摄像机的标定、角点的提取、三维空间的重建、最后生成矫正后无畸变的图形-Camera Calibration，This section takes you through a complete calibration example based on a total of 20 (and 25) images of a planar checkerboard. This example lets you learn how to use all the features of the tool

sift算法，检测角点，关键点描述，匹配特征点-sift algorithm