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/* *@function SiftDetect.cpp *@brief 对sift特征检测和匹配进行测试，并实现RANSAC算法进行过滤错配点 *@author ltc *@date 11:20 Saturday，28 November，2015 */#include
   
    #include
    
     #include
     
      using namespace std;using namespace cv;//RANSAC算法vector
      
        ransac(vector
       
         matches,vector
        
          queryKeyPoint,vector
         
           trainKeyPoint);int main(int argc,char* argv[]){ //图像读取 Mat img1,img2; img1=imread("1 (2).jpg",CV_WINDOW_AUTOSIZE); img2=imread("2 (2).jpg",CV_WINDOW_AUTOSIZE); if(img1.empty()||img2.empty()) { return -1; } //sift特征提取 SiftFeatureDetector detector; vector
          
            keyPoint1,keyPoint2; detector.detect(img1,keyPoint1); detector.detect(img2,keyPoint2); //cout<<"Number of KeyPoint1:"<
           
            <
            
              matches; vector
             
              
               > matches_knn; matcher.match(des1,des2,matches); matcher.knnMatch(des1,des2,matches_knn,2);// cout<<"matches_knn.size:"<
               
                <
                
                  match_knn; for(int i=0;i
                 
                   matches_ransac=ransac(matches,keyPoint1,keyPoint2); Mat img_match,img_match_flann; drawMatches(img1,keyPoint1,img2,keyPoint2,matches_ransac,img_match); drawMatches(img1,keyPoint1,img2,keyPoint2,match_knn,img_match_flann); imshow("img_match",img_match); imshow("img_match_flann",img_match_flann); //for(size_t i=0;i
                  
                    ransac(vector
                   
                     matches,vector
                    
                      queryKeyPoint,vector
                     
                       trainKeyPoint){ //定义保存匹配点对坐标 vector
                      
                        srcPoints(matches.size()),dstPoints(matches.size()); //保存从关键点中提取到的匹配点对的坐标 for(int i=0;i
                       
                         inliersMask(srcPoints.size()); //匹配点对进行RANSAC过滤 homography = findHomography(srcPoints,dstPoints,CV_RANSAC,5,inliersMask); //RANSAC过滤后的点对匹配信息 vector
                        
                          matches_ransac; //手动的保留RANSAC过滤后的匹配点对 for(int i=0;i
                        
                       
                      
                     
                    
                   
                  
                 
                
               
              
             
            
           
          
         
        
       
      
     
    
   

SIFT原理：

匹配结果：