This document provides guidelines for capturing high quality clinical video of patients walking. It discusses keeping the video bright with good lighting, big by having the patient fill the frame using appropriate camera distance and zoom, straight by positioning the camera for pure sagittal or coronal views, and steady by using a tripod. It recommends a room size that allows 8-10 strides of walking and is visible to the camera, with minimal clothing and background contrast for clinical protocols.

1. Clinical Video
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2. Basic principles
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3. Basic principles
• Keep it bright
• Keep it big
• Keep it straight
• Keep it steady
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4. Keep it bright
• Good light
• Big lens/big sensor
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5. Good light
• Modern gait analysis systems can cope
with high light levels.
• Natural light
• Flourescent light
• Special lights (halogen bulbs)
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6. Good camera
£250 £1,900
3 x lens size
15 x Sensor
4 x Resolution
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Test at correct shutter speed (1/125th second)

7. Keep it big
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8. Keep it big
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9. Keep it big
• Combination of camera distance and
zoom setting.
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10. Keep it straight
• Pure sagittal view
• Pure coronal view
• All determined by camera position
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11. Parallax
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1.5m
5m
17°
Direction of walking

12. Parallax
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1.5m
5m
8m
17° 11°
Direction of walking

13. Parallax
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Distance form
camera (metres)
Parallax at 1.5m
from centre of field
of view
3 27°
4 21°
5 17°
6 14°
8 11°
10 9°
12 7°

14. Parallax
• Move back as far as possible (5-8m)
• Zoom in so patient fills field of view
• Ensure adequate lighting (the further back
the camera is the more light will be
required
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15. Keep it steady
£30
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16. Setting up the room
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17. Minimal room size
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8m
5m
Walkway long enough for 8 to 10 strides (8m)

18. Minimal room size
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8m
5m
Visible to camera (keep clean)
Dead
space
Dead
space

19. Simultaneous with 3DGA
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8m
5m

20. Special effects
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21. Panning
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22. Zooming
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23. Split-screen
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24. Special effects
Positive
• Look good
• Cover more walking
• Capture turning
• Use video screen
efficiently
Negative
• Parallax effects
• Technically more
challenging
• Requires additional
person
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25. Clinical protocols
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26. Clinical protocols
• The more of the patient you can see the
more useful the video will be.
• Minimal clothing
• Good contrast in background and floor
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27. Conditions
Once in bare-feet with minimal walking aids
for reasonable walking (capacity)
Once in normal footwear, splints and walking
aids (performance)
Other combinations that might be clinically
meaningful.
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28. Views
• Split screen
• Full sagittal
• Close up sagittal
• Full coronal
• Close up coronal
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