2015-06-30

The aim of this study was to develop an automatic orientation calibration and reproduction method for recording the natural head position (NHP) in stereo-photogrammetry (SP). A board was used as the physical reference carrier for true verticals and NHP alignment mirror orientation. Orientation axes were detected and saved from the digital mesh model of the board. They were used for correcting the pitch, roll and yaw angles of the subsequent captures of patients’ facial surfaces, which were obtained without any markings or sensors attached onto the patient. We tested the proposed method on two commercial active (3dMD) and passive (DI3D) SP devices. The reliability of the pitch, roll and yaw for the board placement were within ±0.039904°, ±0.081623°, and ±0.062320°; where standard deviations were 0.020234°, 0.045645° and 0.027211° respectively. Conclusion: Orientation-calibrated stereo-photogrammetry is the most accurate method (angulation deviation within ±0.1°) reported for complete NHP recording with insignificant clinical error.

Hsung, TC, Lo, J, Li, TS, Cheung, LK. (2015). Data from: Automatic Detection and Reproduction of Natural Head Position in Stereo-Photogrammetry. [Data File]. All relevant data are within the paper and its Supporting Information files. Click on “Linked Publications” to access the publication and access supporting information on figshare at https://figshare.com/articles/_Automatic_Detection_and_Reproduction_of_Natural_Head_Position_in_Stereo_Photogrammetry_/1468933

pitch

mesh model

orientation calibration

head position

Natural Head Position

angulation deviation

yaw angles

Automatic Detection

NHP recording

reproduction method

DI 3D SP devices

reference carrier

Orientation axes

board placement

NHP alignment mirror orientation