[Digikam-devel] [Bug 170458] New: object position on pictures

[flamboyant]

http://bugs.kde.org/show_bug.cgi?id=170458

           Summary: object position on pictures
           Product: digikam
           Version: unspecified
          Platform: unspecified
        OS/Version: unspecified
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel at kde.org
        ReportedBy: rustahm at yahoo.com


Version:           0.10 (using KDE 4.0.5)
Installed from:    Unspecified

in anticipation of digiKam 0.10 supporting XMP, i'd like to propose a new
feature that will enable users to add more value to their images.
currently available metadata formats allow us to assign keywords to an image. i
believe it's a good practice to name objects captured in a shot as keywords.
however, in many cases just naming them is not enough. please take a look at
this picture, for instance:
http://farm4.static.flickr.com/3141/2749777162_60a5d02599_b_d.jpg. let's
suppose this image has "Gilles Caulier" among its keywords. how are we supposed
to find Gilles on the picture if we don't know him by sight? even if you're a
good friend of him it'll take you quite a while to pinpoint Gilles' face in
this crowd, and a positive result of the search is not guaranteed. so, why not
make use of XMP and let users embed such data into new properties of existing
XMP schemas or into a new XMP schema?
one of possible solutions is to add details of a square that can point to a
certain area of an image to any object on the picture, like this:
http://www.geocities.com/rustahm/images/P5230296.JPG. these details can be
embedded as XMP metadata as per this data diagram:
http://www.geocities.com/rustahm/images/diagram.pdf, where ns is a new
namespace [or an existing one], ns:object is an unordered array of stuctures,
ns:position is a structure containing details of a square: coordinates of the
left bottom corner [ns:x and ns:y] and length of its side [ns:sideLength].
this solution might be bad, but i hope it gave you the notion of my idea. once
an image has this metadata, digiKam [or any other application] can use it to
point to the area where the object is, if the user toggles the name of the
object.


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