DevOnLinux » ubuntu http://blog.devonlinux.net ICT solutions that work Tue, 02 Feb 2010 23:54:34 +0000 en hourly 1 http://wordpress.org/?v=3.0 Weta Digital http://blog.devonlinux.net/2010/01/21/weta-digital/ http://blog.devonlinux.net/2010/01/21/weta-digital/#comments Thu, 21 Jan 2010 09:42:59 +0000 neuromancer http://blog.devonlinux.net/?p=203 Quite amazing…
35.000-core ubuntu server farm renders Avatar.

]]> http://blog.devonlinux.net/2010/01/21/weta-digital/feed/ 0 Tesseract tif alpha layer http://blog.devonlinux.net/2009/10/26/tesseract-tif-alpha-layer/ http://blog.devonlinux.net/2009/10/26/tesseract-tif-alpha-layer/#comments Mon, 26 Oct 2009 17:50:05 +0000 neuromancer http://blog.devonlinux.net/?p=151 tesseract-ocr-eng and ita -> tesseract-ocr-ita). Ok, we are ready to do some text recognition… But, under Karmic Koala, there [...]]]> ocr_1Just a quick post about tesseract, a quite good solution for OCR under GNU/Linux (specifically Ubuntu Karmic Koala).
First install it trough apt-get
sudo apt-get tesseract-ocr
Install also your preferred language (in my case eng -> tesseract-ocr-eng and ita -> tesseract-ocr-ita).

Ok, we are ready to do some text recognition…
But, under Karmic Koala, there is a problem with tif image as reported by myself here: https://bugs.launchpad.net/ubuntu/+source/tesseract/+bug/461177
The problem is due to a transparent alpha layer that some tif images have (investigation needed here…*), so before do text recognition is necessary to eliminate it, elsewhere tesseract will generate an empty file…
Just install imagemagick and from a shell do this steps:
convert inputimage.tif inputimage_tmp.pbm
convert inputimage_tmp.pbm inputimage_ok.tif
Original solution founded here.

Now we are finally ready to launch tesseract on our tif image.
Just do
tesseract inputimage_ok.tif outputfile
and tesseract will generate outputfile.txt with recognized text.

ps. The packaged version under karmic is 2.03 and not the last one, 2.04, that, as advised on this page, fixed it. So if you prefer, remove old version and install the new version from source.

* Solved. In Gimp is possible to remove the alpha layer. Just go to
Layer (Livello) -> Transparency (Trasparenza) -> Remove alpha layer (Rimuovi canale alpha)

]]> http://blog.devonlinux.net/2009/10/26/tesseract-tif-alpha-layer/feed/ 0 Eclipse Galileo problem in Karmic Koala http://blog.devonlinux.net/2009/10/09/eclipse-galileo-problem-in-karmic-koala/ http://blog.devonlinux.net/2009/10/09/eclipse-galileo-problem-in-karmic-koala/#comments Fri, 09 Oct 2009 12:18:06 +0000 neuromancer http://blog.devonlinux.net/?p=136 A few day ago I began to use Ubuntu Karmic Koala 9.10 beta on my laptop.
It’s look very fine and also work great but yesterday I’ve found a big problem for me and all developer that use Eclipse as preferred IDE.

The problem is that Eclipse Galileo doesn’t work right with the new version of gtk (gtk+ 2.18), and therefore all the Eclipse GUI is unusable.
In particular I’ve noted that click of mouse are not intercepted correctly and also some interface redraw (for example if I change perspective or move some bar) doesn’t work.

Now, this morning I’ve found the bug and also a workaround for the moment.
Just open a terminal, then give this command export GDK_NATIVE_WINDOWS=true and finally launch eclipse from the same terminal.

Open Source community it’s amazing!

Update
Now eclipse packaged in Ubuntu official repository work without above trick. Simply install eclipse 3.5.1-0ubuntu7 (or later) from the Ubuntu archive.
Eclipse version in the official eclipse site doesn’t work right yet. (See #28 in this bug for a complete explanation of this Eclipse bug)

]]> http://blog.devonlinux.net/2009/10/09/eclipse-galileo-problem-in-karmic-koala/feed/ 0