digits augmentation

28x28 size digit image database Each image group has different angles, position and sizes. Images were separated into training and testing, with a maximum of 5.000 in each

本数据集为28×28尺寸的数字图像数据库。每个图像组包含不同角度、位置与尺寸的图像。数据集已划分为训练集与测试集，每部分的最大样本量均为5000。