My use case would be to show my book's barcode in front of the webcam and provide automatically the ISBN (EAN) to gcstar and launch search. This would permit to enter my library a bit faster ;-)

Some tools that recognize barcode using a webcam java, no doc to launch it o_O (check wiki though) good spirit :-) and using ffmpeg

The option pgmpipe was not working as not implemented in default ffmpeg on Mageia 1, see
hmmm pgmpipe not by default either :/ (new name for zebra) qt4 & gtk UI available apparently

Using gcstar

See CompileGcstar
I'd like to use:
nc -vv -l -p 50007
listening on [any] 50007 ... inverse host lookup failed: Unknown host
connect to [] from (UNKNOWN) [] 43588
<scans><scan format='EAN_13'>3780193006955</scan></scans>
<scans><scan format='EAN_13'>9782290307274</scan></scans>
<scans><scan format='EAN_13'>9782070403974</scan></scans>
^C sent 0, rcvd 174 in python on android

Using JLinBar

tar xvf v4l4j-0.8.10.tar.gz
cd v4l4j-0.8.10
export JDK_HOME=/usr/lib/jvm/java-1.6.0-openjdk
ant all
sudo ant install
ant test-gui
ant deviceInfo
cd ../zxing/
ant -f core/build.xml
ant -f javase/build.xml
java -cp javase/javase.jar:core/core.jar ../UPC_A.png
file:/home/baud/Development/scanner_codebarre/zxing/../UPC_A.png (format: UPC_A, type: PRODUCT):
Raw result:
Parsed result:
Found 2 result points.
  Point 0: (51.5,240.0)
  Point 1: (623.5,240.0)
java -Djava.library.path=/usr/lib/jni -cp /usr/share/java/v4l4j.jar -jar jlinbar.jar
Exception in thread "main" java.lang.NoClassDefFoundError: au/edu/jcu/v4l4j/FrameGrabber
Caused by: java.lang.ClassNotFoundException:
	at Method)
	at java.lang.ClassLoader.loadClass(
	at sun.misc.Launcher$AppClassLoader.loadClass(
	at java.lang.ClassLoader.loadClass(
Could not find the main class: net.planewalk.apollon.jlinbar.JLinBar. Program will exit.

Using vgrabbj and gocr for barcode decoding and
$ vgrabbj -d /dev/video -o ppm | gocr -

what worked for me :
$ vgrabbj -d /dev/video0 -o ppm | gocr -

well, disappointingly I keep having
<barcode type="unknown" /><barcode type="unknown" />

vgrabbj -d /dev/video2 -i vga -o ppm -f essaivga2.ppm -l 1 # will launch vgrabbj as a deamon and take an image every second, re-writing the file
display # will show the image (have to tweak to be displayed whenever it changes, or perhaps does it automatically)

you can use the option sxga for 1280x1024 instead of vga

Other ocr tools to try batoo ocr tool (J2ME available) recompile tellico with --enable-webcam

The webcam(s) used

Integrated webcam in Latitude E6400 (does not work that well... blurred)
Logitech Pro 4000 640x480 perhaps missing auto-focus
Eee PC 901 1,3 Mpixel maybe 1280x1024 ? according to
Those integrated webcams seem to lack auto-focus support, in the end only scanning with my smartphone HTC Desire Z seemed to work effectively.

Verifying that gocr works on barcode

Well, to check that gocr works, just use barcode
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