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Messages - rowild

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1
Thank you very much for all your help and support, @tazzo!

2
According to the specifications, my drone camera has a focal length of 24 mm (Equivalent 35mm).

Which value do I have to use? 24mm or 35mm?

3
I let you know. I now need to check on your new statement "if pixels are squared"...

4
Thank you again! I will try with 0.00333 then  ;D

5
I found a discussion on the DJI forums about the pixel size of the mavic pro:

https://forum.dji.com/forum.php?mod=viewthread&tid=264807&page=1#pid2741845

3.33nm it is, they say. That should be 0.00000333 mm.

Would that be the correct number to enter in said input fields?
Do things like zoom (which I do not use in my current case) influence pixel size generallly?

6
Good idea! I'll do that!

Thank you!  :D

7
You are totally right when you ask "Why px value?" - there is clearly a "(mm)" next to "Pixel Size"! I do need new glasses, as it seems. Or better even new eyes!  :-[

Anyway, my original material does not provide any such value. How can I define it?
(As mentioned above the footage is from a DJI Mavic 3 drone (camera specs in the link above). )

8
I use the video importer to extract images from there. Usually I want to extract every 15th frame from a 30fps video, so I enter 15 in the "frame step" input field, which offers a name template in the form of "frame{filenum}". But it seems it does not count the frame number, but instead the consecutively extracted file numbers.

Shouldn't it rather count the frame number given that the template says "frame{filenum}"? "frame2" is indeed not "Frame 2", when every 15th frame is extracted.
Using the correct frames would also help to identify if a specific sequence needs more images or not, so I could better pinpoint the sequence needed and extract only the images of that respective area.

9
I just use Metashape's Video importer and let it extract the images from an oiginal. But there is still no info about the "Pixel Size". See screenshot.

(BTW: I cannot always use the original video, because it is shot in D-Log. I have to edit it first.)

But again: The input fields require a px value – you mention a value in mm-unit. How does that go together? Could you please post an image of what such a value could look like? Thank you!

10
Thank you for the quick answer! - there is  o such meta data in my images, because i sent the original video through Davinci Resolve and then through Blender, the latter creating the images from the video.
Just to get an idea: what would such a number look like? You say "less than a mm", but the software requires px values....

11
General / Which values does "Pixel size" in "Camera type: Frame" expect?
« on: December 27, 2023, 02:21:18 AM »
I do not understand which values I am supposed to enter in the "Pixel Size" field, which appears when the "Frame" camera is chosen. The screenshot shows that I currently use 1920x1012 which is the (edited) output of a video of a DJI Mavic 3 camera (which is a frame camera, right?). (The specs of that drone camera can be found here: https://www.dji.com/at/mavic-3/specs)

I have a feeling that I am misunderstanding that input field... Any clarification would be most welcome! Thank you!

12
General / Re: Agisoft Metashape 2.1.0 pre-release
« on: December 27, 2023, 02:14:59 AM »
A somewhat cheeky question: do the pre release version reset the trial period, if I have 2.0.3 Standard (Trial) installed?

13
General / Re: How to remove the "snow" at the edges of the point cloud
« on: December 21, 2023, 10:10:24 PM »
Oh! I didn't know that! Thank you for pointing that out! I will try that immediately!

14
General / Re: How to remove the "snow" at the edges of the point cloud
« on: December 21, 2023, 08:09:32 PM »
Thank you very much! That worked quite fine! Specifically the deselection feature (using SHIFT + mouse) was new to me. :-)

(Currently I am only interested in the point clouds, which I like very much from an estetically, and not the meshes. I hope that's all right.)

15
General / How to remove the "snow" at the edges of the point cloud
« on: December 21, 2023, 02:42:13 AM »
Hi!

I am rather new to Photogrammetry and to Metashape, which I use int he standard edition's trial version at the moment. I am particularly fascinated by the point cloud results Metashape generated and use them purely as "art".

I would like to get a little better and am currently struggeling with the problem of removing white noise at the edges of many of my point clouds. As the attached image shows, the trees in the point cloud seem to have snow on them – but there hasn't been any snow at the time of shooting those images. I assume it is an "artifact" from the bright background?

I've read that I can use the point cloud's filter option with values from 0 to 3. But those remove some green from the ground first, before any white is touched.

Is there another way to handle this "phenomenon"?

Thank you!

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