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Author Topic: How deal with buildings an trees  (Read 8425 times)

MartinBim

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How deal with buildings an trees
« on: March 04, 2014, 03:11:41 PM »
Hello,

I've got a general question about shooting an building with a lot of trees in front of it.

How do I manage to shoot, for example, this building of the attached photo? Because in most similar cases I get a very very noise point cloud. Is there any way to deal with?

Thank you.

Martin

admir

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Re: How deal with buildings an trees
« Reply #1 on: March 04, 2014, 04:32:47 PM »
Hello,

I've got a general question about shooting an building with a lot of trees in front of it.

How do I manage to shoot, for example, this building of the attached photo? Because in most similar cases I get a very very noise point cloud. Is there any way to deal with?

Thank you.

Martin

Can you approach very close to building so your view is not obstructed. Then, you will need to shoot building from more photos (top left corner, middle left, bottom left corner etc...), shoot global photos of building with trees in front and trees from building side. Photoscan will use both all 3 "sets" of images for aligment. Since you shot volume, you can remove trees from dense point cloud when building mesh. Disable images like one you posted when creating texture and use only close up ones.

Hope this helps,
Admir

Exhale

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Re: How deal with buildings an trees
« Reply #2 on: March 04, 2014, 05:52:49 PM »
Admir
Also, cutting down the trees could be an option :) :)

admir

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Re: How deal with buildings an trees
« Reply #3 on: March 04, 2014, 11:20:40 PM »
Admir
Also, cutting down the trees could be an option :) :)
[/quot
Nah, we are all nature lovers... finding building without trees would be better :)

MartinBim

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Re: How deal with buildings an trees
« Reply #4 on: March 05, 2014, 04:36:19 PM »
Thanks for the replies  ;D

Cutting trees is no option but would solve the problem ...

I will try this part of the building with a lot of picture from as many different angles as possible and I its enough to get an acceptable but not perfect model

greetings
Martin

admir

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Re: How deal with buildings an trees
« Reply #5 on: March 05, 2014, 07:12:32 PM »
Thanks for the replies  ;D

Cutting trees is no option but would solve the problem ...

I will try this part of the building with a lot of picture from as many different angles as possible and I its enough to get an acceptable but not perfect model

greetings
Martin

I think you will get much better model (precision and less noise wise) with many close up pictures, rather than taking pictures from distance as your example.

A

gamegoof

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Re: How deal with buildings an trees
« Reply #6 on: March 07, 2014, 11:09:04 PM »
its funny, I view the world in how easy it would be to scan it or hard in this case.. Taking closeup photos I agreed with but the quality may not be the best unless you do it section by section and connect the chucks together. Otherwise try sparse, closer coverage. If the trees were further back you could try taking more photos but masking out trees in each section but these branches are too small and numerous..

admir

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Re: How deal with buildings an trees
« Reply #7 on: March 07, 2014, 11:44:44 PM »
its funny, I view the world in how easy it would be to scan it or hard in this case.. Taking closeup photos I agreed with but the quality may not be the best unless you do it section by section and connect the chucks together. Otherwise try sparse, closer coverage. If the trees were further back you could try taking more photos but masking out trees in each section but these branches are too small and numerous..
You dont need to do in chunks, place all photos in single chunk, Photoscan will do the miracle :)

Admir

gamegoof

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Re: How deal with buildings an trees
« Reply #8 on: March 09, 2014, 12:28:15 AM »
Admir: Yeah I just assumed if you used many cameras to do some side of the building, that alone could add up to so many cameras that if you tried to do the whole building with that kind of detail, it would be 100's of photos and PS would die (its died on me when i push it too hard)

I guess if he used sparse coverage like I said, it might be ok

admir

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Re: How deal with buildings an trees
« Reply #9 on: March 09, 2014, 12:01:13 PM »
Admir: Yeah I just assumed if you used many cameras to do some side of the building, that alone could add up to so many cameras that if you tried to do the whole building with that kind of detail, it would be 100's of photos and PS would die (its died on me when i push it too hard)

I guess if he used sparse coverage like I said, it might be ok
I took session of large piece of quarry, with 140 images using that technique and my laptop (i5 with 32gb of RAM) managed to solve it well on High settings. Got ~500 000 points in sparse cloud. Also did similar building (all sides not just one) with ~80 photos using Canon 1100D and PS havent had any problems in single chunk.
When you do aligment, visually check cameras that overlap or that PS asume are taken from "same" place, they will be positioned in 3D view in same location, try removing some of them without loosing details or to much points in spare cloud. This will help speeding building dense point cloud and mesh and less RAM usage.

Admir