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1. Ensure Vicon Nexus is in Live mode. If it is not, in the Resources pane, click Go Live.

2. To visualize your capture volume, from the view pane menu, select Camera.

   

3. In the System Resources tree, select the node(s) for the camera(s) whose properties you wish to configure, either:
   
   • Vicon Cameras node for all Vicon cameras
     or
   • A sub node for a specific Vicon camera. The camera sub-nodes on the System tab correspond to the Names you set in the Properties pane (see below).
     Note that If no Lock is present in the Vicon system, the sub-node for the Vicon camera acting as the synchronization source is displayed in bold.
     When a camera is selected, a blue status light on its strobe unit lights up.
   Tip: In many cases, it is best to start by selecting all of the cameras, to find a common baseline. You can then adjust individual cameras as required.
4. In the capture volume, have someone wave the calibration wand and ensure that you can see marker images moving in the Camera view.

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5. In the Properties pane at the bottom of the System tab, click Show Advanced to show additional properties.
   When you first set up your Vicon system, configure the following camera properties in the order shown. (If you are not sure what a particular setting means, hover over the relevant field or control to display a tooltip.):
   Identification section: 
   • Name (If you wish to distinguish it from the other cameras)
   Settings section:
   
   • Strobe Intensity In most cases, keep its default setting (1).
   • Gain Only adjust this setting if the markers appear too faint or the cameras have trouble distinguishing them; otherwise, leave at its default setting (x1). Vicon does not recommend using a setting higher than x2.
   • Grayscale Mode This setting determines what data is sent from the camera to the computer. Ensure this is set to the default setting (Auto) for capturing data. If the camera recognizes a blob as a circle, only centroid data is sent. If the camera cannot distinguish the blob as a circle, full grayscale data is sent so that Nexus can attempt to circle-fit the blobs. Circle fitted markers are displayed as crosshairs in the Camera view.
   Centroid Fitting section:
   
   • Threshold This setting differentiates between markers and ambient light. A value in the region of 0.2 (the default) to 0.5 is usually appropriate, but Vicon strongly recommends that you view static markers in the volume to establish an appropriate setting. If cameras are evenly spaced around the volume, the same Threshold value is usually sufficient for all cameras.
   • Minimum Circularity Ratio The circularity threshold used by the centroid-fitting algorithms in a Vicon camera to fit centroids to grayscale blobs. The higher the value, the more stringent the centroid fitter is. For camera calibration, you may wish to apply higher settings to ensure that the Vicon system selects the best markers and thus provides the best possible calibration. For data capture, a lower value may be appropriate. When a blob is fitted with a centroid, it is represented by crosshairs. The default setting is 0.5.
   Tip

   Tip

   
   

   : If adjusting these settings does not easily enable you to eliminate reflections, create camera masks to eliminate reflections and other unwanted light sources that occur in parts of the capture volume. For information on masking, see Mask unwanted reflections.

   Centroid Tracking section:
   • Enable Centroid Tracking Tracking 2D camera centroids provides extra information that maintains marker labels in real time when only one camera can see a marker. When enabled, the 2D track calculations are performed by a camera's onboard sensors. When disabled, the 2D track calculation is performed by the PC (in Nexus). The default is off. 
   • Marker Velocity Maximum velocity at which a marker will be tracked, expressed as the percentage of image width per second. The default is 5.
6. When you have finished adjusting the Vicon Cameras settings, in the Settings section, ensure that Grayscale Mode is set to Auto.

7. At the top of the System tab, click the Save button to save your system configuration settings to a .system file in the Systems Configurations folder (see Manage configurations in Vicon Nexus).

   

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