Takuya Nishimoto, Takayuki Watanabe. The comparison between the deletion-based methods and the mixing-based methods for audio CAPTCHA systems. In Takao Kobayashi, Keikichi Hirose, Satoshi Nakamura, editors, INTERSPEECH 2010, 11th Annual Conference of the International Speech Communication Association, Makuhari, Chiba, Japan, September 26-30, 2010. pages 266-269, ISCA, 2010. [doi]
Abstract is missing.