94 lines
2.1 KiB
C++
94 lines
2.1 KiB
C++
/**
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* @function goodFeaturesToTrack_Demo.cpp
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* @brief Demo code for detecting corners using Shi-Tomasi method
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* @author OpenCV team
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*/
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#include "opencv2/highgui/highgui.hpp"
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#include "opencv2/imgproc/imgproc.hpp"
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#include <iostream>
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#include <stdio.h>
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#include <stdlib.h>
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using namespace cv;
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using namespace std;
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/// Global variables
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Mat src, src_gray;
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int maxCorners = 23;
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int maxTrackbar = 100;
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RNG rng(12345);
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char* source_window = "Image";
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/// Function header
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void goodFeaturesToTrack_Demo( int, void* );
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/**
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* @function main
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*/
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int main( int argc, char** argv )
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{
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/// Load source image and convert it to gray
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src = imread( argv[1], 1 );
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cvtColor( src, src_gray, CV_BGR2GRAY );
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/// Create Window
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namedWindow( source_window, CV_WINDOW_AUTOSIZE );
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/// Create Trackbar to set the number of corners
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createTrackbar( "Max corners:", source_window, &maxCorners, maxTrackbar, goodFeaturesToTrack_Demo );
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imshow( source_window, src );
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goodFeaturesToTrack_Demo( 0, 0 );
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waitKey(0);
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return(0);
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}
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/**
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* @function goodFeaturesToTrack_Demo.cpp
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* @brief Apply Shi-Tomasi corner detector
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*/
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void goodFeaturesToTrack_Demo( int, void* )
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{
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if( maxCorners < 1 ) { maxCorners = 1; }
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/// Parameters for Shi-Tomasi algorithm
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vector<Point2f> corners;
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double qualityLevel = 0.01;
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double minDistance = 10;
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int blockSize = 3;
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bool useHarrisDetector = false;
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double k = 0.04;
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/// Copy the source image
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Mat copy;
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copy = src.clone();
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/// Apply corner detection
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goodFeaturesToTrack( src_gray,
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corners,
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maxCorners,
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qualityLevel,
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minDistance,
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Mat(),
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blockSize,
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useHarrisDetector,
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k );
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/// Draw corners detected
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cout<<"** Number of corners detected: "<<corners.size()<<endl;
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int r = 4;
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for( int i = 0; i < corners.size(); i++ )
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{ circle( copy, corners[i], r, Scalar(rng.uniform(0,255), rng.uniform(0,255), rng.uniform(0,255)), -1, 8, 0 ); }
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/// Show what you got
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namedWindow( source_window, CV_WINDOW_AUTOSIZE );
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imshow( source_window, copy );
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}
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