Hey I am using Fedora where it works, not Ubuntu, but it seems like frei0r-plugins is pulling in an incomplete opencv package. see https://bugs.launchpad.net/ubuntu/+source/opencv/+bug/459940
The workaround they suggest is to remove frei0r-plugins which is not an option since you need it. Try installing libcv-dev since it contains the missing file. Cheers, Eitan. 2011/1/4 Helios <helio...@gmail.com> > Ok, > I got that GUI and also: > > pe...@hp550:/home/psychopetra/Plocha$ gstreamer-properties > gstreamer-properties-Message: Skipping unavailable plugin 'artsdsink' > gstreamer-properties-Message: Skipping unavailable plugin 'esdsink' > gstreamer-properties-Message: Skipping unavailable plugin 'glimagesink' > gstreamer-properties-Message: Skipping unavailable plugin 'sdlvideosink' > gstreamer-properties-Message: Skipping unavailable plugin 'v4lmjpegsrc' > gstreamer-properties-Message: Skipping unavailable plugin 'qcamsrc' > gstreamer-properties-Message: Skipping unavailable plugin 'esdmon' > pe...@hp550:/home/psychopetra/Plocha$ > > And all looks to be OK, testing also works. However, the problem remains: > > pe...@hp550:/home/psychopetra/Plocha$ gst-launch-0.10 autovideosrc ! > ffmpegcolorspace ! frei0r-filter-bw0r ! > ERROR: Could not load classifier cascade > /usr/share/opencv/haarcascades/haarcascade_frontalface_alt2.xml > VAROVÁNÍ: chybná roura: propojení bez elementu spotřebiče > pe...@hp550:/home/psychopetra/Plocha$ > > I added some screenshots so maybe there is somewhere incorrectly set. > > Helios > > > > 2011/1/4 Eitan Isaacson <ei...@monotonous.org>: > > Looks like your webcam is not automatically getting picked up by > gstreamer. > > run gstreamer-properties (in Ubuntu it's in the gnome-media package), and > > make sure the video default input works, or configure it appropriately. > > > > 2011/1/4 Helios <helio...@gmail.com> > >> > >> Hi Eitan, > >> I am not sure if I did all correctly but.... I installed frei0r-filter > >> (first I googled a little to find out what is it) from Ubuntu > >> repository, but when I tried the supplied command, I got this output: > >> > >> pe...@hp550:/home/psychopetra/Plocha$ gst-launch-0.10 autovideosrc ! > >> ffmpegcolorspace ! frei0r-filter-bw0r ! > >> ERROR: Could not load classifier cascade > >> /usr/share/opencv/haarcascades/haarcascade_frontalface_alt2.xml > >> ERROR: Could not load classifier cascade > >> /usr/share/opencv/haarcascades/haarcascade_frontalface_alt2.xml > >> VAROVÁNÍ: chybná roura: propojení bez elementu spotřebiče > >> pe...@hp550:/home/psychopetra/Plocha$ > >> > >> It is in Czech - the last but one row means something like "Warning: > >> incorrect pipe: connection without device element > >> > >> I tried to install python-opencv, but I again got this: > >> > >> E: yaml-mode: podproces instalovaný post-installation skript vrátil > >> chybový status 1 > >> (subprocess installed post-installation skrict returned error status 1) > >> > >> Helios > >> > >> Vinux 3.0 (Ubuntu Lucid, Kernel 2.6.32-27-generic), Gnome 2.30.2, > >> HP550 laptop: Intel Celeron, 1GB ram, Intel graphics > >> > >> 2011/1/4 Eitan Isaacson <ei...@monotonous.org>: > >> > On Sat, Jan 1, 2011 at 1:56 PM, Helios <helio...@gmail.com> wrote: > >> >> > >> >> Hi, > >> >> we are just testing a standard webcam to be used as a digital > >> >> magnifier for visually impaired users. Such gadget could be very > >> >> useful, as many low vision users need such device, but those > >> >> commercially available are Windows only and mostly very expensive. > >> >> We tested common Genius webcam with manual focus feature using > Cheese, > >> >> however, there are no features needed for this kind of users > (supplied > >> >> by my visually impaired sister): > >> >> - inverse color mode > >> > > >> > > >> > gst-launch-0.10 autovideosrc ! ffmpegcolorspace ! frei0r-filter-bw0r ! > >> > frei0r-filter-invert0r ! ffmpegcolorspace ! autovideosink > >> >> > >> >> - color profiles (eg. yellow text on blue background - simple runs in > >> >> BW mode only and replaces black with yellow and white with blue) > >> > > >> > > >> > gst-launch-0.10 autovideosrc ! ffmpegcolorspace ! > >> > frei0r-filter-contrast0r > >> > contrast=0.7 ! frei0r-filter-bw0r ! frei0r-filter-invert0r ! > >> > frei0r-filter-levels white-output=0.06 black-output=0.27 channel=2 ! > >> > ffmpegcolorspace ! autovideosink > >> >> > >> >> - guiding lines (can provide some screenshots) > >> > > >> > There should be an easy way of doing that. > >> > > >> >> > >> >> - and some others > >> >> > >> > > >> > The options are limitless! And it would be fun to create a simple UI > for > >> > all > >> > that. > >> > >> > >> > >> -- > >> S pozdravem > >> > >> Helios > > > > > > > > -- > S pozdravem > > Helios >
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