[Digikam-devel] libkface

[Gilles Caulier]

Tobias,

With my commit http://commits.kde.org/libkface/dc0ac7b44c11a798543de7515ccc49190ea03086

I restored Recognition feature in KFaceGUI test program. Take a look,
in fact it simple to handle.

It miss again training feature to update database.

Gilles Caulier

2014-06-25 14:40 GMT+02:00 Gilles Caulier <caulier.gilles at gmail.com>:
> 2014-06-25 13:50 GMT+02:00 Tobias Leupold <tobias.leupold at web.de>:
>> Gilles,
>>
>> I have a few comments on
>> https://projects.kde.org/projects/extragear/libs/libkface/repository/revisions/master/entry/DESIGN
>>
>>> Faces database file is hosted in home directory to be shared with all
>>> applications which use libkface :
>>
>> I don't think that's always the case; at least the recognize program in test/
>> does not use this path, but the current work dir to store the db.
>
> absolutely. An improvement can be to add a new CLI argument to adjust
> database path.
>
>>
>> And speaking generally of test/:
>>
>> The recognize tool works fine. As said, I was able to implement face detection
>> using libkface with a few lines of code after having had a look at the
>> sources.
>>
>> But I had to change all calls of kDebug() to qDebug(); kDebug() didn't produce
>> any output here (im very new to programming C++/Qt/KDE, so perhaps, this is my
>> fault; but it's quite confusing if the program doesn't speak). Same for the
>> recognize program.
>
> run kdebugdialog and turn on KFace debug space to print trace on the
> console. No need to use qDebug() instead
>
>>
>>> KFaceGui is a simple application able to run detection and recognition
>>> without to use CLI. Currently detection is implemented and recognition is
>>> broken.
>>
>> The GUI in test/gui/ is (in contrast to the code in test/) not compiled when
>> building libkface. I think it would be nice if at least a README would be
>> placed here with how to do it. It would also ne nice if recognition was fixed
>> here, so that on has an example of how to do it.
>
> It compile if you turn on -DKDE4_BUILD_TESTS=ON cmake flag at
> configuration time.
>
>>
>> And ... what's the general state of the library? When I tried to use it, I
>> thought it's ready-to-use ...
>
> i pass a lots of time to review code in library since few weeks and i
> can said that implementation is better now (git/master). Crashes are
> now fixed, but it still memory leak with database (Qt4-sqlite plugin
> relevant).
>
>>
>> The face detection works fine, but does it work better than using OpenCV's
>> CascadeClassifier directly (cf. the small Python program I posted in
>> https://bugs.kde.org/show_bug.cgi?id=292900 )? Where's the difference? I think
>> this should be documented, as you surely put some effort into this, and
>> there's some good reason to use libkface.
>
> No idea, never tested. perhaps Marcel can respond better than me here.
> He has large experience about libkface as he has follow students who
> work on it in the past.
>
> In all case FaceDetection give excelent results with digiKam. Over
> 20000 face detected, only few are false (around 30-40)
>
>>
>> And what about the recognition feature? Just speaking for me, I wasn't able to
>> use it yet. What about the align and preprocess tools? What do I have to do to
>> be able to use it?
>
> No idea. Process work but i seen only few real recognition here.
>
>>
>> I thought of the library like "give it some faces to learn" and "give it the
>> face part of a photo, get a person suggestion". Is this "high-level" access
>> possible? It would be really fine if the library cared about alignment and
>> preprocessing so nothing can go wrong.
>
> Here Marcel can respond better than me.
>
>>
>> I would really like to use it or even contribute to this library. There's
>> surely a need for a good OSS face detection and recognition tool. I think
>> everything would be way easier if all that was documented somewhere. Like some
>> "This is what we have right now and this is what we can do with it". With some
>> minimalistic clear and working example code.
>
> Yes, please help is welcome. As API doc improvements, CLI test tool
> (for ex recognition part of KFaceGUI need to be ported on new libkface
> API)
>
> Don't hesitate to contribute, it will be welcome...
>
> Gilles Caulier
>
>>
>> At the moment, apart from the detection feature, It's quite hard to know
>> what's going on and how to use it ...
>>
>> Yours, Tobias
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