OpenCV自带例子（八）图像腐蚀与膨胀

#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <stdlib.h>
#include <stdio.h>
using namespace cv;

//Global Variables
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;

/**Function headers */

void Erosion( int, void* );
void Dilation( int, void* );

int main( int argc, char** argv )
{
// Load an image
src = imread( "D:\\image\\aa.jpg" );
if ( !src.data )
{
return -1;
}

// create windows
namedWindow( "Erosion Demo", CV_WINDOW_AUTOSIZE );
namedWindow( "Dilation Demo", CV_WINDOW_AUTOSIZE );
cvMoveWindow( "Dilation Demo", src.cols, 0 );

// create erosion trackbar
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 );

// create dilation trackbar
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 );

//default start
Erosion( 0, 0 );
Dilation( 0, 0 );
waitKey();
imwrite("D:\\image\\erosion.jpg",  erosion_dst);
imwrite("D:\\image\\dilation.jpg", dilation_dst);
return 0;
}

void Erosion( int, void* )
{
int erosion_type;
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 ));
// apply the erosion operation
erode ( src, erosion_dst, element );
imshow( "Erosion Demo", erosion_dst );
}

void Dilation( int, void*)
{
int dilation_type;
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));

// apply the dilation operation
dilate( src, dilation_dst, element );
imshow( "Dilation Demo", dilation_dst);
}