一个很好的sift算法实例，有图有真相，可以实现特征点匹配，并将两幅图像的匹配点连线，还可以实现拼接，内有几个demo。帮助大家学习。-A good sift algorithm instance, there are pictures and the truth, you can achieve the matching feature points, and the two images match point connection, you can also achieve stitchi