| Product(s): | ContextCapture | ||
| Version(s): | N\A | ||
| Environment: | Windows | ||
| Area: | N/A | ||
| Subarea: | N/A |
Problem
We have discovered that the drone Phantom 4 RTK drone camera FC 6310R can now provide two kinds of images: with the original lens distortion OR rectified using the DJI GSR application
This creates a problem in that it is currently not possible for ContextCapture to automatically detect if the images are rectified or not as the EXIF values are similar (focal length and sensor size), and the FC 6310R camera profile that is currently automatically applied from ContextCapture database assumes that the images are in their original state (with high distortion)..
Solution
Take photos of the new area of interest
Ensure the new dataset includes enough photos to generate a good 3D model of the area that has changed.
If you find yourself in this situation, there is a simple solution as described below
- If the images have been rectified and you experience bad Aerotriangulation results, select the relevant photogroups and apply the FC6310 camera calibration from the ContextCapture camera database (with the following distortions values: K1:0.00350827 K2:-0.0190287 K3:0.016921….)
- If all the images are in their original format, the default camera calibration should remain as it is: FC6310R 3:2 calibration from the camera database (with: K1: -0.268927 K2:0.111628 K3: -0.0325915…) Unfortunately, if you are working with datasets that include images that are rectified and others that are not, all the images will be added in the same photogroup after the initial import, as they contain the same EXIF information. However, it is quite simple to identify which image is rectified and which one is not, especially as the original ones have a vignetting (dark effect) effect in the corners.
Note:
The team is currently working on a native solution in ContextCapture to deal with this issue.
NB
This issue has been resolved in ContextCapture Update 20. Only users of versions prior to Update 20 are likely to be affected.
Original Author:
Felix James