M4/3 camera alignment issues

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    Wishgranter
    Hi KristofR

    Are you using default settings for alignment ? if not please post them here

    And please try set settings like here, then remove existing COMPONENTS and keep only largest one and use ALIGN to see if it helps.

    ALIGNMENT_80_40k_brownTT.png
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    kristof93
    Thanks for the advice! I was using default settings and looks like it works with these changes. I used K+Brown4 with tangential 2 though, just to make sure.

    Still have a couple of questions: would using the sensor stabilisation negatively effect the alignment/reconstruction?
    Also, mft cameras have automatic lens correction applied to the raw, and the lenses are designed with this in mind. Would disabling it help, or make it worse?

    Kristóf
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    Wishgranter
    Hi KristofR

    Thanks for the advice! I was using default settings and looks like it works with these changes. I used K+Brown4 with tangential 2 though, just to make sure.


    If you use "small" sensors then its advisable to use these settings for distortion as the sensor and lenses have many optical issues so its advisable to use these settings. ( Brown4 - 4 params of distortion are calculated )

    Still have a couple of questions: would using the sensor stabilization negatively effect the alignment/reconstruction?
    Also, mft cameras have automatic lens correction applied to the raw, and the lenses are designed with this in mind. Would disabling it help, or make it worse?


    Sensor stabilization have minimal impact on alignment / recon. It can cause issues if the "shaking" of the camera get over certain treshold, but frankly that are cases of very strong UAV movement and stabilization issues. In general its not a issue as i say.

    Lens corrections, in principle I am against in-camera corrections as they are not so precise ( onboard CPU processing power + used algos ) and they are ok for photographer or videographer use cases but not so much for photogrammetry.
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    kristof93
    Thanks! All working ok now, and I only need to fire up PS for the most problematic scans, with insufficient images and overlap.

    Kristóf
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    Götz Echtenacher
    Wishgranter, could you elaborate on what you mean by " "small" " ?
    Surely M43 is not the tiniest size...

    And about the different distortion models:
    Do the higher Brown numbers only mean longer processing time or can it also screw up an alignment?

    @all:
    Does anyone know a good (especially simple) intro the subject of distortion models?
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