这个绝对是原创，我自己研究SIFT写的ppt，重点是前面高斯金字塔那里，感觉思路还是比较清晰的 ，学习SIFT的可以看一下-This is absolutely an original, written by my own research SIFT ppt, where the focus is in front of the Gaussian pyramid, or a clearer sense of thinking and learning that can take a look SIFT