Dmitry Brant, 10/11/2014 04:41:

Just throwing this out there:
Would it be possible to have a script that crawls through images on
Commons, detects faces in the images, and embeds the x,y position of the
face(s) into the File page of the image (or into the Exif data of the
image)

We have https://commons.wikimedia.org/wiki/Commons:Image_annotations . If you can do this programmatically and reliably, you should make a bot and ask authorisation to run it over all images: https://commons.wikimedia.org/wiki/Commons:Bots/Requests

(and makes this information available via the API)?

You could, say, make some parser function in the CommonsMetadata extension to expose in the API the data (format) we already have. Or just make the PageImages extension alter the thumbnail it exposes, and use that one.

For a little context -- in our mobile apps, we'll be featuring images
related to the article that the user is browsing;

Why? Featuring as in showing outside normal places? Related as in not included in the article?

I don't yet understand what you're up to here, but the obvious and standard way to do something like this would be fixing https://bugzilla.wikimedia.org/show_bug.cgi?id=7757 and use cropped images only when considered appropriate by the article authors.

Nemo

however, the way that
we're cropping the images sometimes has the side effect of cropping out
the face of the subject (when the face is far from the center of the
image).  Even though we can do face detection locally on the user's
device, it can be a bit slow and a bit intensive.  It would be great if
this task was offloaded, and the face position was returned right along
with the image itself...

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