Difference between revisions of "Calibration Squares"

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During [[Calibration]] process, a calibration square is used to define global coordinate axes as well as the ground plane for the capture volume.
  
'''THIS PAGE IS UNDER CONSTRUCTION'''  '''THIS PAGE IS UNDER CONSTRUCTION'''  '''THIS PAGE IS UNDER CONSTRUCTION'''  '''THIS PAGE IS UNDER CONSTRUCTION''' }}
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==Calibration Square Types and Conventions==
  
[[OptiTrack Documentation Wiki|Back to the Main Page]]
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----
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==Custom Calibration Square==
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{|class="wikitable" style = "margin: auto; width: 60%;"
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|+Calibration Squares
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!Square Type
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!Descriptions
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|-
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|[[Image:calibrationSquareCS100.jpg|200 px]]
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|CS-100: Used to define a ground plane in a small, precise motion capture volumes.
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* Long arm: Positive z
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* Short arm: Positive x
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* Vertical offset: 11.5 mm
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|-
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|[[Image:calibrationSquareCS200.jpg|200 px]]
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|CS-200:
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* Long arm: Positive z
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* Short arm: Positive x
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* Vertical offset: 19 mm
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|-
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|[[Image:Calib_Square.jpg|200 px]]
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|CS-400: Used for general for common mocap applications. Contains knobs for adjusting balance as well as slots for aligning with a force plate.
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* Long arm: Positive z
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* Short arm: Positive x
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* Vertical offset: 45 mm
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|-
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|[[File:Motive1.7Ori.png|200 px]]
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|Legacy L-frame square: Legacy calibration square designed before changing to the Right-hand coordinate system.
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* Long arm: Positive z
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* Short arm: Negative x
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|}
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==Coordinate System==
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For Motive 1.7 or higher, Right-Handed Coordinate System is used as the standard, across internal and exported formats and data streams. As a result, Motive 1.7 now interprets the L-Frame differently than previous releases:
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<table cellspacing="0" cellpadding="0" style="margin:auto;  width:60%">
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<tr>
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<td style = "width: 50%;padding-top: 0em;">
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'''Motive 1.6 and earlier'''
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L-Frame long (marked Z) "leg" interpreted as -Z, L-Frame short (unlabeled) leg interpreted as +X
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</td>
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<td style = "width: 50%;padding-top: 0em;">
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'''Motive 1.7+'''
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 +
L-Frame long (marked Z) "leg" interpreted as +Z, L-Frame short (unlabeled) leg interpreted as -X
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</td>
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</tr>
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<tr>
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<td style = "width: 50%; padding-top: 0em;">
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<center>[[File:Motive1.6Ori.png|frame|left|Motive 1.6 L-Frame]]</center>
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</td>
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<td style = "width: 50%; padding-top: 0em;">
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<center>[[File:Motive1.7Ori.png|frame|left|Motive 1.7 L-Frame]]</center>
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</td>
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</tr>
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</table>
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 +
 
 +
The simplest method to account for this change is to '''rotate the L-Frame 180° during calibration''' (rotating "around the Y axis"). If the L-Frame is not rotated during calibration, Motive will display inverted global coordinates when comparing the same data in Motive 1.7 and Motive 1.6 and earlier:
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<center>[[File:Motive1.7Coordinate-LFrameImplications.png|400px]]    [[File:Motive1.6Coordinate-LFrameImplications.png|400px]]</center>

Revision as of 01:25, 7 November 2015

During Calibration process, a calibration square is used to define global coordinate axes as well as the ground plane for the capture volume.

Calibration Square Types and Conventions

Custom Calibration Square

Calibration Squares
Square Type Descriptions
CalibrationSquareCS100.jpg CS-100: Used to define a ground plane in a small, precise motion capture volumes.
  • Long arm: Positive z
  • Short arm: Positive x
  • Vertical offset: 11.5 mm
CalibrationSquareCS200.jpg CS-200:
  • Long arm: Positive z
  • Short arm: Positive x
  • Vertical offset: 19 mm
Calib Square.jpg CS-400: Used for general for common mocap applications. Contains knobs for adjusting balance as well as slots for aligning with a force plate.
  • Long arm: Positive z
  • Short arm: Positive x
  • Vertical offset: 45 mm
Motive1.7Ori.png Legacy L-frame square: Legacy calibration square designed before changing to the Right-hand coordinate system.
  • Long arm: Positive z
  • Short arm: Negative x


Coordinate System

For Motive 1.7 or higher, Right-Handed Coordinate System is used as the standard, across internal and exported formats and data streams. As a result, Motive 1.7 now interprets the L-Frame differently than previous releases:

Motive 1.6 and earlier

L-Frame long (marked Z) "leg" interpreted as -Z, L-Frame short (unlabeled) leg interpreted as +X

Motive 1.7+

L-Frame long (marked Z) "leg" interpreted as +Z, L-Frame short (unlabeled) leg interpreted as -X

Motive 1.6 L-Frame
Motive 1.7 L-Frame


The simplest method to account for this change is to rotate the L-Frame 180° during calibration (rotating "around the Y axis"). If the L-Frame is not rotated during calibration, Motive will display inverted global coordinates when comparing the same data in Motive 1.7 and Motive 1.6 and earlier:

Motive1.7Coordinate-LFrameImplications.png Motive1.6Coordinate-LFrameImplications.png