Hacking Chinese Touclick CAPTCHA by Multi-Scale Corner Structure Model with Fast Pattern Matching

@inproceedings{CSM_2014_ACMMM,
  author = {Shen, Yunhang and Ji, Rongrong and Cao, Donglin and Wang, Min},
  title = {Hacking Chinese Touclick CAPTCHA by Multi-Scale Corner Structure Model with Fast Pattern Matching},
  booktitle = {Proceedings of the 22Nd ACM International Conference on Multimedia (ACMMM)},
  year = {2014}
}