摘要： 使用改进的形状上下文方法对复杂验证码进行识别，采用整体识别方法，不对图片进行切割，使用半极坐标圆进行建模的方式，解决2个字符连接处像素点建模互相干扰的问题。设计并实现复杂验证码识别算法，并与简单验证码进行比较。实验结果证明，复杂验证码识别算法能对字符粘连的复杂验证码进行识别。

关键词: 验证码, 形状上下文, 整体识别

Abstract: This paper uses the improved shape context to recognize the complicated CAPTCHA. Through the holistic recognition method, without cutting the picture into pieces, but adopting semi-polar coordinates to model, it solves the problem that pixel points between two adhered characteristics interfered each other when modeling, designs and realizes its arithmetic method, and makes a contrast with other simple CAPTCHA’s identifying process. Experimental result shows the method put forward in this paper can recognize complicated CAPTCHA.

Key words: CAPTCHA, shape context, holistic recognition

中图分类号: 

• TP391.41