使用特征提取与模板匹配方法识别数字验证码，预处理阶段包括验证码图像灰度化、二值化、去噪，去噪使用RGB三原色法，验证码字符分割采用自适应分割方法，最后提取单个验证码图像特征值，与模板库字符进行匹配识别(The use of feature extraction and template matching method of digital identification verification code, verification code preprocessing consists of image grayscale, binarization, denoising, denoising method using RGB color segmentation method based on adaptive segmentation, verification code character, finally extract single verification code image feature matching, character recognition and template library)