Preparation for calibration
Firstly, connect the camera to place the software in playback mode, switch to 2D view, confirm that the L-shaped calibration rod has been placed in the center of the field, and block or remove other reflective markers within the field；
You can click the "Show all cameras" button above the 2D view and observe all shots at the same time, or double-click each shot in the 2D view to only observe the specified shots; The number in parentheses at the bottom left corner of each cameras represents the number of reflective marker points that the cameras can see, ensuring that only the four reflective marker points on the L-shaped pole are visible in the 2D view of each cameras；
Confirm the clutter of each camera, subtract 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；
Remove miscellaneous points from the site, which often occur：
Sunniness；
Metal tables, chairs, shelves, and reflective flooring；
Reflective stickers/logos, jewelry on clothing, shoes, and hats；
Scattered reflective markers in the captured scene.
The following are methods for removing impurities：
Pull up the curtains to block out the sunlight；
Remove reflective objects from the scene;
Adjust the aperture of the camera;
Adjust the threshold parameters of the device in the 2D view of the software (usually between 200 and 600);
Adjust the brightness of the cameras in the 2D view of the software;
Using software for mask processing;
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
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 shielded. You can repeatedly select boxes multiple times until all the miscellaneous points in the view in the box are removed
Automatic mode: Click the automatic masking button in the toolbar above the 2D view, and all 2D points in the 2D view will be masked. Click Clear Mask, and all masks will be deleted. 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；
After the above operations are completed, the calibration personnel can first 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 field of view of the cameras. Steps 5 and 6 can be repeated for processing until the cameras reaches the optimal calibration state.
For incorrect box selection caused by incorrect operation, if you want to delete a specific area in the box, click with the left mouse button to select the area, turn red, and then click with the right mouse button;
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