Messages

1

General / Re: Non-Coded targets automatic detection

« on: January 29, 2023, 05:34:41 PM »

For good detection, you need high-contrast and big enough targets without glare in your photos. The success of detecting none coded targets (cross type) also depends on the surrounding, in sand and grass surroundings we have very good detection rates but in stone surroundings, it could be that stones and their shadows are falsely detected as coded targets because they look similar to the algorithm.

To my understanding, with the 'Tolerance' value you can choose how much the target can differ from the ideal pattern for example in oblique photos, and with the 'Maximum residual' how large the residual of the detected center is.

Regards

Kiesel

2

General / Re: Import Orthomosaic

« on: January 17, 2023, 09:27:53 AM »

Hello dpitman,

the PSX format is the actual "new" native Metashape project format, in formerly versions it was PSZ format.

Best regards

Kiesel

3

General / Re: Cylindrical UAV Mapping (or Unwrap)

« on: January 09, 2023, 12:35:56 PM »

Hallo photo,

According to the Metashape help:

Metashape allows using one of the following projection types: Geographic, Planar or Cylindrical

Metashape can unroll cylinders only.
Your brigde looks more like a three-part basket arch so you have three cylindrical parts. If you can manage to split it in three parts (2 with the same smaller radius and one with a bigger radius in the middle part) it should be possible to get orthomosaics of them and mount them afterwards.

Another possibility is to do it in CloudCompare with "Unfolding a cloud along a polyline"
http://www.cloudcompare.org/doc/wiki/index.php?title=Extract_Sections#Unfolding_a_cloud_along_a_polyline
and then reimport it in Metashape and make the orthomosaic out of it.

Hope it helps

Kiesel

4

General / Re: Multiple calibration groups needed for multiple cameras of the same model?

« on: January 04, 2023, 09:21:59 AM »

Hallo djyoung,

each manufactured camera differ even from the same brand so I would separate them in different camera groups.

Best regards

Kiesel

5

Feature Requests / Re: meshed LIDAR texture from LIDAR COLOR

« on: December 20, 2022, 10:02:48 AM »

Dear Alexey,

we were able to extract all panoramas in Cyclone out of the TLS pointcloud and use those for texturing and orthophoto generation in Metashape. Would be nice if this would be a feature of Metashape.

Best regards


Kiesel

6

General / Re: Filtering point cloud requires multiple selections

« on: December 20, 2022, 09:47:15 AM »

Peterwatson yes if 'Visible selection' is ticked on, only the visible and not the points behind them are selected. This option is on by default, but Agisoft will change that.

Alexey has answered in another thread:

We will make sure that Visible Selection is unchecked by default in the next version updates.

Kiesel

7

General / Re: Problem with using depth maps of smartphones

« on: December 20, 2022, 09:31:23 AM »

For all interested,

According to the answer of the Agisoft team unfortunately only the front camera of the iPhone can be used in Metashape at this time, which isn't very practical because you don't see what you are photographing unless you have a second screen for that.
My hope was that the backcamera and the ToF-sensor of the iPhone can be used in a form like in Apples 3D Scanner app, Recon3Ds https://www.recon-3d.com/ or Dotproducts Dot3D for iOS https://www.dotproduct3d.com/ios.html. So there is still some hope that that will be the case in a future version.

Best regards

Kiesel

8

General / Re: Remove background from object

« on: December 13, 2022, 09:30:26 AM »

Hi MathildeV17,

you can for example restrict the bounding box to the skull or you can mask the background on your photos. It is also possible to erase (or classify) the background from the pointcloud and generate the mesh from the edited pointcloud.


Best regards,

Kiesel

9

General / Re: Problem with using depth maps of smartphones

« on: December 12, 2022, 10:27:01 AM »

Hi johnnokomis,

thanks!

I don't think that the depth maps of the iPhone Pro or the ones of your LG60V are a result of the ToF-sensor alone, I think they add some other calculations for example from dual pixel.



Kiesel

10

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

11

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

12

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

13

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

14

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

15

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