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Author Topic: Surface roughness and low resolution  (Read 8200 times)

prime

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Surface roughness and low resolution
« on: August 26, 2015, 05:17:18 AM »
hollo
I tried again and again but I can't get good result

Please look at attached images

I can't recognized object

what is the problem with me?

this is information of shooting
1) Camera : Cannon 550D DSLR
2) ISO : 100 or 200 or 400 (I changed ISO but the result almost same)
3) F : 5.6
4) object to camera distance : 30~50cm
5) catched images : 50~80 shoots

information of photoscan work flow
1) aligning photos
  - accuracy : medium (I tried "high" but the result does not improved)
  - pair preselection : disable
  - point limit : don't care

2) builing dense point cloud
  - medium(I tried "high" but the result does not improved)

3) building mesh
  - medium(I tried "high" but the result does not improved)

please look at attached image
surface roughness is very high with poor resolution

please help me!




prime

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please help me!
« Reply #1 on: August 26, 2015, 05:25:07 AM »
hollo
I tried again and again but I can't get good result

Please look at attached images

I can't recognized object

what is the problem with me?

this is information of shooting
1) Camera : Cannon 550D DSLR
2) ISO : 100 or 200 or 400 (I changed ISO but the result almost same)
3) F : 5.6
4) object to camera distance : 30~50cm
5) catched images : 50~80 shoots

information of photoscan work flow
1) aligning photos
  - accuracy : medium (I tried "high" but the result does not improved)
  - pair preselection : disable
  - point limit : don't care

2) builing dense point cloud
  - medium(I tried "high" but the result does not improved)

3) building mesh
  - medium(I tried "high" but the result does not improved)

please look at attached image
surface roughness is very high with poor resolution

please help me!




sastun1962

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Re: Surface roughness and low resolution
« Reply #2 on: August 26, 2015, 10:13:49 AM »
Hi prime,
have you try with an object not replective like this? I think that the problem are due to the reflections.

dimaego

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Re: please help me!
« Reply #3 on: August 26, 2015, 10:34:52 AM »
can you upload ur point and dense cloud?
trying selecting all ur photos in photoscan, right click and Estimate image quality. what are the results?
u should leave ISO at 100

dimaego

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Re: please help me!
« Reply #4 on: August 26, 2015, 10:36:54 AM »
also what focal length u using? the car looks a bit shiny to me, which can cause problems aligning the photos

prime

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Re: please help me!
« Reply #5 on: August 26, 2015, 11:11:35 AM »
thank you dimaego!

actually I think lack of lighting

I detected my photo is not good quality

when I zoom out my photo there are poor quality

Is it help to me setting up lighting?

thank you very much dimaego!

prime

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Re: Surface roughness and low resolution
« Reply #6 on: August 26, 2015, 11:14:54 AM »
dear sastun1962

thank you for your suggest!

I try again with another item!




Alexey Pasumansky

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Re: please help me!
« Reply #7 on: August 26, 2015, 11:18:01 AM »
Hello prime,

Usually plastic untextured surfaces are problematic for reconstruction, as almost no feature points can be detected there.
Best regards,
Alexey Pasumansky,
Agisoft LLC

Ingsayyad

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Re: Surface roughness and low resolution
« Reply #8 on: August 26, 2015, 11:21:49 AM »
If you want to you the same model,  use some projection pattern or spray it  etc. The disadvantage is that you have problem with texture.