1. Preparing for Calibration

1. First, connect the camera and place the software in playback mode. Switch to 2D view, confirm that the L-shaped calibration rod is in the center of the field, and block or remove other reflective markers within the field.

2. Click the "Show all cameras" button above the 2D view to observe all shots simultaneously, or double-click each shot in the 2D view to observe only the specified shots. The number in parentheses at the bottom left corner of each camera represents the number of reflective marker points that the camera can detect, ensuring that only the four reflective marker points on the L-shaped pole are visible in the 2D view of each camera.

3. Verify the presence of clutter in each camera's view by subtracting the number in parentheses from the actual number of reflective marker points in the scene (4 points on the L-shaped calibration pole) to obtain the number of clutter points.

4. Remove extraneous points from the site, which often occur due to:

   • Bright sunlight;

   • Reflective surfaces on metal tables, chairs, shelves, and flooring

   • Reflective stickers/logos, jewelry on clothing, shoes, and hats

   • Stray reflective markers scattered in the captured scene.

5. Common methods for removing clutter:

   • Close the curtains to block out sunlight

   • Remove reflective objects from the scene

   • Adjust the camera's aperture

   • Adjust the device's threshold parameters in the software's 2D view (usually between 200 and 600)

   • Adjust the camera's brightness in the software's 2D view

   • Use software for mask processing.

6. The maximum and minimum values can be set in the "Minimum Point Diameter/Maximum Point Diameter" section below the device panel to filter the diameter range of the "marker" in the 2D view.

7. Mask Processing

   • Manual Mode: Double-click the cameras to be processed in the 2D view to zoom in on a single screen. Press and hold the mouse wheel in the 2D view to drag and drop, frame the area with impurities, and the impurities will be removed. You can repeatedly select boxes until all the miscellaneous points in the view are removed.

   • Automatic Mode: Click the automatic masking button in the toolbar above the 2D view, and all 2D points in the view will be masked. Click "Clear Mask" to delete all masks. Using "Clear Mask" in a single view will only clear the mask in the current view (as shown in the figure). When selecting an automatic mask, it is necessary to clear useful and real reflective markers within the venue.

   • To delete a specific area in the mask box caused by incorrect operation, click the left mouse button to select the area, and then click the right mouse button.

     

     8.1.1
8. After the above operations are completed, the calibration personnel should hold the T-shaped calibration rod and swing it in the field. Another person can observe whether there is a number greater than 3 in the bracket at the bottom left corner of the 2D view. If so, it indicates that there are impurities in the camera's field of view. Steps 5 and 7 can be repeated for processing until the cameras reach the optimal calibration state.