Fiducials and DEM strange behavor

[d.portillo@habitatea.es]

Hellow, I'm trying work with old photograms, when I put all fiducials ( 8 ), I obtain a good errors  but when I generate dense cloud and depth maps, the depth maps are cut.
I tried to only put 4 fiducials and the errors are worse but depth maps aren't cut  .
some one knows why this behavor, I doing somethig bad or is a metashape bug?
I'm working with version 1.5.5 bulid 9097 (64bit)

[Alexey Pasumansky]

Hello d.portillo,

We have investigated the problem based on the project that you have provided to support team and it appears that the problem is related to the incorrect estimation of the principle point location for the case of 8 fiducial marks, due to their non-uniform distribution.

We will check, if the problem can be sorted out internally in the next updates, but meanwhile we recommend to use only four markers in your case - one by each side of the image.

[d.portillo@habitatea.es]

Do you have idea when this will be implemented? I have other photos with less fiducial an all asimetric 

[Alexey Pasumansky]

Hello d.portillo,

The fix will be available in the next pre-release update.

I'll see, if we could send an intermediate version for you to test on similar projects.

[d.portillo@habitatea.es]

Thanks Alexey, that sound great, I'll wating that prerelease.

[d.portillo@habitatea.es]

Hi Alexey, the problem is fixed in the last pre-release build 9487?

[Alexey Pasumansky]

Hello d.portillo,

Yes, it should be fixed in the latest pre-release. Let me know, if you are still observing any problems with non-symmetric fiducial marks distribution.

[d.portillo@habitatea.es]

Thanks for fix this problem, I test it and now I haven´t got any problem with deph maps and iregular fiducials. I observed two posible improvemets:

• On photos with fiducials on 4 corners  deph maps don't fill all photo, leave a margin with out deph map, with multiple and iregular fiducials it fill all space.
  
• When I activate "Show deph maps" my CPU go to 100% and delay 10-15 minutes to load one deph map, on previus versions I didn't have this problem.[

[Alexey Pasumansky]

Hello d.portillo,

According to the screenshots here might be some considerable difference in alignment, therefore the depth maps are also different.
If we can re-use the images that you have already submitted to us, can you send the projects for both cases to support@agisoft.com, so that we could re-build the depth maps and reproduce the results? (to reduce the project size you can remove the depth maps, dense clouds and other processing products, but sparse cloud).

As for the depth maps display problem, which quality you are using and whether there are any photoview related tweaks enabled?

[d.portillo@habitatea.es]

Just now I send you my proyect and fotos.
The depth maps are hight quality an aggressive filtering. I send you two screenshots about photo preferences an tweaks.

Thanks for your support, I see better aligmend and noise filtering on new prerelease.