I'm working on a project and wanted to use the web API to
automatically detect faces in photos. I was hoping I'd be able to pre-
train Picasa Web Albums to know what a certain set of people look like
and then use the Web API to guess who people are in new photos,
uploaded, queried for face detection, then examined for the results.

The more I look through the Web API, the less promising it looks.

a) I don't think Web Albums API learns faces or makes guesses the way
the desktop Picasa software does nor does it have an executable
function for "guessFaces()" or similar
b) I'm not even sure the Web API has a function for retrieving who is
tagged in a certain photo even when they are definitively tagged
manually, and although I find it hard to believe the Web API wouldn't
return a feed with a structure similar to the following pseudocode to
accommodate that...

<photo>
... photo data...
<facetag>
... rectangle parameters...
... person tagged...
</facetag>
... more facetags...
</photo>

... I'm not finding it.

So two questions:

1. Am I incorrect with either (a) or (b) above?
2. If I'm correct about being unable to do face recognition via the
Web API, does the desktop software have its own API for accessing its
face recognition routines?

Thanks in advance. And thanks to the engineers who work on Picasa.
Very cool stuff.

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