UIImageView vs. Image

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i wondering whether might able point me in right direction or provide me ideas on how approach problem.

relationship between dimensions , coordinates of uiimageview , image user captures. example, if draw rectangle around physical object user sees on uiimageview using users rear camera, , let's assume user takes photo, how x,y coordinates , dimensions of rectangle compare actual image taken. possible replicate exact dimensions , coordinates of rectangle drawn on uiimageview on actual image taken phone?

apologize in advance if sounds confusing. :)
 



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