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Pattern Parameters

Problems, solutions and discussion about scanning with a video projector and stripe patterns.

Pattern Parameters

Postby Anti » Mon Jun 23, 2014 6:11 am

I asked myself, what the "pattern parameters" (Quality Default Speed) mean. Is the only difference that not that many 3d points are recognized? And is the precision and accuracy of these points equal over all modi?
Anti
 
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Re: Pattern Parameters

Postby MagWeb » Mon Jun 23, 2014 8:55 am

DAVID calculates one 3D point for each camera pixel that "sees" a surface.
Therefor the number of calculated points in a single scan does not depend on the pattern parameters.

Quality, Default, Speed are presets to switch between different scanning needs in a simple way. You can also set the pattern parameters manually via AdvancedSettings.

Against the number of calculated points the overall accuracy of the surface rises with a higher number of patterns as long as your system (projector and cam) can output/grab finer patterns.
Keep in mind that higher accuracy is only useful if the scanned surface needs this overall accuracy (e.g. if there are small details you need to grab), your calibration is good enough and your final fusion settings keep those details as well.
MagWeb
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Re: Pattern Parameters

Postby Anti » Mon Jun 23, 2014 9:07 am

Thanks. This explains a bit.
Anti
 
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Joined: Sun May 11, 2014 9:20 am

Re: Pattern Parameters

Postby Anti » Wed Jul 02, 2014 3:59 pm

MagWeb wrote:Against the number of calculated points the overall accuracy of the surface rises with a higher number of patterns as long as your system (projector and cam) can output/grab finer patterns.
Keep in mind that higher accuracy is only useful if the scanned surface needs this overall accuracy (e.g. if there are small details you need to grab), your calibration is good enough and your final fusion settings keep those details as well.


Has someone done a test or is there a way to calculate the difference in accuracy between these parameter settings? Thanks in advance ...
Anti
 
Posts: 55
Joined: Sun May 11, 2014 9:20 am


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