Analysis of camera positions and alignment process

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  • Avatar
    Michal Rus

    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,

  • Avatar
    Götz Echtenacher

    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.

     

  • Avatar
    Tom Foster

    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

  • Avatar
    Götz Echtenacher

    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...   ;-)

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