Analysis of camera positions and alignment process

Development Asset Creation
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1

Hi guys
What I would love to know more about is how the experts analyse the alignment

  • find out what photos where not taken into consideration and why
  • what photos are ‚Strong‘ and wich are week (maybe should be left out rather)
  • examine where some more pictures would improve geometry or textures

Does that make sense ?
Best
Heiko

2

Dear Heiko,

try Aligment > Inspect tool to find out more.

More info can be found here:

https://support.capturingreality.com/hc/en-us/articles/115001552532-Quality-assessment

http://janebeecr.blogspot.sk/2017/04/how-to-never-miss-spot-again-with.html

Best Regards,

3

Yes, the inspection tool is very good to see if everything is connected well.

Another indicator I look for is the density of the sparse point cloud and also the sharpness of the surface.

You’ll get quicker after a while and get a feeling for difficult spots.

Weak images you can find by looking at the number of features, but in general I would use all of them, even blurry ones.

 

4

Everyone thinks Inspect is wonderful, and I expect it is, but what does it actually do? Like so much geek-written Help, blogs etc, only makes sense if you already understand it, baffling to newbies. Terminology unexplained, explanations ambiguous, circular, leaving out vital bits.

First, the red>blue spectrum - which is ‘good’? I think blue but documentation and official RC advice here contradict ea other.

Then, what do the Inspection tool Settings parameters mean?

Connectivity vs Feature consistency - means what, what’s the difference? Refers to interconnected sets? (duplicate use of the word ‘component’?)

And are these parameters filters, excluding anything below the number set?

Matches count presumably isn’t a filter - or is it?

Minimal vs Maximal matches - are these filters, ‘Minimal’ excluding anything below, ‘Maximal’ anything above the number set? What is excluded - points, cameras, or coloured links?

Apical angle? unexplained anywhere. If it’s a filter, is it ‘maximal’ or ‘minimal’? If it’s the 3D angle between any two camera axes, why is that a relevant gauge of alignment quality? Should apical angle be low, high or middling?

Show edges - means what? Internal vs External - eh?

Analyze selection - I can guess but wd like explanation

5

Hi Tom,

I think your in-depth questions go too far off topic.

Just this: red is more = better. No connection is worse ( but not neccessarily a lost cause either).

I tried around with the settings a bit in the past but for most purposes, the standard is perfectly sufficient.

It’s only there for a rough overview - you cannot calculate the quality of each camera from it (at least I dunno how).

You don’t need to know how a silicon chip is constructed in order to use a computer…   :wink: