Processing xvimagesink video output

[hrbaty]

Hi.

I have a question. Is there a easy way to determine a position of an image in the video output of i.e xvimagesink?

Lets say that I have detected an edge of a shape and I would like to determine its position (in pixels).
I know that a complex problem, but I appreciate any tips on where to start.

Thanks

[Stefan Sauer]

On 07/28/11 10:07, hrbaty wrote:
> Hi.
>
> I have a question. Is there a easy way to determine a position of an image
> in the video output of i.e xvimagesink?
>
> Lets say that I have detected an edge of a shape and I would like to
> determine its position (in pixels).
Well, if *you* have detected it, your should know where?
> I know that a complex problem, but I appreciate any tips on where to start.

Honestly, your question makes not a lot of sense. Do you want to run
some feature detection in the video streaming and output the positions
of the found features. That's possible. Look at
gst-plugins-bad/ext/opencv/ which has such elements.

Stefan

> Thanks
>
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/Processing-xvimagesink-video-output-tp3700723p3700723.html
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[hrbaty]

Ok, thanks for the answer. Maybe my question was unclear, but I'm getting to right track now.
One more thing. I installed gst-plugins-bad, where opencv plugin supposed to be added.
All files compiled and installed smoothly:
..
Making install in opencv
make[2]: Entering directory `<blabla>/gst-plugins-bad-0.10.22/ext/opencv'
make[3]: Entering directory `<blabla>/gst-plugins-bad-0.10.22/ext/opencv'
make[3]: Nothing to be done for `install-exec-am'.
test -z "/usr/local/lib/gstreamer-0.10" || /bin/mkdir -p "/usr/local/lib/gstreamer-0.10"
 /bin/bash ../../libtool   --mode=install /usr/bin/install -c   libgstopencv.la '/usr/local/lib/gstreamer-0.10'
libtool: install: /usr/bin/install -c .libs/libgstopencv.so /usr/local/lib/gstreamer-0.10/libgstopencv.so
libtool: install: /usr/bin/install -c .libs/libgstopencv.lai /usr/local/lib/gstreamer-0.10/libgstopencv.la
libtool: install: /usr/bin/install -c .libs/libgstopencv.a /usr/local/lib/gstreamer-0.10/libgstopencv.a
libtool: install: chmod 644 /usr/local/lib/gstreamer-0.10/libgstopencv.a
libtool: install: ranlib /usr/local/lib/gstreamer-0.10/libgstopencv.a
libtool: finish: PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin:/sbin" ldconfig -n /usr/local/lib/gstreamer-0.10

but gst-inspect-0.10 --plugin opencv shows " No such element or plugin 'opencv' "
gst-inspect-0.10 edgedetect -> No such element or plugin 'edgedetect', etc.

All plugins from gst-plugins-bad were installed except opencv...

Any clues??

BR

[Stefan Sauer]

On 07/28/11 16:15, hrbaty wrote:

> Ok, thanks for the answer. Maybe my question was unclear, but I'm getting to
> right track now.
> One more thing. I installed gst-plugins-bad, where opencv plugin supposed to
> be added.
> All files compiled and installed smoothly:
> ..
> Making install in opencv
> make[2]: Entering directory `<blabla>/gst-plugins-bad-0.10.22/ext/opencv'
> make[3]: Entering directory `<blabla>/gst-plugins-bad-0.10.22/ext/opencv'
> make[3]: Nothing to be done for `install-exec-am'.
> test -z "/usr/local/lib/gstreamer-0.10" || /bin/mkdir -p
> "/usr/local/lib/gstreamer-0.10"
>  /bin/bash ../../libtool   --mode=install /usr/bin/install -c  
> libgstopencv.la '/usr/local/lib/gstreamer-0.10'
> libtool: install: /usr/bin/install -c .libs/libgstopencv.so
> /usr/local/lib/gstreamer-0.10/libgstopencv.so
> libtool: install: /usr/bin/install -c .libs/libgstopencv.lai
> /usr/local/lib/gstreamer-0.10/libgstopencv.la
> libtool: install: /usr/bin/install -c .libs/libgstopencv.a
> /usr/local/lib/gstreamer-0.10/libgstopencv.a
> libtool: install: chmod 644 /usr/local/lib/gstreamer-0.10/libgstopencv.a
> libtool: install: ranlib /usr/local/lib/gstreamer-0.10/libgstopencv.a
> libtool: finish:
> PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin:/sbin"
> ldconfig -n /usr/local/lib/gstreamer-0.10
>

You are installing to /usr/local and not /usr, thus you need to be
careful to nix mix stuff with your distro and export environment
variables such as LD_LIBRARY_PATH and GST_PLUGIN_PATH to use the right
gstreamer installation. You can also run gstreamer uninstalled (if you
have all the source packages in the same subdir.

Stefan

> but gst-inspect-0.10 --plugin opencv shows " No such element or plugin
> 'opencv' "
> gst-inspect-0.10 edgedetect -> No such element or plugin 'edgedetect', etc.
>
> All plugins from gst-plugins-bad were installed except opencv...
>
> Any clues??
>
> BR
>
>
>
>
>
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/Processing-xvimagesink-video-output-tp3700723p3701432.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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