Routine of image matching using SIFT library under OPENCV
// opencv_empty_proj.cpp: Defines the entry point of the console application.
//
# contains "stdafx.h"
# include & ltopencv 2/opencv . HPP & gt；
# include & ltopencv 2/features 2d/features 2d . HPP & gt；
# include & ltopen cv2/non free/non free . HPP & gt；
# include & ltopencv 2/legacy/legacy . HPP & gt；
# include & ltvector & gt
Use namespace std
Use namespace cv;
int _tmain(int argc，_TCHAR* argv[])
{
const char * imagename = " img.jpg
//Read the image from the file
mat img = im read(imagename)；
mat img 2 = im read(" img 2 . jpg ")；
//If reading the image fails,
if(img.empty())
{
Fprintf(stderr, "Unable to load image %s\n", imagename);
return- 1；
}
if(img2.empty())
{
Fprintf(stderr, "Unable to load image %s\n", imagename);
return- 1；
}
//Display image
Imshow (IMG);
imshow("image2 before "，img 2)；
//sift feature detection
SiftFeatureDetector
Vector & lt Important Hint & gtkp 1, kp2
siftdtc.detect(img，KP 1)；
mat outimg 1；
drawKeypoints(img，kp 1，outimg 1)；
imshow("image 1 keypoints "，outimg 1)；
Key point KP;
Vector & lt Important Tips & gt Iterator itvc
for(itvc = KP 1 . begin()； itvc！ = KP 1 . end()； itvc++)
{
Cout & lt& lt "Angle:"<& ltitvc-& gt；; Angle & lt<& lt" \ t "<& ltitvc-& gt；; class _ id & lt& lt" \ t " & lt& ltitvc-& gt； octave & lt& lt" \ t " & lt& ltitvc-& gt； pt & lt& lt" \ t " & lt& ltitvc-& gt； Response & lt& ltendl
}
siftdtc.detect(img2，kp2)；
Mat outimg2
Draw key points (img2, kp2, OUTIMG 2);
Imshow ("key point of image 2", OUTI MG 2);
Extractor;
Mat descriptor 1，descriptor2
BruteForceMatcher & ltL2<float & gt& gtmatcher
Vector & ltDMatch & gt match;
Mat img _ matches
extractor.compute(img，kp 1，descriptor 1)；
extractor.compute(img2，kp2，descriptor 2)；
imshow("desc "，descriptor 1)；
cout & lt& ltendl & lt& ltdescriptor 1 & lt； & ltendl
Matcher.match (descriptor 1, descriptor 2, matches);
drawMatches(img，kp 1，img2，kp2，Matches，img _ matches)；
imshow("matches "，img _ matches)；
//This function waits for the key, and then presses any key on the keyboard to return.
wait key()；
Returns 0;
}