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Control Points

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KHM3dia

Hi All,

Lately i've been trying to wrap my head around Control points and how you can marge multiple components into 1 but for the life of me I cant figure out how they work. I watched the tutorial provided by RC on YT but I cant seem to get the same results as the YT video. 

So far I get lets say 2 components, I add a few control points from matching images to align them but clicking update or align they still stay the same. Im most likely doing something fundamentally wrong but was hoping someone could give any more information.

 

Thanks

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7 comments

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  • Avatar
    Wallace Wainhouse CR

    Hi Stefan,

    Have you made at least 3 control points and confirmed them on at least 3 images in both components? (this is absolute bare minimum). If so what kind or error range are you getting on the control points? Also which videos have you watched so far, maybe I can point you towards some more.

  • Avatar
    KHM3dia

    Hi Wallace, ahh I wasnt aware I had to put the same amount and same place in both control points in my case. Regarding the error range im not entirely sure what that is so wouldnt be able to give a right reply. The video I watched was this.

  • Avatar
    Wallace Wainhouse CR

    Hi Stefan,

    Essentially when you make a control point you are telling the software "hey this thing in this image is exactly the same thing as this thing in this other image, and also this same thing in this image"

    in the image above, the position where i confirmed "dsc05120.jpg" to be is 0.1 of a pixel different from where RC thought it was, this is actually called the image-measurement deviation not error range is i referred to it.

    Try this video https://youtu.be/ZZut6f17Vtc

  • Avatar
    KHM3dia

    Hi Wallace, 

    So to be clear I need to make x3 identical control points in both components?

  • Avatar
    Wallace Wainhouse CR

    Hi Stefan,

                 No 3 completely different features ideally in a triangle not a line (at least 3, you'll need a lot more in a big scene). And each point needs to be aligned to at least 3 images in each component.

    do this for all 3 control points. But there is no golden rule for how many control points and how many images in each one you would need to get them to merge.

  • Avatar
    KHM3dia

    Hi Wallace, 

    I think I understand what you mean but hopefully the video will help make it more clear.

  • Avatar
    Wallace Wainhouse CR

    Hi Stefan,

                 Let me know if you have any more trouble with it. It can be a bit tricky at first, but once you have done it once it's quite easy unless you have a really bad dataset.

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