(1) System calibration (basic calibration)

Confirm that the L-shaped calibration rod is placed in the center of the site, and other reflective marking points in the site are blocked or removed from the site;

You can observe all the cameras at the same time by clicking the "All on/All off" button at the bottom right of the XINGYING software interface, or click the bottom grid to observe only the specified camera; The number in parentheses in the lower left corner of each camera indicates the number of reflective markers that can be seen by the camera;

To confirm the stray points of each camera, the number in parentheses minus the number of actual reflective marking points in the scene (4 points on the L-shaped calibration rod) is the number of stray points;

The impurities in the site are removed, and the impurities that often occur are:

• Sunlight exposure;

• Metal table and chair shelves, ground reflective;

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

• Reflective markers scattered throughout the capture scene. There are usually three ways to remove clutter:

• Close curtains to block sunlight and remove reflective objects from the scene;

• Adjust the Threshold parameter in the lower left corner of the screen (usually between 200 and 600), but do not allow The points On the L rod cannot be seen and cannot be adjusted in the "All On" state;

• Use software for Mask processing.

Use the software for Mask processing manual mode: Select the camera with clutter to be processed, hold down the mouse wheel and drag it in the "2D View" interface, and the area with clutter in the frame will be masked. Automatic mode: Click "Automatic masking", then all points in the 2D view of the camera will be screened by the box, click "Delete all masking", then all points will be unmasked.(Figure 25);

Figure 25

Drag and drag several times until all the clutter in the box, so that the number in the lower left bracket is stable to 4;

The diameter range of "marker" in 2D view can be filtered in "maximum/minimum point diameter" at the bottom of the interface (see Figure 26).

Figure 26

If you want to delete a specific area in the box, use the left mouse button to select the area, and then click the right mouse button;

Keep the camera in real-time playback state, click the "Calibration" button at the bottom of the software interface to calibrate it, select the option of "basic calibration" in the pop-up window (as shown in Figure 27), and click "Next";

Figure 27

After confirming that the number in the brackets at the lower left corner of each camera in 2D view is stable at 4, click the "Next" button (as shown in Figure 28). If the calibration is passed, the window will become a T calibration window, and the "Next" button in the window is in a clickable state (as shown in Figure 29).If the L-calibration fails, the prompt "L Calibration Fild" will appear (Figure 30). The button "Next" will be gray and unclickable. Repeat the previous operation until the L-calibration is passed.

Figure 28

Figure 29

Figure 30

Move the L-calibrating rod out of the capture area to ensure that none of the cameras are visible, and move the T-calibrating rod(Figure 23) into the capture area;

In order to prevent interference with calibration, the swing person can first wave the T-shaped calibration stick in the field, and the other person can observe whether the number in the lower left bracket is greater than 3 in the 2D view. If so, it means that there are stray points in the field of view of the camera, and steps 5 and 6 can be repeated for processing;

Before calibration, the parameter "operation level" can be set in the "System" TAB in the setting window. The default value of "operation level" is 12. The larger the parameter setting of "operation level", the longer the calibration calculation time and the higher the calculation accuracy, while the smaller the parameter setting, the opposite is true.

In the pop-up window, "rod length" indicates the distance of reflective marker points at both ends of the T-rod used, and the number marked by the yellow label on the T-rod can be input. "Duration" is the calibration time, generally 60-120s. After setting, click "Next" button, and the swing personnel will hold the T-calibrating rod.Wave repeatedly in the capture area, and the corresponding area will turn gray when the camera collects effective data.Ensure that the effective data amount of each camera is sufficient, that is, the color of each camera changes from light to dark as the amount of data collected increases. (Figure 31);

Figure 31

Before T-calibrating, you can open the setting and check "Show calibration trajectory" in the "2D View" TAB (as shown in Figure 32). This function is not checked by default. Then, in the T-calibration process, the calibrated trajectory will be displayed in the 2D view, and the trajectory will be superimposed repeatedly when the swing time is repeated in an area (see Figure 33). When the set swing time is over, the calibrated trajectory on the superimposed 2D view will also disappear.

Figure 32

Figure 33

After the calibration time is up, click Next, the software will automatically calculate, and the calibration result will be displayed in the window after completion (such as: poor \ ordinary \ good \ very good, if the calibration result shows "poor" it is recommended to re-calibrate, the rest can be saved and used normally), click "Finish" button to complete the calibration (as shown in Figure 34);

Figure 34

Click the "File - Save calibration file" option at the lower right corner of the software interface to save the configuration file;

Click the option "View Type - 3D View" in the upper left corner of the software interface to make the software only display the 3D interface (as shown in Figure 35). The 3D interface can be rotated, translated, scaled and other effects by Ctrl/Shift and left/middle/right mouse button;At the same time, click the play button at the bottom of the interface to make the camera run in real time; In 3D view, hold down the left mouse button to drag the view to rotate the 3D view freely, click the right mouse button to bring up the function menu. Use of key combination: Hold down Shift+ left mouse button to select the named point when the frame is not frozen. Hold down the middle mouse button to drag the view, and scroll the middle mouse button to zoom in or out. Crtl+ Left mouse button to rotate the view in a fixed direction. The space bar restores the original 3D view with one key.

Figure 35