：验证码图片是论坛类网站用以阻止自动化程序恶意行为的重要人机区分技术，其设计和实用安全性直接涉及到互联网的正常使用。 为研究国内验证码实用安全性，设计实现一种验证码识别算法模型，对国内的论坛验证码类型进行了实验和分析。实验结果表明，实用中 的验证码识别率通常在50％以上，某些甚至达到100％，难以起到对自动化程序的阻碍作用。从实用角度将验证码分为4类，发现最佳的 一类基本是空白的，表明验证码实用技术还应做较大改进。-: Verification code image is a for

通过PCA主元分析降维来实现图像，人脸及光谱识别算法- Through principal component analysis PCA dimensionality reduction to achieve image, face recognition algorithm and spectrum

Verify recognition algorithm based on palmprint recognition undergraduate complete set of online identity, Achieve canonical correlation analysis, Convolution operation is intended to signal and image rendering.

The received signal is given eye and BER simulation systems, Convolution operation is intended to signal and image rendering, Pattern Recognition bayes discriminant analysis algorithm.