---
title: "Activate Video Calibration"
canonical: "https://help.vicon.com/space/ShogunMarkerless121/1253507151/Activate%20Video%20Calibration"
format: markdown
---
The first stage in calibrating your Vicon Markerless system is to ensure the markerless cameras can identify the Active Wand required for the calibration. 

**To begin calibrating markerless cameras:**

1. In the **Camera Calibration** panel, click **Activate Video Calibration**.
  The button changes color and displays **Deactivate Video Calibration**.  
The video images darken to enable the cameras to clearly see the wand LEDs for a high quality calibration.
2. To display centroids in the **Cameras** view, click **View Filters** and under **2D Data**, ensure **Centroids** is selected.
3. Observe the image in the **Cameras** view for each markerless camera.  
If too much light is preventing successful wand tracking:
  1. In the **System** panel, ensure the affected camera(s) is selected.
  2. In the camera's **Properties**, under **Video Calibration**, adjust the **Shutter Duration**.