ocr

1. http://stackoverflow.com/questions/1106202/android-ocr
2. http://code.google.com/p/tesseract-ocr/
3. http://www.win.tue.nl/~aeb/linux/ocr/tesseract.html

pre
sudo apt-get install libtiff4-dev

1. wget http://tesseract-ocr.googlecode.com/files/tesseract-3.00.tar.gz
   tar xvfz tesseract-3.00.tar.gz
   ./configure
   make && sudo make install
  ldconfig

2. wget http://tesseract-ocr.googlecode.com/files/eng.traineddata.gz
   cp eng.traineddata.gz /usr/local/share/tessdata
   gunzip eng.traineddata

3. in your workpath
   sudo ln -s /usr/local/share/tessdata tessdata
   export TESSDATA_PREFIX=./

4. tesseract p13a.tiff p13a

5. imagemagick
   convert a.jpg -compress None a.tiff