SPIE Proceedings [SPIE Electronic Imaging 2006 - San Jose, CA (Sunday 15 January 2006)] Document Recognition and Retrieval XIII - CAPTCHA challenge strings: problems and improvements
Bentley, Jon, Mallows, Colin, Taghva, Kazem, Lin, XiaofanVolume:
6067
Year:
2006
Language:
english
DOI:
10.1117/12.650644
File:
PDF, 191 KB
english, 2006