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Frequently Asked Questions

1. Why can't I find a camera?​

Check whether the group or status filters in the camera list are limiting the results. Select All to display every camera.

2. Why is a camera feed missing on the Video Processing page?​

The page lists calibrated cameras only, and all cameras are hidden by default when the page opens. Confirm that the camera is calibrated, selected in the group tree, explicitly shown, and that a global 3D model scene has been saved.

3. Why can't fixed-camera distortion correction be calculated?​

Add at least one valid straight line with more than five points. Use clear straight edges such as road markings, building outlines, or walls. Lines distributed across the image usually produce more stable results.

4. Why does intrinsic-parameter calculation fail?​

The selected rectangle may not have enough perspective. Choose a rectangle where two sets of parallel lines visibly converge in a V-shaped perspective. If it still fails, capture a new image, select the points again, and verify their order.

5. Why can't I select an extrinsic-parameter point?​

First select an image point, then select the matching point with the same name in the 3D model scene. Finish the current point pair before selecting another image point.

6. Why are fixed-camera extrinsic parameters inaccurate?​

Use reference points at different heights and directions with an even spatial distribution. Points concentrated in one plane or area can reduce accuracy.

7. Why are no fisheye cameras available for parameter reuse?​

Only calibrated fisheye cameras can be reused. Calibrate at least one fisheye camera first, or recalculate distortion parameters with chessboard calibration.

8. Why does chessboard screenshot recognition fail?​

Use at least 15 clear, complete chessboard screenshots from different positions and angles. Avoid dark or overexposed boards, boards only in the image center, occluded edges, and nearly identical viewing angles.

9. Does deleting a group delete its cameras?​

No. Cameras in the deleted group are retained and moved to Ungrouped.

10. Does changing the scene configuration affect calibration?​

The system uses one global 3D model scene for fixed-camera calibration, fisheye calibration, and video processing. Reconfiguring or clearing it can affect later results; back up existing settings first if needed.