% | 3598 | 21 |
Headroom | MR | HFT1 L13 | 3600 | 52 | 1.5% | 3592 | 64 |
Headroom | Conventional | HFT1 B1 | 2090 | 4 | 0.2% | 2087 | 5 |
Headroom | MR | HFT1 B1 | 2090 | 30 | 1.4% | 2120 | 13 |
Headroom | Conventional | HFT1 L13 | 2690 | 6 | 0.2% | 2692 | 9 |
Headroom | MR | HFT1 L13 | 2690 | 21 | 0.8% | 2711 | 5 |
Building Feature | Tool | Location | Expected Value (mm) | Mean—Scale Factor = 0.988 (mm) | Mean Absolute Error—Scaled (mm) | Mean Absolute Error—Scaled (%) | Observed Scale Factor against Measured Values | Observed Scale Factor against Expected Values |
---|---|---|---|---|---|---|---|---|
Riser Height | Conventional | HFT1 L13 | 175 | - | - | - | - | - |
Riser Height | MR | HFT1 L13 | 175 | 174 | 3 | 1.4% | 0.9836 | 0.9963 |
Riser Height | Conventional | HFT1 B1 | 170 | - | - | - | - | - |
Riser Height | MR | HFT1 B1 | 170 | 171 | 3 | 1.7% | 0.9751 | 0.925 |
Stair Width | Conventional | HFT1 L13 | 1015 | - | - | - | - | - |
Stair Width | MR | HFT1 L13 | 1015 | 945 | 85 | 8.4% | 1.0576 | 1.0577 |
Stair Width | Conventional | HFT1 B1 | 1025 | - | - | - | - | - |
Stair Width | MR | HFT1 B1 | 1025 | 989 | 69 | 6.8% | 1.0327 | 1.0230 |
Stair Width | Conventional | HFT1 B1 | 1070 | - | - | - | - | - |
Stair Width | MR | HFT1 B1 | 1070 | 995 | 204 | 18.9% | 1.0583 | 1.0592 |
Headroom | Conventional | HFT1 B1 | Varies | - | - | - | - | - |
Headroom | MR | HFT1 B1 | Varies | - | - | - | - | - |
Headroom | Conventional | HFT1 L13 | 3470 | - | - | - | - | - |
Headroom | MR | HFT1 L13 | 3470 | 3528 | 150 | 4.3% | 0.9699 | 0.9709 |
Headroom | Conventional | HFT1 L13 | 3600 | - | - | - | - | - |
Headroom | MR | HFT1 L13 | 3600 | 3549 | 51 | 1.4% | 1.0016 | 1.0022 |
Headroom | Conventional | HFT1 B1 | 2090 | - | - | - | - | - |
Headroom | MR | HFT1 B1 | 2090 | 2094 | 8 | 0.4% | 0.9844 | 0.9859 |
Headroom | Conventional | HFT1 L13 | 2690 | - | - | - | - | - |
Headroom | MR | HFT1 L13 | 2690 | 2679 | 11 | 0.4% | 0.9926 | 0.9920 |
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Lee, M.S.Z.; Yabuki, N.; Fukuda, T. Scene Understanding for Dimensional Compliance Checks in Mixed-Reality. CivilEng 2024, 5, 1-29. https://0-doi-org.brum.beds.ac.uk/10.3390/civileng5010001
Lee MSZ, Yabuki N, Fukuda T. Scene Understanding for Dimensional Compliance Checks in Mixed-Reality. CivilEng. 2024; 5(1):1-29. https://0-doi-org.brum.beds.ac.uk/10.3390/civileng5010001
Chicago/Turabian StyleLee, Michelle Siu Zhi, Nobuyoshi Yabuki, and Tomohiro Fukuda. 2024. "Scene Understanding for Dimensional Compliance Checks in Mixed-Reality" CivilEng 5, no. 1: 1-29. https://0-doi-org.brum.beds.ac.uk/10.3390/civileng5010001