OpenCV之特征检测器（Feature Detector），描述子提取器（Descriptor Extractor）和描述子匹配器（Descriptor Matcher）

1.特征检测子

    -Harris

cv::cornerHarris(image,strength,3,3,0.01);

    -Fast

cv::Ptr fast = cv::FastFeatureDetector::create();

//或

cv::FAST(InputArray image, std::vector &keypoints, int threshold)

//或

cv::FAST(InputArray image, std::vector &keypoints, int threshold, bool nonmaxSuppression, int type)

    -SIFT

cv::Ptr sift = cv::xfeatures2d::SIFT::create();

//或

cv::Ptr sift = cv::xfeatures2d::SiftFeatureDetector::create();
 
  
 
  
 
  
 
  
    -SURF
 
  
 
  
cv::Ptr surf = cv::xfeatures2d::SURF::create();
 
  
//或
 
  
cv::Ptr surf = cv::xfeatures2d::SurfFeatureDetector::create();
 
  
 
  
    -ORB
 
  
 
  
cv::Ptr orb = cv::ORB::create();
 
  
 
      -MSER 
  
 
  
 
  
cv::Ptr mser = cv::MSER::create();
 
  
 
  
    -GFTT
 
  
 
  
cv::Ptr gftt = cv::GFTTDetector::create();
 
  
 
  
或者直接用goodFeaturesToTrack function；
 
  
    -AGAST
 
  
 
  
cv::AGAST(InputArray image, std::vector &keypoints, int threshold)
//或
cv::AGAST(InputArray image, std::vector &keypoints, int threshold, bool nonmaxSuppression, int type)
//或
cv::Ptr agast = cv::AgastFeatureDetector::create();
 
  
 
  
    -BRISK
 
  
 
  
cv::Ptr brisk = cv::BRISK::create();
 
   
  
 
  

     -SimpleBlob 
  
 
  
cv::Ptr blob = cv::SimpleBlobDetector::create();
 
  
 
      -KAZE 
  
 
  
 
  
cv::Ptr kaze = cv::KAZE::create();
 
  
 
  
    -AKAZE
 
  
 
  
cv::Ptr akaze = cv::AKAZE::create();
 
  
 
  
2.描述子提取器
 
  
 
 
  
    -SIFT
 
  
 
  
cv::Ptr sift = cv::xfeatures2d::SIFT::create();
//或
cv::Ptr sift = cv::xfeatures2d::SiftDescriptorExtractor::create();
 
  
 
  
    -SURF
 
  
 
  
cv::Ptr surf = cv::xfeatures2d::SURF::create();
//或
cv::Ptr surf = cv::xfeatures2d::SurfDescriptorExtractor::create();
 
  
 
  
    -BRIEF
 
  
Opencv中没有单独将BRIEF用来提取描述子，因为它是被用于ORB中的；
 
  
    -BRISK
 
  
 
  
cv::Ptr brisk = cv::BRISK::create();
 
  
 
  
    -ORB
 
  
 
  
cv::Ptr orb = cv::ORB::create();
 
  ORB是用fast特征；  
  
 
  
   -KAZE
 
  
 
  
cv::Ptr kaze = cv::KAZE::create();
 
  
 
  
注：KAZE描述子只能使用KAZE或AKAZE特征点；
 
  
    -AKAZE
 
  
 
  
cv::Ptr akaze = cv::AKAZE::create();
 
  
同样，AKAZE描述子也只能使用KAZE或AKAZE特征点；
 
  
 
 
  
 3.描述子匹配器 
  
   -BruteForce-BFMatcher
 
  
 
  
cv::Ptr bf = cv::BFMatcher::create("BruteForce");
 
  
 
  
其中，匹配类型还可以是“BruteForce-L1”，“BruteForce-L2”，“BruteForce-Hamming”；
 
  
   -FlannBased-FlannBasedMatcher
 
  
 
  
cv::Ptr flann = cv::FlannBasedMatcher::create("FlannBased");