samples/cpp/tutorial_code/ImgProc/Morphology_1.cpp

Erosion and Dilation sample code Check the corresponding tutorial for more details

 
#include "opencv2/imgproc.hpp"
#include "opencv2/highgui.hpp"
#include <iostream>
 
using namespace cv;
using namespace std;
 
Mat src, erosion_dst, dilation_dst;
 
int erosion_elem = 0;
int erosion_size = 0;
int dilation_elem = 0;
int dilation_size = 0;
int const max_elem = 2;
int const max_kernel_size = 21;
 
void Erosion( int, void* );
void Dilation( int, void* );
 
 
int main( int argc, char** argv )
{
 CommandLineParser parser( argc, argv, "{@input | LinuxLogo.jpg | input image}" );
 src = imread( samples::findFile( parser.get<String>( "@input" ) ), IMREAD_COLOR );
 if( src.empty() )
 {
 cout << "Could not open or find the image!\n" << endl;
 cout << "Usage: " << argv[0] << " <Input image>" << endl;
 return -1;
 }
 
 namedWindow( "Erosion Demo", WINDOW_AUTOSIZE );
 namedWindow( "Dilation Demo", WINDOW_AUTOSIZE );
 moveWindow( "Dilation Demo", src.cols, 0 );
 
 createTrackbar( "Element:\n 0: Rect \n 1: Cross \n 2: Ellipse", "Erosion Demo",
 &erosion_elem, max_elem,
 Erosion );
 
 createTrackbar( "Kernel size:\n 2n +1", "Erosion Demo",
 &erosion_size, max_kernel_size,
 Erosion );
 
 createTrackbar( "Element:\n 0: Rect \n 1: Cross \n 2: Ellipse", "Dilation Demo",
 &dilation_elem, max_elem,
 Dilation );
 
 createTrackbar( "Kernel size:\n 2n +1", "Dilation Demo",
 &dilation_size, max_kernel_size,
 Dilation );
 
 Erosion( 0, 0 );
 Dilation( 0, 0 );
 
 waitKey(0);
 return 0;
}
 
 
void Erosion( int, void* )
{
 int erosion_type = 0;
 if( erosion_elem == 0 ){ erosion_type = MORPH_RECT; }
 else if( erosion_elem == 1 ){ erosion_type = MORPH_CROSS; }
 else if( erosion_elem == 2) { erosion_type = MORPH_ELLIPSE; }
 
 Mat element = getStructuringElement( erosion_type,
 Size( 2*erosion_size + 1, 2*erosion_size+1 ),
 Point( erosion_size, erosion_size ) );
 
 erode( src, erosion_dst, element );
 imshow( "Erosion Demo", erosion_dst );
}
 
 
void Dilation( int, void* )
{
 int dilation_type = 0;
 if( dilation_elem == 0 ){ dilation_type = MORPH_RECT; }
 else if( dilation_elem == 1 ){ dilation_type = MORPH_CROSS; }
 else if( dilation_elem == 2) { dilation_type = MORPH_ELLIPSE; }
 
 Mat element = getStructuringElement( dilation_type,
 Size( 2*dilation_size + 1, 2*dilation_size+1 ),
 Point( dilation_size, dilation_size ) );
 
 dilate( src, dilation_dst, element );
 imshow( "Dilation Demo", dilation_dst );
}