Created
October 25, 2015 00:10
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#include <iostream> | |
#include "opencv2/highgui/highgui.hpp" | |
#include "opencv2/imgproc/imgproc.hpp" | |
#include "opencv2/core/core.hpp" | |
using namespace std; | |
using namespace cv; | |
int main(int argc, char **argv) { | |
VideoCapture cap(0); | |
if ( !cap.isOpened() ) // if not success, exit program | |
{ | |
cout << "Cannot open the web cam" << endl; | |
return -1; | |
} | |
namedWindow("corners", CV_WINDOW_AUTOSIZE); | |
namedWindow("harris", CV_WINDOW_AUTOSIZE); | |
namedWindow("Control"); | |
int harrisThreshold = 200; | |
int blockSize = 2; | |
int ksize = 3; | |
int k = 4; | |
createTrackbar("harris threshold", "Control", &harrisThreshold, 255); | |
createTrackbar("blockSize", "Control", &blockSize, 20); | |
createTrackbar("kernel size", "Control", &ksize, 30); | |
createTrackbar("k", "Control", &k, 100); | |
while(true) { | |
Mat image; | |
cap.read(image); | |
Mat grayImage; | |
cvtColor(image, grayImage, CV_BGR2GRAY); | |
Mat harrisImage; | |
if (ksize % 2 == 0) { | |
ksize--; | |
} | |
cornerHarris(grayImage, harrisImage, max(blockSize, 2), | |
max(min(ksize, 31), 1), | |
k/100); | |
Mat normalized; | |
normalize(harrisImage, normalized, 0, 255, NORM_MINMAX, CV_32FC1, Mat() ); | |
imshow("corners", normalized); | |
/// Drawing a circle around corners | |
int max = 50; | |
int count = 0; | |
for( int j = 0; j < normalized.rows ; j++ ) { | |
for( int i = 0; i < normalized.cols && count < max; i++ ) { | |
if( (int) normalized.at<float>(j,i) > harrisThreshold ) { | |
circle(image, Point( i, j ), 8, Scalar(0, 0, 0xff), 1, 1, 0 ); | |
count++; | |
} | |
} | |
} | |
imshow("harris", image); | |
if (waitKey(30) == 27) { | |
cout << "esc key is pressed by user" << endl; | |
break; | |
} | |
} | |
return 0; | |
} |
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