RegionInfo for faces . X and Y = TopLeft or Center position

[berliner_ffm]

I am a bit confused about the X and Y-Fields of the area-struct within RegionInfo.
I thought this would be the Top-left-position of the face found in an image, so that the rectangle around the face would be:
(X,Y,X+W,Y+H) (all values in percentage of the image)

However it seems to me as if Lightroom would use X and Y as the centerpoint of the image, making the rectangle
(Y-W/2,Y-H/2,X+W/2,Y+W/2)

Is X & Y indeed the center of the face? Thanks for your help!

[Phil Harvey]

Are you talking about the Microsoft RegionInfo, or the MWG RegionInfo?

Microsoft defines x/y as upper/left, while MWG defines it as center.  (This makes perfect sense since Microsoft is part of the MWG group, and they always do their best to keep programmers guessing.)

I didn't remember this offhand, and it took me about 20 minutes to look up the relevant specifications to be able to answer this question.

- Phil

[berliner_ffm]

Thank you Phil, I appreciate your time! The more you drive into metadata, the more it becomes a mess I guess.