All recommendations and requirements listed for Using a Head Mount still apply, with a few additional notes and a slightly different appearance specific to stereo pairs.
Performer Framing
Optimal framing has the center of the image aligned with the upper part of the philtrum (base of nostrils).
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Optimal Framing — lower camera | Optimal Framing — upper camera |
Below are several examples of poor image framing.
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Too low | Too low | Too high | Too high | Off axis |
Stability
With a head mount, the performer has freedom to move around the volume. The camera must be stable relative to the face throughout a recording. This requires a well-fitted head mount.
Below is an example of excessive camera motion that could impact on the quality of the results.
Excessive camera motion
Focus
The lenses should be focused on the nasolabial area of the face (cheek surface to the side of the nostrils). Depending on the depth of field, it might not be possible to have all parts of the face in perfect focus.
The following image shows an out of focus example.
Lighting (Visible On-Board Lights)
When using a HMC, both ambient and on-board lighting should be considered. Optimal lighting will have the face evenly lit, minimal shadows, and no patches of over exposure.
Below is a set of examples for sub-optimal lighting that can cause quality issues in the output animation data.
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Over exposed | Under exposed | Side lit | Room lights visible | Shadows |
Environment
The ideal environment will have a flat background that contrasts with the performer’s skin color. No objects should block the performer’s head.
No objects should block the performer’s head.