Each broadcast camera in your studio that is tracked needs to be fitted with a tracking object.
Due to the differing designs of cameras, these objects may be mounted in a different way on each camera.
The calibration process determines the position of the object relative to the optical axis of the lens and the sensor plane, so that the positional information transmitted in the data stream is correct.
Select the correct camera and object
Start the Vicon Studio software and select the correct camera object from the drop down list box, then click Next.
If the selected camera has been calibrated, choose Recalibrate the camera or Review the calibration as necessary and then click Next.
Connect to the Tracker software
The Studio software automatically attempts to connect to the tracking system software and checks timecode is present and correct. When this has been confirmed, click Next.
Capture wand wave
Vicon Studio then checks connection to the broadcast camera and checks for synchronization to the tracking system.
Adjust the aperture and shutter speed of the camera to obtain an image with a black background where a good view of the markers on the Active Wand can be seen when it is moved in front of the camera. When the blobs are circular enough (without significant flaring or starburst) and large enough, Vicon Studio overlays detected markers with translucent green circles on the video preview in real time to help you to determine whether the image settings are good.
When you are happy with the camera settings, click Record and wave the Active Wand throughout the camera view while keeping the wand in view of the tracking cameras.
To set the video preview window to full screen, press F5.
To start and stop recording, press Ctrl+<space bar>.
When a good proportion of the field of view is covered by detected wand frames (colored lines), click Stop.
If necessary, return from fullscreen view, and then click Next.
Studio automatically processes the camera calibration. Processing is complete when the progress bar reaches 100%.
When finished, click Next.
Vicon Studio has now calibrated the camera and lens but needs to offset the origin of the lens to a point within the sensor plane.
This is done either using actual measurements from the camera and lens, or by using a Vicon retroreflective marker that is placed in the sensor plane (on the plimsoll mark on the camera body). When the marker is placed in the correct location, click Recalculate.
After a few seconds, Studio reports a value for the Distance from focal place to CCD plane. Click Next.
When this stage is reached, Studio updates the Tracker software with the correctly calibrated camera object.
This page includes some basic test features in order to ascertain whether the calibration is correct:
- A wireframe cube is overlaid on the video preview window at the origin of the tracking system such that when the camera is panned or tilted, the cube appears to remain stationary. Compare the position of the cube with a piece of paper placed on the floor.
- Unlabeled 3D retroreflective markers are reprojected onto the video preview and their coincidence with the same markers visible in the video camera field of view can be confirmed.
Click Finish to exit the Studio camera calibration wizard and leave the tracking system ready for production use, or click restart to calibrate another camera.