initial experiences - some remarks

[GoogleCodeExporter]

I tried to find contact information for the project, but this form is the
only thing I've found.

I just tried out your project, and I'm very excited to see it! after
experimenting with the face detection part, and your samples, I had the
following experiences / thoughs:

- if one moves his had too fast, because the web camera blurs the image,
face tracking is confused for the duration of the movement. after one stops
the head movement, it re-captures the face.

I wonder - one might be able to predict the vector of movement for the
uncertain period, and use that info in the meantime?

- if one moves his head out of the camera's view, basically the face
detection is gone forever. even if one moves back his head, the reference
points are gone

in such cases, auto re-initialization might help, basically entering a
state of actively looking for a face?

- looking the application working, basically I found that the number of
reference points is always decreasing - some are lost with time, but no new
ones are picked up.

maybe looking for new reference points while running would be of help?

- if one turns his head left or right (not facing the camera, but looking
to the side), head recognition is lost. maybe a prediction could be used in
these cases as well? or maybe adaptive tracking could be used - basically
re-calibrating the features for the same region, and sort of 'accepting the
fact' that the visuals of the face have changed?

basically I'm trying to think of improving the tracking nature of the solution.

(I'm doing all this with a Linux laptop and a Logitech webcam using the UVC
driver)

Original issue reported on code.google.com by maroy.akos@gmail.com on 18 Jan 2009 at 8:54

[GoogleCodeExporter]

Hi Maroy,

I agree with you in lots of points. Sorry for not replying earlier (I just 
didn't
receive the issue tracking e-mail for some reason).
Most of the ideas you've given are being implemented in the SVN tree but they 
are
still not finished, so, probably in the next release a lot of what you said 
might be
already working. 

Thanks for sharing your points

Original comment by danielba...@gmail.com on 28 Feb 2009 at 11:58

[GoogleCodeExporter]

Hello,

First of all congratulation for all the work you've done.
I've built the demo and the above issues are still there. How could we make it 
more robust?

Thanks and regards,

Original comment by agaric.p...@gmail.com on 15 Jan 2011 at 8:56

[GoogleCodeExporter]

Hi Agaric Perdereau,
we are working on a version based on Active Appearance Models. I believe it 
will be way more robust, but it is still going to take a while.

Best regards,
Daniel

Original comment by danielba...@gmail.com on 15 Jan 2011 at 11:34

[GoogleCodeExporter]

Hi,
i am a final year BE student. i am working on the ehci-0.6 library for tracking 
the the face in fedora 13 in vmware. i am able to compile the code but couldnot 
run the sample programs.i am facing the same program as posted by u.The error s 
as follows
 After I compile the program
cd ehci-0.6
./configure
make
I am able to do the above with out any errors. Later when try running samples
I am getting the below errors
cd samples 
make
./simple2d

(<unknown>:5940): GStreamer-CRITICAL **:
Trying to dispose element appsink1, but it is in READY instead of the NULL 
state.
You need to explicitly set elements to the NULL state before
dropping the final reference, to allow them to clean up.
This problem may also be caused by a refcounting bug in the
application or some element.

(<unknown>:5940): GStreamer-CRITICAL **:
Trying to dispose element ffmpegcsp1, but it is in READY instead of the NULL 
state.
You need to explicitly set elements to the NULL state before
dropping the final reference, to allow them to clean up.
This problem may also be caused by a refcounting bug in the
application or some element.

OpenCV Error: Unspecified error (unicap: failed to get info for device
) in CvCapture_Unicap::initDevice, file 
/builddir/build/BUILD/OpenCV-2.0.0/src/highgui/cvcap_unicap.cpp, line 139
terminate called after throwing an instance of 'cv::Exception'
Aborted (core dumped)

and but ven tried using  
./samples/simple2d 
the error i am facing is "couldnot initialise tha capturing"
can u please suggest me to overcome this kind of error.
blank window opens and goes on showing the error mentioned above and ends ven 
given ctrl + c.
the expected output to open a window and display the capture the person present 
in front of the webcam and print d coordinates of the face captured

If you need further more details I can provide you regarding the project and 
error.
Thanking you
niveditha

Original comment by nivea...@gmail.com on 19 Mar 2011 at 1:14

[GoogleCodeExporter]

Hi niveditha,
thank you for your report. Sounds like your camera isn't working inside VMWare.
First thing I would do is download OpenCV (yum install opencv, or something 
like that) go to the samples folder and run some facedetect or camshift... If 
it doesn't acquire frames, the problem is probably related to VMWare camera... 
If it goes like this, I'd ask for some help in OpenCV forums.
Please, tell us what happened =)
Best regards,
Daniel

Original comment by danielba...@gmail.com on 20 Mar 2011 at 2:50