Messages

31

General / Re: Modeling trees > Pseudo Points of Interest

« on: August 31, 2014, 12:50:30 AM »

Hi,

I have had some success with modeling vegetation, and am also interested in developing a robust workflow for trees. The main problem you will have is also that the the tree branches are not completely still during your photography, which can also lead to a type of 'halo' effect around finer detail areas like leaves and small sticks.

https://www.youtube.com/watch?v=ystjSGqUBQI&list=UUNp0vouv7d04EqdXvH1phgw

One solution I have found is to use a stereo camera system which takes two images simultaneously, this helps to remove some of the spurious points.

You can use image processing software (I use MATLAB) to automatically detect and mask a decent part of the white regions, but a perfect mask is probably not feasible.

You can save the point cloud as a .ply file and then use a color filter to remove points within a specified range of RGB values. So far I have used such a filter to remove vegetation from point clouds and it seems to work pretty well...

Best,

Jeff

32

General / Re: The size of coded markers for UAV acquisition

« on: August 31, 2014, 12:44:10 AM »

Hi,

We use white matte markers which are 50 x 50 cm with a large X in the center, and numbers written in black on two sides of the marker to distinguish 6 from 9, etc.. Most of our flights are from 100m and we have an effective image resolution of 2 cm/px.

Under decent lighting, I have had no problems identifiying the markers from the aerial imagery, but thus far the marker location has been performed manually.

Best,

Jeff

33

General / Re: View Points point color

« on: January 08, 2014, 11:55:16 AM »

Hi,

It may also be worth noting that the blue points displayed in PhotoScan are not always the same points as those exported in the *.out file. I noticed this when comparing the PhotoScan point-image overlays against a manual overlay of the exported sparse cloud point locations onto the same images.

-Jeff

34

Bug Reports / Export Cameras - False Pixel Positions Exported

« on: January 08, 2014, 11:37:21 AM »

Hi,

Using the latest release (1.0.0 build 1795, 64 bit) there is a problem with the pixel positions exported to the bundler *.out file format. This error occurs after aligning photos and then removing points using gradual selection with the image count filter.

A workaround is that after saving the *.aps file and restarting the program, the correct pixel locations are then exported by PhotoScan to the *.out file format.

-Jeff

35

Bug Reports / Re: .obj imports with 0 faces

« on: December 01, 2013, 10:09:22 PM »

Hello Alexey,

Yes, you are correct. The .obj I sent you only contained the vertices. My apologies!

Using  version 1.0.0  build 1780 I have tried both .ply and .obj models (with faces and they are both working correctly. Problem solved.

Jeff

36

Bug Reports / Re: .obj imports with 0 faces

« on: December 01, 2013, 04:51:42 PM »

Hello Alexey,

I've installed 1.0.0 and now the .ply mesh is working on import, only the .obj mesh is not working properly. I sent you both meshes as requested.

Thanks!

Jeff

37

Bug Reports / Re: .obj imports with 0 faces

« on: December 01, 2013, 01:40:58 PM »

Has this issue been resolved?

I am using 0.9.1 build 1714 and all imported .obj or .ply meshes still show zero faces.

Jeff