Masking Infrared Interference for Calibration

Masking is a function in Motive where an area of the BTSensor’s vision is masked (blocked from view). This tells the system to ignore the masked section when looking for infrared sources. This is used primarily to mask outside infrared interference that can confuse the system during BTSensor calibration.

Excessive masking may limit a BTSensor field of view, as a masked area makes a BTSensor blind to tracking in that area. You can reposition BTSensors to improve fields of view, rather than masking in extreme cases of infrared interference.

Attention: Calibration will be successful if you mask infrared interference before calibration. Masking differs if Motive is configured for active or passive markers.

To automatically mask all visible infrared sources from all BTSensors

Attention: Automatic masking will remove all previous masks from the BTSensor.

  1. In Motive, go to the Camera Preview window.
  2. On the Camera Preview toolbar, click the Mask Visible Markers button.
    • MaskVisibleMarkers Icon The Mask Visible Markers button.
    • Result: All currently visible infrared sources are masked. Any previously created masks are removed. If additional sections need to be masked, use manual masking techniques.

To clear all masks from all BTSensors

  1. In Motive, go to the Camera Preview window.
  2. On the Camera Preview toolbar, click the Clear Masking button.
    •   ClearMasking Icon The Clear Masking button.
    • Result: All masking are cleared from all BTSensors.

To manually mask a BTSensor view

  1. In Motive, go to the Camera Preview window.
    • Result: What each connected BTSensor sees is displayed as a 2D image in the Camera View window. If BTSensors are configured to see infrared sources, they appear as white objects. 
    •   Camera Preview IR  Camera View window with infrared interference.
  2. On the Camera Preview toolbar, select the shape of the mask, either Draw Rectangular Mask or Draw Circular Mask from the toolbar.
    • DrawRectangularMask Icon The Draw Rectangular Mask button.
    • Result: You will create masks in the selected shape.
    •   Rectangular Mask Camera View window with rectangular mask.
  3. To mask the infrared interference areas inside the Camera View window of a BTSensor, click on one corner of the interference while holding the left mouse button down and drag the mask to cover the infrared interference.
    • Result: The infrared object (white object) is covered by a mask (red object). The infrared source will not interfere with tracking when masked.
    •   Masked IR Partial   Camera View window with partial IR masking.
  4. Repeat the above steps for each instance of infrared interference.
    • Masked IR Full    Camera View window with full IR masking.

To toggle additive or subtractive masking

The Toggle Additive/Subtractive Masking button makes all the draw masking buttons remove the masking instead. For example, if you click the Toggle Additive/Subtractive Masking button to subtractive and then draw a rectangle, the individual masking where the rectangle was drawn will be removed.

  1. In Motive, go to the Camera Preview window.
  2. On the Camera Preview toolbar, click the Toggle Additive/Subtractive Masking button.
    • ToggleAdditiveSubtractiveMasking  The Toggle Additive/Subtractive Masking button.
    • Result: Toggle subtractive makes all draw masking buttons remove the masking when applied. Toggle additive makes all draw masking buttons add the masking when applied.
  3. Draw the mask.
    • Result: The mask is removed if toggle subtractive is selected. The mask is added if toggle additive is selected.