Peipeng Liu, Jinqiao Shi, Lihong Wang, Li Guo. An Efficient Ellipse-Shaped Blobs Detection Algorithm for Breaking Facebook CAPTCHA. In Yuyu Yuan, Xu Wu, Yueming Lu, editors, Trustworthy Computing and Services - International Conference, ISCTCS 2012, Beijing, China, May 28 - June 2, 2012, Revised Selected Papers. Volume 320 of Communications in Computer and Information Science, pages 420-428, Springer, 2012. [doi]
Abstract is missing.