#include???
#include???
#include?“opencv2/core.hpp“??
#include?“opencv2/core/utility.hpp“??
#include?“opencv2/core/ocl.hpp“??
#include?“opencv2/imgcodecs.hpp“??
#include?“opencv2/highgui.hpp“??
#include?“opencv2/features2d.hpp“??
#include?“opencv2/calib3d.hpp“??
#include?“opencv2/imgproc.hpp“??
#include“opencv2/flann.hpp“??
#include“opencv2/xfeatures2d.hpp“??
#include“opencv2/ml.hpp“??

using?namespace?std;?
using?namespace?cv;?
using?namespace?xfeatures2d;
using?namespace?cv::ml;

int?main（int?argc?char**?argv）?
{?

Mat?ab;
a?=?imread（“A.jpg“?0）;?//讀取要匹配的兩張圖像?
b?=?imread（“B.jpg“?0）;
vector?matches;??????//DMatch是用來(lái)描述匹配好的一對(duì)特征點(diǎn)的類，包含這兩個(gè)點(diǎn)之間的相關(guān)信息	??????????????????????
vector?key1key2;?????//關(guān)鍵點(diǎn)容器
Mat?cd;???//sift描述子
Ptr?sift?=?xfeatures2d::SIFT::create（0?3?0.04?10）;?//創(chuàng)建sift對(duì)象
BFMatcher?matcher;?????????//實(shí)例化一個(gè)暴力匹配器

sift->detectAndCompute（a?noArray（）?key1?c）;????//給描述子賦值
sift->detectAndCompute（b?noArray（）?key2?d）;?
matcher.match（c?d?matches）;?????????????//匹配，數(shù)據(jù)來(lái)源是特征向量，結(jié)果存放在DMatch類型里面?

	??????????????????????????????????????????//sort函數(shù)對(duì)數(shù)據(jù)進(jìn)行升序排列
sort（matches.begin（）?matches.end（））;?????//篩選匹配點(diǎn)，根據(jù)match里面特征對(duì)的距離從小到大排序
vector