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2. Basic Calibration

  1. Keep the camera in Live playback mode, click the "Calibration" button in the toolbar above the software to open the calibration panel, and select "Initial Calibration" in the calibration window. Click on the gear button on the right to open the calibration settings, select the calibration axis (Z/Y) in the "Frame, " select the L calibration rod you are using (L-600/L-450/L-240) in the "L-Type, " and "Manual" for the custom L-shaped rod type.
  2. Next, perform L calibration by placing the L-shaped rod, selected in step 1, in the center of the field. Confirm the coordinate orientation: when the Z-axis is upward, the long side of the L-rod points in the positive X-axis direction, and the short side points in the positive Y-axis direction. When the Y-axis is upward, the long side points in the positive Z-axis direction, and the short side points in the positive X-axis direction. Before performing L calibration, ensure that the number in the bottom left parentheses of all 2D views is stable at 4. Click "L Calibration" at the bottom of the panel. If L calibration is successful, the window will become a T calibration window, and the "Next" button will be clickable. If L calibration fails, a prompt "L Calibration Field" will appear, and the "Next" button will be gray and non-clickable, possibly due to the presence of extraneous points in the calibration site. Repeat the impurity removal operation until L calibration is successful.
  3. L calibration results can be divided into three categories:
    • All Passed: All lenses pass calibration, and the calibration result graph displays in green.
  • Partial Pass: More than 1/8 of the lenses pass calibration, with a minimum of 2 lenses. The calibration result graph displays in yellow.
  • L Calibration Failure: The calibration result graph displays in red.
  • T calibration can only proceed when all lenses pass or partially pass the L calibration; otherwise, continue L calibration until successful.
  1. After passing the L calibration, move the L-shaped calibration rod out of the capture area to ensure no camera can observe it. Then, bring the T-shaped calibration rod into the capture area.
  2. Perform T calibration. In the basic T calibration window, "pole length" represents the distance between the reflective marker points at both ends of the T-shaped pole. Enter the number marked on the label on the T-shaped pole. "Duration" represents the calibration time, usually 60-120 seconds. After setting up, click the "Next" button. The personnel hold the T-shaped calibration rod and repeatedly swing it within the capture area. If the camera collects valid data, the corresponding area will turn gray, ensuring that the amount of effective data from each camera is sufficient. As the collected data amount increases, the color of each camera will change from light to dark (8.2.1);\
  1. A progress bar is displayed during the T calibration, which gradually moves forward with the swing time. When the progress bar reaches 50%, the background color of the T calibration will change from orange-yellow to green. Wave the T-bar to cover every corner visible to the camera as much as possible. In the 2D view of all cameras, at most three markers of the T-shaped bar should be seen (i.e., the number in the bottom left corner of the 2D view of all cameras should be less than or equal to 3; try to make as many camera numbers as possible equal to 3). During the calibration process, the 2D interface displays the area scanned by the calibration bar, showing the available data amount and impurities in real-time. When the dialog box displays the predetermined frame number, i.e., when the progress bar reaches 100%, a calculation button appears below the floating window. Click "Calculate" and the software enters the calculation process. After the calculation is completed, the software will provide feedback on the calibration results, evaluated as poor, normal, good, or very good. Different icons will also be displayed on the right side of the T calibration based on the calibration results. (If the calibration result shows "poor, " it is recommended to recalibrate; otherwise, it can be saved and used normally.) Click "Save Calibration File" to save the file and then click "Finish".
  2. During the T calibration swinging process, you can click the 'Terminate' button at any time to stop the swinging. After stopping, you can click 'T Calibration' again to restart the swinging process. If you are not satisfied with the swinging data after completion, you can click the 'Previous' button to return to the state before the T calibration swinging started and restart the swinging operation.
  1. During the calculation process, you can click the 'Terminate' button at any time to stop the calculation. If the calculation result is poor or average, you can click the 'Previous Step' button to return to the page before calculation and recalculate the result. Alternatively, you can click the 'Previous' button twice to return to the state before the T calibration swinging started and redo the swinging.
  2. Click on "3D Data View" in the toolbar to display the 3D view (8.2.2). This 3D interface can be rotated, panned, and zoomed in using Ctrl/Shift in conjunction with the left/middle/right mouse buttons. Click the play button at the bottom of the interface to put the camera in Live operation mode. In the 3D view, holding down the left mouse button and dragging allows for free rotation of the 3D view. Clicking the right mouse button brings up the function menu. Use of key combinations: Hold down Shift + left mouse button in a non-frozen frame state to select a named point. Hold down the middle mouse button to drag the view, and scroll the middle mouse button to zoom in or out. Ctrl + left mouse button can rotate the view in a fixed direction. The space bar restores the original 3D perspective with one click.