中文说明：经典的FAST源码，包括9,10,11,12点的实现，可以用于对比，提取速度很快，但是没有尺度信息。所以常应用到序列图像或尺度要求不高的方面，也可以建立高斯金字塔完善FAST。
English Description：
Classic fast source code, including 9,10,11,12 points, can be used for comparison, extraction speed is very fast, but there is no scale information. So it is often applied to the image sequence or scale requirements are not high, you can also build a Gaussian pyramid to improve fast.