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Precision of the CAESAR scan-extracted measurements
Kathleen M Robinette1, Hein A M Daanen2
1Air Force Research Laboratory, 2800 Q Street, Bldg 824, Wright-Patterson AFB, OH 45433-7947, USA.
Applied Ergonomics
|October 6, 2005
Summary
Precision of 3D body scanner measurements was evaluated using the CAESAR survey. Results show scanner-derived dimensions are highly reproducible and comparable to manual measurements, making them suitable for applications like custom clothing.
Area of Science:
- Anthropometry
- 3D Scanning Technology
- Ergonomics
Background:
- Three-dimensional (3D) body scanners are increasingly utilized for deriving 1D body dimensions from 3D scans.
- Applications include clothing grading systems and workstation design.
- The precision of these scanner-derived dimensions requires thorough investigation.
Purpose of the Study:
- To investigate the precision of 1D body dimensions derived from 3D whole body scans within the CAESAR survey.
- To compare the reproducibility of measurements obtained by different scanning teams and equipment combinations.
Main Methods:
- Two scanning teams (US and Dutch) used 3D whole body scanners to measure 20 subjects three times each.
- Subjects were marked with dots; linear distances between dots were calculated post-scan.
- Mean Absolute Difference (MAD) and Coefficient of Variation (CV) were computed and compared to US Army ANSUR survey standards.
Main Results:
- CAESAR scan-extracted measurements demonstrated high reproducibility, with most MAD values below 5mm.
- Over 93% of CAESAR MAD values were significantly smaller than acceptable errors reported in the ANSUR survey.
- Scan-extracted measurements showed precision comparable to or better than manual measurements.
Conclusions:
- The type of scan-extracted measurements used in the CAESAR survey are highly precise and reproducible.
- These measurements are as good as or superior to comparable manual measurements.
- Further studies are needed to assess the precision of scan-extracted measurements not using markers or straight-line distances.