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 >
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