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