[Digikam-users] Area in focus

[Anders Lund]

Torsdag den 1. oktober 2015 11:11:09 skrev Gilles Caulier:
> We have 2 entries in bugzilla about this topic to look which area have been
> focused while shot. The first deal is to read metadata where camera store
> this information. This way is fast.
> 
> https://bugs.kde.org/show_bug.cgi?id=138704
> 
> There is another entry which require a different approach : analysis the
> content of image to see where are the most focused pixels. This way is used
> in Darktable. This way is slow of course because whole pixels images must
> be parsed.

The image data probably contains the focus point(s) active, but in case of 
recomposing they may not point to the actual focused area, which favors the 
slower analysis. Nice to have, though :)

> 
> https://bugs.kde.org/show_bug.cgi?id=314022
> 
> As we have already an algorithm to detect blur image, the second point will
> be easy to implement i think. For the first one, Exiv2 must be patched to
> decode camera marker-notes relevant of focus point. As each camera maker
> use a different approach, this will be complex. Note : these information
> are stored in private Exif area and of course are not documented.
> 
> Both way can be proposed for students next summer...
> 
> Gilles Caulier
> 
> 2015-10-01 10:52 GMT+02:00 Marie-Noëlle Augendre <mnaugendre at gmail.com>:
> > I think darktable has something like that (I use the program, but not this
> > functionality), but it works with RAW pictures only.
> > 
> > Marie-Noëlle
> > 
> > 2015-10-01 10:42 GMT+02:00 B. M. <b-misc at gmx.ch>:
> >> Dear all,
> >> 
> >> I wonder if it's possible to automatically detect (and maybe mark) the
> >> area which is reasonably well in focus of an image, with digikam or maybe
> >> with other tools. Any ideas?
> >> 
> >> Thank you for your inputs.
> >> B.M.
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