mirror of
https://github.com/opencv/opencv.git
synced 2026-07-25 13:23:02 +04:00
Asal Mirzaieva
114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
/**
|
|
* @function generalContours_demo1.cpp
|
|
* @brief Demo code to find contours in an image
|
|
* @author OpenCV team
|
|
*/
|
|
|
|
#include "opencv2/imgcodecs.hpp"
|
|
#include "opencv2/highgui.hpp"
|
|
#include "opencv2/imgproc.hpp"
|
|
#include <iostream>
|
|
|
|
using namespace cv;
|
|
using namespace std;
|
|
|
|
Mat src; Mat src_gray;
|
|
int thresh = 100;
|
|
int max_thresh = 255;
|
|
RNG rng(12345);
|
|
|
|
/// Function header
|
|
void thresh_callback(int, void* );
|
|
|
|
/**
|
|
* @function main
|
|
*/
|
|
int main( int, char** argv )
|
|
{
|
|
//![setup]
|
|
/// Load source image
|
|
src = imread( argv[1], IMREAD_COLOR );
|
|
|
|
/// Convert image to gray and blur it
|
|
cvtColor( src, src_gray, COLOR_BGR2GRAY );
|
|
blur( src_gray, src_gray, Size(3,3) );
|
|
//![setup]
|
|
|
|
//![createWindow]
|
|
/// Create Window
|
|
const char* source_window = "Source";
|
|
namedWindow( source_window, WINDOW_AUTOSIZE );
|
|
imshow( source_window, src );
|
|
//![createWindow]
|
|
|
|
//![taskbar]
|
|
createTrackbar( " Threshold:", "Source", &thresh, max_thresh, thresh_callback );
|
|
//![taskbar]
|
|
|
|
//![callback00]
|
|
thresh_callback( 0, 0 );
|
|
//![callback00]
|
|
|
|
//![waitForIt]
|
|
waitKey(0);
|
|
//![waitForIt]
|
|
|
|
return(0);
|
|
}
|
|
|
|
/**
|
|
* @function thresh_callback
|
|
*/
|
|
void thresh_callback(int, void* )
|
|
{
|
|
Mat threshold_output;
|
|
vector<vector<Point> > contours;
|
|
vector<Vec4i> hierarchy;
|
|
|
|
//![threshold]
|
|
/// Detect edges using Threshold
|
|
threshold( src_gray, threshold_output, thresh, 255, THRESH_BINARY );
|
|
//![threshold]
|
|
|
|
//![findContours]
|
|
/// Find contours
|
|
findContours( threshold_output, contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE, Point(0, 0) );
|
|
//![findContours]
|
|
|
|
/// Approximate contours to polygons + get bounding rects and circles
|
|
vector<vector<Point> > contours_poly( contours.size() );
|
|
vector<Rect> boundRect( contours.size() );
|
|
vector<Point2f>center( contours.size() );
|
|
vector<float>radius( contours.size() );
|
|
|
|
//![allthework]
|
|
for( size_t i = 0; i < contours.size(); i++ )
|
|
{
|
|
approxPolyDP( Mat(contours[i]), contours_poly[i], 3, true );
|
|
boundRect[i] = boundingRect( Mat(contours_poly[i]) );
|
|
minEnclosingCircle( contours_poly[i], center[i], radius[i] );
|
|
}
|
|
//![allthework]
|
|
|
|
//![zeroMat]
|
|
/// Draw polygonal contour + bonding rects + circles
|
|
Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 );
|
|
//![zeroMat]
|
|
|
|
//![forContour]
|
|
for( size_t i = 0; i< contours.size(); i++ )
|
|
{
|
|
Scalar color = Scalar( rng.uniform(0, 255), rng.uniform(0,255), rng.uniform(0,255) );
|
|
drawContours( drawing, contours_poly, (int)i, color, 1, 8, vector<Vec4i>(), 0, Point() );
|
|
rectangle( drawing, boundRect[i].tl(), boundRect[i].br(), color, 2, 8, 0 );
|
|
circle( drawing, center[i], (int)radius[i], color, 2, 8, 0 );
|
|
}
|
|
//![forContour]
|
|
|
|
//![showDrawings]
|
|
/// Show in a window
|
|
namedWindow( "Contours", WINDOW_AUTOSIZE );
|
|
imshow( "Contours", drawing );
|
|
//![showDrawings]
|
|
}
|