说明：  bmp图象处理类,实现了bmp图象的读写操作、图象缩放、旋转、加减、合成、边缘检测、测量周长、面积、小区域删除、去除黑斑、去除白班、二值化、抽取图象内点等。
(bmp image processing category, achieving bmp image read and write operations, image scaling, rotation, addition and subtraction, synthesis, edge detection, measurement perimeter, area, a small regional delete, remove blotches, remove the day shift, two values, images taken within points.)