Issue description
Occasionally, thin structures look wavy in my panoramas.
When panoramas are created, they are rendered from a virtual viewpoint at the center of the head that lies between all cameras. The cameras must then be moved virtually to the center. Due to parallax (https://en.wikipedia.org/wiki/Parallax), moving the cameras causes objects in the foreground to move more than objects in the background. If there's a strong discontinuity in depth between foreground and background, moving the foreground and background "correctly" would create holes in the panorama. So the algorithm has to decide how far to move individual parts of the image, which can bend some objects. This happens especially if the foreground structures are thin and close to the camera.
Troubleshooting Procedure
Hide poor looking panoramas in Post-Processing
Some of the wavy structures, especially ones in the upper or bottom third of the panorama are less obvious. If faulty structures appear in the middle third of the panorama, you can hide this panorama location in NavVis IVION.
General guidelines for good panoramas
Make sure that everything visible in the panoramas was also scanned with the laser scanners, otherwise depth information will inaccurate.
Do not get too close to individual objects, keep a distance of at least 1m.
Calibrate the device. If the stitching artifact appears in every panorama at the same location, this might be caused by an incorrect calibration.
FAQ
What causes thin structures to appear wavy in panoramas?
Thin structures may look wavy due to parallax effects when the cameras are virtually moved to create the panorama. This can cause foreground objects to move differently than background objects, leading to distortions.
How can I hide poor-looking panoramas in NavVis IVION?
You can hide panoramas that have faulty structures, especially those in the middle third, by using the hiding feature in NavVis IVION.
What should I do if I notice stitching artifacts in my panoramas?
If stitching artifacts appear consistently in the same location across multiple panoramas, it may indicate an incorrect calibration of the device.
Is it important to scan all visible objects with laser scanners?
Yes, it is crucial to ensure that everything visible in the panoramas was also scanned with laser scanners to maintain accurate depth information.
How close can I get to objects when capturing panoramas?
It is recommended to keep a distance of at least 1 meter from individual objects to avoid distortions in the panorama.