This is a contour-based text detection module implemented by Marius Renn 
during his internship with the OCR group at 2006.  The algorithm is designed
to be light-weight and targeted for the Android platform, with the intention
of open-sourcing it in the future.
All the Google and Android specific codes can be found in 
//google3/ocr/helium
The details of the algorithm can be found in 
http://wiki.corp.google.com/twiki/bin/view/Main/HeliumMobileTextDetector