采用8种方法对图像Mat的像素进行扫描，并对像素点的像素进行压缩，压缩间隔为div=64,并比较扫描及压缩的效率,效率最高的是采用.ptr及减少循环次数来遍历图像，并采用位操作来对图像像素进行压缩。-8-Mat method for image scanning pixel pixel pixel compression and compression interval div = 64, and scanning and comparing the compression efficiency

Qt、Opencv环境下，演示ptr、at（）函数遍历图像示例，在该示例中显示了简单圆和线的绘制。仅仅用于教学演示，没有采用Bresenham等快速算法。-Under Qt, Opencv environment, demonstrate ptr, at () function to traverse a sample image showing the draw simple circles and lines in this example. Only for teaching demons