Partial Alignment

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8 comments

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    Wishgranter
    Hi Jo
    It is mostly related to proper image overlap among images. try getting more overlap into your scene and then you can align it on the first run...
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    Anonymous
    Hi Wishgranter,

    thanks for the answer. I guess I missformulated my question. What I really wanted to know: What happens in a second pass that didn't already happen in the first one, if I don't change any parameters? Also, for some reason, sometimes the procedure just stops without even considering (i.e. extracting key points, matching) all images.

    Cheers,
    Jo
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    Wishgranter
    Hi Jo
    It depends on many factors, can you post your ALIGNMENT settings ?
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    Anonymous
    Hi Milos,

    I pretty much keep the default settings but usually set the image overlapp to high (as I have a pretty high overlap) and sometimes provide a prior focal lenght estimation. The problem seems to be that at one point it just stops extracting tie points for the images (and therefore also skips the rest of the procedure). The images where the tie points are detected are consecutive, but not necessarily at the beginning or the end of the imput images.

    Cheers,
    Jo
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    Anonymous
    P.S.: In the second run of "Align Images" it usually does all of them!
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    Wishgranter
    Hi Jo
    Change it to LOW overlap and run it from scratch :D

    LOW -> will try to use the whole image
    MEDIUM -> medium...
    HIGH -> only the "central" part of an image is used

    These settings are here because it is not always good to use the whole image space because in most cases the "outer" part of images is of lower quality ( vignetting, blur, etc. ) that is why we use MEDIUM as the default... it is about experience to know when to set different settings as the default ones..
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    Anonymous
    Hi Milos,

    unfortunately this doesn't help with the issue, it took 3 runs to include all images. I don't mind running the procedure multiple times, I just don't understand why no key points are detected at all for the remaining images.

    Cheers,
    Jo

    P.S.: In general, I really like your tool!
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    Anonymous
    Hi again,

    could you maybe elaborate what exactly happens when alignment is performed multiple times. Because even if there is already a result that used all images, a successive run yields different (sometimes better, sometimes worse) results.

    Cheers,
    Jo
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