Three-camera setup to record simultaneously standardized high-definition video for smile analysis
Volume 152, Issue 5, November 2017, Pages 711–716
Introduction
Our
objective was to develop a photographic setup that would simultaneously
capture subjects' smiles from 3 views, both statically and dynamically,
and develop a software to crop the produced video clip and slice the
frames to study the smile at different stages.
Methods
Facial
images were made of 96 subjects, aged 18 to 28 years, in natural head
position using a standardized setup of 3 digital single lens reflex
cameras, with a reference sticker (10 × 10 mm) on the forehead of each
subject. To test the reproducibility of the setup, 1 operator took 3
images of all subjects on the same day and on 3 different days in a
subset of 26 subjects.
Results
For
the same-day observations, correlation coefficients varied between 0.87
and 0.93. For the observations on 3 different days, correlation
coefficients were also high. The duplicate measurement error and the
mean difference between measurements were small and not significant,
pointing to good reliability.
Conclusions
This
new technique to capture standardized high-definition video and still
images simultaneously from 3 positions is a reliable and practical tool.
The technique is easy to learn and implement in the orthodontic office.
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