Perform a wand wave

During camera calibration, after you have masked any reflections, you calibrate the cameras by waving a wand (the calibration device) throughout the volume to enable the cameras to capture movements over the whole area.

To perform a wand wave:

1. Ensure you have completed the steps in Mask cameras.
2. In the volume, ensure the Wand is in Continuous mode.

3. In Evoke, click Wave All.

   The button displays Stop and the menu bar changes color and displays the text Camera Calibration Active.

4. Have someone wave the wand throughout the capture volume, covering depth as well as height, while you watch the Cameras views for all cameras to ensure you get full coverage. Ensure that the markers (LEDs) on the wand remain visible to all the cameras as much as possible while the wand is moved throughout the volume.

   As an indication of the age of the wand detection, to help you see where the wand is being waved and getting detections, the display in the each view changes from orange to blue.

   

   In the Camera Calibration panel, notice that the Wand Count column changes from red to green as sufficient data per camera is captured. This helps you concentrate on waving the wand for cameras that need more data.

   Tip: By default, camera calibration stops automatically when each camera has seen enough of the wand to ensure calibration. To adjust this or turn it off, in the Camera Calibration panel, under Wand Wave, ensure advanced parameters are displayed . To adjust the amount of data needed before the camera calibration stops, change the value of Auto Stop Minimum Frames. To turn off the automatic stop, clear the Auto Stop check box. If you do this, the Wand Count column does not change color, and you must estimate when enough data has been captured.

5. After the wand wave has stopped, the Image Error column displays the values and grades the status of each camera from red (poor) to green (excellent), depending on how well the camera connects the centroids to the wand markers.

   

   In the volume, the status lights on the Viper cameras turn magenta and blink during calibration, becoming green and then blue when fully calibrated.

After the wand wave, the cameras are calibrated relative to each other but the volume origin has not been set. You do this in the next step (see Set up the volume).