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Refinement makes my scans look worse?

The place for all topics related to the 'Shapefusion' tool of DAVID.

Refinement makes my scans look worse?

Postby Micropuller » Wed Sep 25, 2013 10:38 am

When I was doing my first scans, I thought the lightly rough surface was due to the fact that I was scanning 3D printed objects.
But yesterday I noticed that after cleaning up (before fusing) the scans were much smoother.
So I tried fusing them without refinement and the end result looked a lot better.
In fact, the higher I turned up the fusing resolution, the worse the end result was when I used the refinement option.
Has anybody got an idea what's going on?

Resolution 500, no refinement:
Image

Resolution 500, with refinement:
Image

Resolution 2500, no refinement:
Image

Resolution 2500, with refinement:
Image
Micropuller
 
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Re: Refinement makes my scans look worse?

Postby Sven » Wed Sep 25, 2013 4:37 pm

Unfortunately Refinement can have that side effect. Especially when the scans are not perfectly aligned. I recommend to TRY Refinement, but use only when it really improves the result. Depends from case to case.
With the next version, 3.9, coming soon, there will be improvements regarding that.
- improved Fusion result, so Refinement usually unnecessary
- more information in Tool Tips
- improved user manual: work in progress...

Sven
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Sven
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Re: Refinement makes my scans look worse?

Postby Micropuller » Thu Sep 26, 2013 8:13 pm

Thank you Sven, for the clarification. You mentioned the scans not being perfectly aligned. Is this something I can improve upon without changing my setup, or will I need better hardware?
Micropuller
 
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Re: Refinement makes my scans look worse?

Postby Sven » Fri Nov 29, 2013 5:24 pm

You need to make sure that the calibration is precise.
- precise 90° angle
- good setup (e.g. whole camera image is filled with calibration markers etc)
- absolutely no change of camera / projector position, focus... after calibration

Then the scans should fit together perfectly.

Sven
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