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Messages - Kiesel

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31
Hi cyrilp,

in sparse cloud, dense cloud and mesh you can right click and then choose 'filter photos by point' and get the filtered photos which correspond to that point. But that says nothing about which one is used for the texture.
Even you can disable all photos until one and generate a new texture, that's probably not what you want.


Best regards,

Kiesel

32
Hi JJ,

Quote
right now i use a Samyang 7.5mm manual focus lens on a micro four thirds body.  i just set the lens to infinity and pretty much all images are sharp but i avoid moving in closer to the subject

i'd like to change to an auto focus lens to have more flexibility and was looking at the Panasonic 8mm

I think that's not a good idea to work with autofocus instead of fixed focus, because this way you change camera intrinsics a little bit for every shot, so your camera calibration get worse. Generally fisheyes have a very wide depth of field. I would set the focus to something like your middle distance (hyperfocal value) and tape this distance down and not to infinity b.t.w..


I don't know how well Metashape can handle different fisheye projections (stereographic, equidistant, equisolid, orthographic) and if there are any problems at all to a specific fisheye projection.


Best regards,

Kiesel

33
General / Re: Non-coded cross targets automatic detection failure
« on: September 21, 2022, 08:53:44 AM »
3DWinter,

I use higher tolerance values (these are dimension less) if not all markers are detected at the first time for standard values (2). But before I use any higher tolerance value I erase all already detected markers, because otherwise I get double markers with the same number in the marker list. 
The maximum residual is only avaiable for non-coded targets (and not for coded targets). This value is in pixel and to my understanding it means the tolerated maximal residual of the detectected circle center or cross section.

Hope it helps

Kiesel

34
General / Re: Non-coded cross targets automatic detection failure
« on: September 20, 2022, 01:00:00 PM »
3DWinter,

it works quit well unless your targets are not too small and you haven't structures which looks similar to targets, for example cobblestones.

In another post Alexey has written "The size of non-coded targets actually are not so critical (at least there are no max limits), but I suggest to have at least 4-5 pix radius for them." But perhaps this was meant for the type circle and you have to double this for the non-coded cross.


You can also use targets of different sizes in one project to overcome the size limitation.



Best regards

Kiesel 

35
General / Re: Swapping Images After Alignment
« on: August 17, 2022, 09:42:37 AM »
Hi RoryG,

should be possible, because this is the normal workflow when you work with pattern projection by using the photos with pattern projection for alignment and then replacing those photos with identical named photos without pattern projections located in another folder.

Regards,

Kiesel

36
General / Re: Numpad navigation removed from 1.8.2 why ?
« on: August 11, 2022, 09:28:44 AM »
You'll find all predefined views here: see attachment. You can hit the numpad numbers without using the menu as you already explored.

37
General / Re: Lens not detecting chess board
« on: July 28, 2022, 08:48:58 AM »
Hi David,

Quote
We have images of a chess board pattern, however the program is not picking the pattern out. This is likely because the board is too far away from the camera - despite good image clarity.

you can play with the tolerance value and maximum residual value in the 'Detect Markers' menu  for 'Cross (non coded)' targets and eventually use the 'Ignore masked image regions' to avoid detecting markers in unwanted regions.

Quote
can i use calibration information from a different zoom? (I suspect not...)

Not a good idea.

Regards,

Kiesel

38
General / Re: automatic measure of diameter
« on: July 25, 2022, 04:10:17 PM »
Hi Marina,

perhaps this is something for you (sorry not in Metashape):

http://www.jpe-innovations.com/downloads/Fit-sphere-through-points.pdf

It seems that the free Cloud Compare can already do that:

https://www.danielgm.net/cc/forum/viewtopic.php?t=4933

Best Regards,

Kiesel

39
General / Re: Radiography - 3D imaging
« on: July 21, 2022, 11:17:58 AM »
There is that open source project too:

https://www.slicer.org/

40
General / Re: Radiography - 3D imaging
« on: July 21, 2022, 11:15:27 AM »
I have found this.

http://blogg.vm.ntnu.no/xraynet/2015/04/28/using-photogrammetry-on-digital-x-ray-images-2/

Looks like it was done with the former Photoscan in 2015.



41
Hi Frmoraes,

yes and don't forget to shoot oblique photos too, the better the photo intersection the better the bundle optimisation.
If I were you, I would investigate in what is the best camera configuration and have a look at camera calibration too.

Best regards and success,


Kiesel



42
General / Re: Radiography - 3D imaging
« on: July 20, 2022, 02:20:27 PM »
Alexey,

Ah yes that was a funny one by Mark Florquin!  ;D


43
Hi Lukas,

perhaps there is a mix of photos with and without GNSS EXIF-data? Have you already disabled all photos in reference pane? (To be absolutely sure you can erase GNSS EXIF-data and try again, but leaf camera data intact, because you have a lot of different cameras when using tourist photos.) There is also the possibilty that single cameras can't be well calibrated, if you use a lot of tourist photos only and not against a well calibrated general camera.

Quote
My work-around if we don't find a solution would be to copy my professors project and slowly add my new images to it and align them. If it fails at one point I know which pictures are bad for the alignment. It will take some time but it's the only thing I can think of...
  You can do that already in the workspace pane by de/activating single cameras.

Best regards,

Kiesel

44
Hi Frmoraes,

Quote
About the cardboard, I'll change this scenario. In my new test, I'm going to put the markers on the body of the object (that is wood).
That's better!

Quote
The coordinate system I've got with a total station was set to X=1000; Y=5000; Z=100. And as you said Z is the height. For the Metashape, I firstly changed Z_axis with Y_axis, and then I got photo4 as result.
I wouldn't do this, because it isn't necessary. Also your wooden plate isn't standing vertical as can be seen in photo 2. You can later easily define an (orthogonal) orthomosaic and DEM to markers at the wooden plate.

Quote
In one of my future tests, I'm going to add oblique pictures (something like a Maltese Cross configuration) and compare the results with only "central" pictures.
Good!

Quote
When you said about adding +/-90° and 180° rotated pictures, I should take just some pictures in this configuration, or I should take again all the pictures in this configuration?
Only some are enough.

Also you should tick the local coordinate system for markers reference in reference settings.



Kiesel

45
General / Re: Radiography - 3D imaging
« on: July 19, 2022, 09:43:35 AM »
Hi JakubZaruba,

I don't think that you'll have success with Metashape or any other photogrammetry package, because normal photogrammetry works with the laws of reflection and central perspective only and not with translucent materials.

Probably you'll have more success with mathematics and software used in computer tomography.


Best regards,

Kiesel

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