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Camera Placement

Table of contents
  1. “HMD” mode (above, facing screen)
  2. “Desktop” mode (bottom-up and below, facing user)
  3. Coming soon: Screentop mode (above, facing user)
  4. Guidelines
  5. Note: Diagrams based on screens having 16:9 aspect ratio

To confirm hand tracking is optimal for your chosen Camera placement, please ensure you check out the Testing Hand Tracking section.

The following Ultraleap camera module placements are supported in this TouchFree release.

“HMD” mode (above, facing screen)

TouchFree HMD camera placement

  • The Ultraleap camera module should be at least 10cm away from the highest point where the hand enters.
  • The camera tilt should be between 15° to 85° from the horizontal.

“Desktop” mode (bottom-up and below, facing user)

TouchFree Desktop camera placement

  • The Ultraleap camera module should be at least 10cm below the lowest point on the screen that users will interact with.
  • The camera tilt should be no more than 20° from the horizontal.
  • Ensure that the camera is a minimum of 1cm away from the screen.

Coming soon: Screentop mode (above, facing user)

Ultraleap will support a new Screentop mode camera placement in future software updates.

TouchFree Screentop camera placement


Guidelines

Ensure that the user interface is contained within the camera module’s field of view. When choosing and positioning your Ultraleap camera module, consider the best position and/or making sure that UI elements are well within the field of view.

  Leap Motion Controller Stereo IR 170 Camera Module
Interaction zone depth Between 10cm to 60cm preferred, up to 80cm maximum Between 10cm to 75cm preferred, up to 1 m maximum
Field of view 140×120° typical field of view 170×170° typical field of view

Leap Motion Controller Stereo IR 170
Leap Motion Controller Stereo IR 170
TouchFree camera placement FoV TouchFree camera placement FoV
22” screen / UI 29” screen / UI
TouchFree camera placement FoV TouchFree camera placement FoV
27” screen / UI 40” screen / UI

Note: Diagrams based on screens having 16:9 aspect ratio

Ensure that there are minimal infrared (IR) sources and reflections within the field-of-view of the camera. These can reduce the quality of hand tracking.

Digital screens can act as mirrors, creating IR glare from the camera module’s own LEDs. To avoid this, place the camera outside the screen’s projection plane if possible.

Operating your Ultraleap camera in bright sunlight may also impact performance. To improve performance, consider a camera placement like “HMD” mode, or moving it to a less bright/reflective environment.

TouchFree IR sources

IR sources and reflections can be seen in the Visualizer.

TouchFree Camera Projection Plane

Camera should be placed outside of the screen’s projection plane. Try to maintain this even when screen is tilted.

TouchFree Object in Camera FoV

You should also ensure that there are no obstructions within the field of view of the camera and that the background is as simple as possible.

TouchFree Hands not Tracked

The Visualizer can be used to check for obstructions. In this example, hands are not tracked even though they are in the centre of the camera module’s field of view.