Messages

31

General / Re: Wide angle lens for full frame Nikon mirrorless camera

« on: December 12, 2022, 10:01:11 AM »

Hallo EGN,

to my experience behind 24 Mpix lens quality matters a lot. You need very good lenses for 44 Mpix cameras. If you have that, you need less photos for same SD (sampling distance)
Besides that, as allways, you need good stereo cases to get good quality out of stereo photogrammetry.


Kiesel

32

General / Re: Problem with using depth maps of smartphones

« on: December 09, 2022, 09:16:02 PM »

Hi johnnokomis,

are you able to import the photos with depth maps in Metashape or are those depth maps generated in Metashape? The depth maps in Metashape are color coded and not gray coded depth maps. In a former test, I was able to import depth maps and they were color coded as well.


Kiesel

33

General / Re: Problem with using depth maps of Google Pixel smartphones

« on: December 08, 2022, 12:22:48 PM »

Dear Agisoft team,

Yesterday we tried to import photos with depth maps made with the iPhone 13 Pro in portrait mode. The depth maps looks much better than those of the Google Pixel 4a 5G.
But it wasn't possible to import those photos in both Metashape versions 1.84 and 2.0 beta via 'Import/ Import Depth Images...'. We get an error (see Appendix) that the

'photo... contains depth data with "relative" accuracy value. Only photos with "absolute" accuracy from True Depth camera are supported.'

Why is that? In the freshdesk article https://agisoft.freshdesk.com/support/solutions/articles/31000162212-smart-cameras-with-depth-sensor-data-processing is stated:

Depth sensor is installed on the range of Apple devices with TrueDepth camera, that is the front camera of iPhone starting from the 10th version (except SE) and the front camera of iPad pro.

Even there seems an error that the front camera is mentioned in the freshdesk article and not the back camera with it's ToF-sensor, shouldn't it work?

I have uploaded these photos here, so that you can test them: https://drive.google.com/file/d/1IH27FCKRliK_TIwP4309y29cyGTSFyqC/view?usp=share_link

Please help!

Best regards,

Kiesel

34

General / Re: New Import Depth Image feature

« on: December 07, 2022, 10:56:22 AM »

Hello Johnnokomis,


Yes an improved, error less prone, import of photos with depth maps would be nice.

I have found this for extracting depth maps with Exiftools in 'Jay's Technical Talk':

exiftool original_image.jpg -trailer -b > depth.jpg

So it should also be possible to sort photos without depth maps out before import in Metashape . Btw. I have found that a too fast photo shooting can lead to missing depth maps as well.

There is also a web page, which can show and extract all layers of a Portrait.JPG https://www.photopea.com/.

In my own tests with my Google Pixel 4a 5G, which doesn't have a ToF-sensor - only a dual pixel sensor design, I have found that the depth maps of it are unfortunately that bad for low textured surfaces that this added no advantage over normal processing. I think this is where a ToF-sensor makes a difference. Would be interesting to see some results from your LG V60.

Best regards,

Kiesel

35

General / Re: Wide angle lens for full frame Nikon mirrorless camera

« on: December 06, 2022, 02:00:09 PM »

Generally I prefer prime lenses over zoom lenses in photogrammetry. Zoom lenses are allways a bigger optical compromise by their construction, which results often in lower resolution, and lower optical stability (more moving optical elements), more instable focal length, edge softness and so on than prime lenses. If you want to use zoom lenses it is good to tape them to a specific focal length.

Yes you can use manual prime lenses in Metashape. In 'Tools/Camera Calibration... you can input a focal length as starting point, you can even use film cameras with fiducial marks. You should use the lens as its aperture where the lens performs best, its 'sweet spot', so something between 5,6 to 11, depending on the lens.

Not for photogrammetry but photography you get some insides here: https://www.cambridgeincolour.com/tutorials/lens-quality-mtf-resolution.htm

Best regards

Kiesel

36

General / Re: Standard Panorama stich

« on: November 29, 2022, 10:05:52 AM »

Hi bruno.camp,

in the tutorial I have linked in my last post is also a link to sample data. These sample data are from a rectilinear frame camera, so yes it is possible and it's purpose to use such camera to make a panorama.

But for an aerial panorama without keypoints in the sky, you need to give Metashape a little help by importing the directions the photos are made. To use template based stitching is possible in such programms like PTGUI. Those panoramas can be imported in Metashape.

Best regards,

Kiesel

37

General / Re: Aerial Lidar data merge Terrestrial laser scan data

« on: November 28, 2022, 06:01:20 PM »

Hi TJ Jeong,

I havn't done this myself (because we don't have aerial Lidar), but I think that both should be in the same coordinate system. Doesn't you have GCPs in the same system for both?


Best regards

Kiesel

38

General / Re: Aerial Lidar data merge Terrestrial laser scan data

« on: November 28, 2022, 02:00:55 PM »

Hi TJ Jeong,

you might have a look here for Metashape 2.0 beta:

https://agisoft.freshdesk.com/support/solutions/articles/31000168474-terrestrial-laser-scans-processing-in-metashape-2-0-0

Regards

Kiesel

39

General / Re: Thermal Image Alignment using RGB Images

« on: November 28, 2022, 10:17:19 AM »

Hi Corensia,

just an idea, what about processing as camera rig, where the RGB photos are used for alignment?

Regards


Kiesel

40

General / Re: Standard Panorama stich

« on: November 28, 2022, 09:45:22 AM »

Hi bruno.camp,

search in the help of Metashape for the term 'station', you'll find:

Building panorama
Metashape is capable of panorama stitching for images taken from the same camera position - camera station. To indicate for the software that loaded images have been taken from one camera station, one should move those photos to a camera group and assign Camera Station type to it. For information on camera groups refer to Loading images to the project section.

To build panorama

1. Select the Build Panorama command from the Workflow menu.
2. Setting parameters for building panorama in the Build Panorama dialog.
3. Click OK button for starting generate panorama.
4. The progress dialog box will appear displaying the current processing status. To cancel processing click Cancel button

...

You might have a look at this tutorial too:
https://agisoft.freshdesk.com/support/solutions/articles/31000148830-spherical-panoramas-generation-

Regards

Kiesel

41

General / Re: Import e57 Laser Scans, Points and Images

« on: November 24, 2022, 12:28:20 PM »

Hello ForensicDJS,

I have just tried this with version 2.0 beta, because we only have the pointcloud of one object and none additional photos.

While the import of the e57-format pointcloud was easy, the import of the panoramas out of the e57 pointcloud was not. As solution we have exported the panoramas from Leica Cyclone and imported them with there coordinates in Metashape. Before the import the panoramas were developed out of the exported EXR-files to TIFF. We need to align the panoramas to be able to generate an orthomosaic in Metashape and not all panoramas could be aligned (only 22 of 25). For the orthomosaic a lot of masking (out the scaffold) was necessary, because when you work with panoramas every point is theoretical seen from every panorama, so the function filter photos by point shows every time all panoramas.

We have exported the DEM, generated out of the pointcloud alone, and the orthomosaic and used both in Autodesk Civil 3D. The quality of the orthomosaic is only good enough in the near of every scan station and decreases fast with higher distance from the scanstation because of the lower and lower intersection angle to the ground. So for a ground orthomosaic and not a facade it is really not recommend. Another issue are the errors of the Leica RTC360 panoramas near the tubes of the scaffolding.


Hope this helps,

Kiesel

42

General / Re: incomplete point selection in point clouds

« on: November 24, 2022, 10:02:46 AM »

Hello Alexey,

yes indeed  Visible Selection was ticked on in Selection Tools (even I haven't done that), thanks!

43

General / incomplete point selection in point clouds

« on: November 23, 2022, 10:49:24 AM »

Dear Agisoft team,

I have difficulties with the current selection tool for a long time, especially when I work with deeper point clouds like imported laserscans. The current selection tool seams to be restricted to depth, so I have to select again and again the same area to a deeper and deeper space up to ten times and more and even then I can't be sure that I have selected all points in this area, because when I zoom out some "new" points arise. And in this outzoomed view it is of course more difficult to make a precise selection.  Have I overseen something? I hope for a solution soon for an otherwise nice product.

Best regards,

Kiesel

44

General / Re: Agisoft Metashape 2.0.0 pre-release

« on: November 17, 2022, 05:47:49 PM »

Hello Alexey!

thanks for the fast answer! When I switch the interpolation option to  'Extrapolated' it works, thank you very much!

But the 'Build Orthomosaic...' option in the workflow dialog is still grayed out. Are the panoramas included in the point cloud, not enough?
Are additional photos needed? But even when I add the extracted panorama photos to the project and import the reference data (positions) for them (see appendix) the 'Build Orthomosaic---' is still grayed out. Probably because they are not aligned by Metashape? But as I have written the alignment fails for 4 panoramas out of 28.

Regards

Kiesel

45

General / Re: Agisoft Metashape 2.0.0 pre-release

« on: November 17, 2022, 04:23:41 PM »

Dear Agisoft team,

I tried to make a DEM (for a later orthophoto) out of a classified imported RTC360 laserscan in Metashape 2.0, but after processing I get an error: Empty DEM. Is it even possible to make a DEM out of a laserscan only in Metashape 2.0?

(The project contains just the colored laserscan only and none additional photos. When I try to align the panorama photos from the scanstations, only 24 out of 28 align and unfortunately I don't have additional photos this time, that's why I tried it with the pointcloud alone)


You'll find the log-file here: https://www.dropbox.com/s/duwff63tllbk3vy/Agisoft_log_DEM_error.txt?dl=0

Best regards

Kiesel