A Projection-based Segmentation Algorithm for Breaking MSN and YAHOO CAPTCHAs
Shih‐Yu Huang, Yeuan-Kuen Lee, Graeme Baxter Bell, Zhan-He Ou · 2008
Abstract—Defeating a CAPTCHA test requires two procedures: segmentation and recognition. Recent research shows that the problem of segmentation is much harder than recognition. In this paper, a new projection-based segmentation algorithm is proposed for the MSN and Yahoo CAPTCHAs. Experimental results show that the proposed algorithm can improve correct segmentation rates ranging from 9 % to 14 % over the traditional one. Index Terms—CAPTCHA, segmentation, recognition I.