Mesh and Orthophoto anomalies

ODM
1

From @rionlerm on Mon Jan 16 2017 11:24:44 GMT+0000 (UTC)

Hi all,

my orthophotos contain strangely-COLOURed patches (there were some overcast conditions though) and TOPOGRAPHY in river datasets I ran through the latest ODM Master branch. I am inclined to say that the previous ODM version did a better job. Maybe there are some para’s I can set to improve results? Also, the trees did not even appear in 3D like before?

Meshlab snapshot below:

3d_snapshot00
3d_snapshot001301×666 454 KB



Copied from original issue: Mesh and Orthophoto anomalies · Issue #454 · OpenDroneMap/ODM · GitHub

2

From @dakotabenjamin on Tue Jan 17 2017 14:18:16 GMT+0000 (UTC)

Try adding the parameter --mvs_texturing-skipGlobalSeamLeveling. This is a documented problem with MVS Texturing that has not been addressed. If you don’t mind, could you post that image in the thread linked above as added documentation of the issue?

3

From @dakotabenjamin on Thu Jan 19 2017 21:10:37 GMT+0000 (UTC)

@rionlerm nmoerhle says in their comment that

The issues of the other datasets look different to me, I belief that alignment (and thus the adjustment of non corresponding colors) is more of an issue there.

This could be attributed to three things IMO:

  1. The images you are using are not calibrated. Have you tried that?
  2. Your point cloud is not as accurate as it could be. Try --use-opensfm-pointcloud
  3. The mesh being generated is not as accurate as it could be. This needs work on our end.
4

From @rionlerm on Fri Jan 20 2017 13:00:09 GMT+0000 (UTC)

Hi @dakotabenjamin ,I have been following some of the wrong colour testing you guys did.

  1. Calibrated colour-wise or location-wise?
  2. Tried --use-opensfm-pointcloud but, memory issues on my 4 cpu 12 GIG RAM PC even with 77 photos? I will try it again on this dataset though.

Must mention the --mvs_texturing-skipGlobalSeamLeveling solved some colour issues!

5

From @dakotabenjamin on Fri Jan 20 2017 20:03:18 GMT+0000 (UTC)

Calibrating the camera to remove image distortion. This can cause alignment issues. I have a simple script here but there are other ways (Agisoft, for example, has an undistort function).

Try running --use-opensfm-pointcloud with only 1 core: --opensfm-processes 1

6

From @rionlerm on Mon Jan 23 2017 07:10:23 GMT+0000 (UTC)

Thanks for the responses @dakotabenjamin ,

I am going to attempt the script with checkerboard for undistorting my images and post here with --use-opensfm-pointcloud results.

Regards,
Rion