Unit and convention of PrincipalPointU and PrincipalPointV

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    Zuzana Ďuríčková CR

    Hello Etienne,

    PrincipalPointU and PrincipalPointV in the exported XMP file are the relative offsets from the center of an image in x axis and y axis respectively. Principal point x and Principal point y in the application are offsets from the center of an image in [mm] w.r.t. 35 mm film format. Simply said, the values in the XMP file are the values in the application divided by 35 mm. Therefore, these values are dimensionless. 

    You are right about the description in the application, we will change that to make it clear.

     

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    Götz Echtenacher

    Hi Etienne,

    can you elaborate please what you are looking at or where you get the info.

    In the calibration report there's only x and y and it says [mm]...

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    Etienne

    Oh, I should have mentioned that I am looking at the values in the XMP file exported from RealityCapture. The values that appear there for the Principal point are different from the ones we see in the UI.

     

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    Götz Echtenacher

    Ah, that's different then...  :-)

    But I'm afraid I can't help you there.

    Off topic: How did you change your avatar?

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    Etienne

    For the avatar, register at http://en.gravatar.com/ with the same email address.

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    Götz Echtenacher

    Ah, cheers!

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