图像及动画处理一：iphone中把一个图片切割成多个图片，并保存的例子 -Processing an image and animation: iphone cut a picture in the multiple images and save the example

用于检测数字表盘矩形框，识别并划分出矩形框进行切割(Used for detecting the rectangle of a digital dial, identifying and dividing the rectangle for cutting)