1 #include "opencv2/highgui/highgui.hpp" 2 #include "opencv2/imgproc/imgproc.hpp" 3 #include <iostream> 4 #include <stdio.h> 5 #include <stdlib.h> 6 7 using namespace cv; 8 using namespace std; 9 10 /// Global variables 11 Mat src, src_gray; 12 13 int maxCorners = 23; 14 int maxTrackbar = 100; 15 16 RNG rng(12345); 17 char* source_window = "Image"; 18 19 /// Function header 20 void goodFeaturesToTrack_Demo( int, void* ); 21 22 /** 23 * @function main 24 */ 25 int main( int argc, char** argv ) 26 { 27 /// Load source image and convert it to gray 28 src = imread( argv[1], 1 ); 29 cvtColor( src, src_gray, CV_BGR2GRAY ); 30 31 /// Create Window 32 namedWindow( source_window, CV_WINDOW_AUTOSIZE ); 33 34 /// Create Trackbar to set the number of corners 35 createTrackbar( "Max corners:", source_window, &maxCorners, maxTrackbar, goodFeaturesToTrack_Demo ); 36 37 imshow( source_window, src ); 38 39 goodFeaturesToTrack_Demo( 0, 0 ); 40 41 waitKey(0); 42 return(0); 43 } 44 45 /** 46 * @function goodFeaturesToTrack_Demo.cpp 47 * @brief Apply Shi-Tomasi corner detector 48 */ 49 void goodFeaturesToTrack_Demo( int, void* ) 50 { 51 if( maxCorners < 1 ) { maxCorners = 1; } 52 53 /// Parameters for Shi-Tomasi algorithm 54 vector<Point2f> corners; 55 double qualityLevel = 0.01; 56 double minDistance = 10; 57 int blockSize = 3; 58 bool useHarrisDetector = false; 59 double k = 0.04; 60 61 /// Copy the source image 62 Mat copy; 63 copy = src.clone(); 64 65 /// Apply corner detection 66 goodFeaturesToTrack( src_gray, 67 corners, 68 maxCorners, 69 qualityLevel, 70 minDistance, 71 Mat(), 72 blockSize, 73 useHarrisDetector, 74 k ); 75 76 77 /// Draw corners detected 78 cout<<"** Number of corners detected: "<<corners.size()<<endl; 79 int r = 4; 80 for( int i = 0; i < corners.size(); i++ ) 81 { circle( copy, corners[i], r, Scalar(rng.uniform(0,255), rng.uniform(0,255), 82 rng.uniform(0,255)), -1, 8, 0 ); } 83 84 /// Show what you got 85 namedWindow( source_window, CV_WINDOW_AUTOSIZE ); 86 imshow( source_window, copy ); 87 }