提出了一种基于整体（凹凸）特性的脱机大写体英文字母识别方法。首先计算字母图像的赋值背景，再从中提取凹凸特性，然后根据凹凸特性构建分类表进行分类识别。-This paper presents an off-line capitalization method based on the whole (concavity) feature. First, calculate the background of the letter image, and then extract the convex and concave characteristics, and then according to the convex characteristics of the classification table for classification and identification.