Digital 2D-photogrammetry and direct anthropometry--a comparing study on test accomplishment and measurement data

Area of Science:

• Anthropometry
• Biometrics
• Medical Imaging

Background:

• Reliable head and face measurements are increasingly important.
• Direct anthropometry and digital 2D photogrammetry are common methods.
• Comparing these methods is crucial for accurate biometric data.

Purpose of the Study:

• To compare direct anthropometry and digital 2D photogrammetry for kephalofacial measurements.
• To assess the reliability and differences between the two measurement techniques.

Main Methods:

• Methodological anthropometric study involving 45 subjects (18 male, 27 female) aged 24-65.
• Direct anthropometry and digital 2D photogrammetry were used to measure 27 facial landmarks and 26 kephalofacial distances.
• Comparison of measurements obtained from both techniques.

Main Results:

• Kephalofacial distances were on average 7.6% shorter with direct anthropometry.
• Significant differences observed in total head height, sellion-gnathion, and nasal-gnathion distances.
• Forehead width was significantly narrower with 2D photogrammetry (-1.4 cm, -13.1%).
• Small differences (<0.5 cm) found for mucosa-lip-height, gonia, glabella-stomion, and nose height.

Conclusions:

• Both direct anthropometry and 2D photogrammetry are similarly valid for kephalofacial measurements.
• Methodological differences increase with the magnitude of the measured distance.
• The techniques may be used interchangeably, with awareness of their limitations.