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key_points_test.cpp
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key_points_test.cpp
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#include <iostream>
#include <stdio.h>
#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/nonfree/features2d.hpp>
#include <opencv2/legacy/legacy.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <vector>
using namespace std;
using namespace cv;
void drawVectors (const Mat& img1,
const vector<KeyPoint>& keypoints1,
const Mat& img2,
const vector<KeyPoint>& keypoints2,
const vector<DMatch>& matches1to2,
Mat& outImg,
const Scalar& matchColor=Scalar::all(-1),
const Scalar& singlePointColor=Scalar::all(-1),
const vector<char>& matchesMask=vector<char>(),
int flags=DrawMatchesFlags::DEFAULT)
{
//copy image
if( img2.type() == CV_8UC3 )
{
img2.copyTo( outImg );
}
else if( img2.type() == CV_8UC1 )
{
cvtColor( img2, outImg, CV_GRAY2BGR );
}
//It is really a fucking shit. Some constant multipliers, opencv is very interesting...
vector<DMatch>::const_iterator match = matches1to2.begin(), last_match = matches1to2.end();
//draw offset of each keypoint on second image
while (match!=last_match)
{
if( matchesMask.empty())
{
int first_img_ind = match->queryIdx;
int second_img_ind = match->trainIdx;
Point center_from( keypoints1[first_img_ind].pt.x*16, keypoints1[first_img_ind].pt.y*16);
Point center_to( keypoints2[second_img_ind].pt.x*16, keypoints2[second_img_ind].pt.y*16);
int radius = 3*16;
circle( outImg, center_to, radius, singlePointColor, 1, CV_AA, 4);
line(outImg, center_from, center_to, singlePointColor, 1, CV_AA, 4);
++match;
}
}
}
int main( int argc, char** argv )
{
VideoCapture cap(0);
if(!cap.isOpened()) // check camera
{
string message = "Camera is Broken";
cout << message << endl;
return -1;
}
Mat frame_1, frame_2, outpt, outpt_kp;
std::vector<KeyPoint> keypoints_object_1, keypoints_object_2;
int minHessian = 2000;
SurfFeatureDetector detector( minHessian );
namedWindow("frame",1);
//take a snapshot from camera, as first image
for(;;)
{
//show every frame with keypoints
cap >> frame_1; // get a new frame from camera
detector.detect( frame_1, keypoints_object_1 );
drawKeypoints(frame_1, keypoints_object_1, outpt_kp, Scalar( 0, 255, 255 ), DrawMatchesFlags::DEFAULT );
imshow("frame", outpt_kp);
if(waitKey(30) >= 0)
{
//save snapshot
imwrite( "./test_img.jpg", frame_1);
break;
}
}
//and then load it as reference image
Mat reference_image;
reference_image = imread( "./test_img.jpg", 1 );
detector.detect( reference_image, keypoints_object_1 );
// detect keypoints offset on each frame
for(;;)
{
//detect keypoints
cap >> frame_2; // get a new frame from camera
detector.detect( frame_2, keypoints_object_2 );
SurfDescriptorExtractor extractor;
cv::Mat descriptors1, descriptors2;
//kompute keypoints deskriptors
extractor.compute(reference_image, keypoints_object_1, descriptors1);
extractor.compute(frame_2, keypoints_object_2, descriptors2);
//match keypoints between images
FlannBasedMatcher matcher;
vector< DMatch > matches;
matcher.match(descriptors1, descriptors2, matches);
double max_dist = 0; double min_dist = 100;
// Quick calculation of max and min distances between keypoints
for( int i = 0; i < descriptors1.rows; i++ )
{
double dist = matches[i].distance;
if( dist < min_dist ) min_dist = dist;
if( dist > max_dist ) max_dist = dist;
}
printf("-- Max dist : %f \n", max_dist );
printf("-- Min dist : %f \n", min_dist );
// Draw only "good" matches (i.e. whose distance is less than some_value*min_dist )
std::vector< DMatch > good_matches;
for( int i = 0; i < descriptors1.rows; i++ )
{
if( matches[i].distance < 2*min_dist )
{
good_matches.push_back( matches[i]);
}
}
//show keypoints offset (uncomment one of these bellow)
//drawMatches(reference_image, keypoints_object_1, frame_2, keypoints_object_2, good_matches, outpt, Scalar( 0, 255, 255 ), Scalar( 255, 0, 255 ), vector<char>(), DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS );
drawVectors(reference_image, keypoints_object_1, frame_2, keypoints_object_2, good_matches, outpt, Scalar( 0, 255, 255 ), Scalar( 255, 0, 255 ), vector<char>(), DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS );
imshow("frame", outpt);
if(waitKey(30) >= 0)
{
imwrite( "./test_img1.jpg", frame_2);
break;
}
}
}