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#define CV_NO_BACKWARD_COMPATIBILITY
#include <cv.h>
#include <highgui.h>
#include <stdlib.h>
#include <stdio.h>
IplImage* src = 0;
IplImage* dst = 0;
IplConvKernel* element = 0;
int element_shape = CV_SHAPE_RECT;
//the address of variable which receives trackbar position update
int max_iters = 10;
int open_close_pos = 0;
int erode_dilate_pos = 0;
// callback function for open/close trackbar
void OpenClose(int pos)
{
int n = open_close_pos - max_iters;
int an = n > 0 ? n : -n;
element = cvCreateStructuringElementEx( an*2+1, an*2+1, an, an, element_shape, 0 );
if( n < 0 )
{
cvErode(src,dst,element,1);
cvDilate(dst,dst,element,1);
}
else
{
cvDilate(src,dst,element,1);
cvErode(dst,dst,element,1);
}
cvReleaseStructuringElement(&element);
cvShowImage("Open/Close",dst);
}
// callback function for erode/dilate trackbar
void ErodeDilate(int pos)
{
int n = erode_dilate_pos - max_iters;
int an = n > 0 ? n : -n;
element = cvCreateStructuringElementEx( an*2+1, an*2+1, an, an, element_shape, 0 );
if( n < 0 )
{
cvErode(src,dst,element,1);
}
else
{
cvDilate(src,dst,element,1);
}
cvReleaseStructuringElement(&element);
cvShowImage("Erode/Dilate",dst);
}
int main( int argc, char** argv )
{
char* filename = argc == 2 ? argv[1] : (char*)"baboon.jpg";
if( (src = cvLoadImage(filename,1)) == 0 )
return -1;
printf( "Hot keys: \n"
"\tESC - quit the program\n"
"\tr - use rectangle structuring element\n"
"\te - use elliptic structuring element\n"
"\tc - use cross-shaped structuring element\n"
"\tSPACE - loop through all the options\n" );
dst = cvCloneImage(src);
//create windows for output images
cvNamedWindow("Open/Close",1);
cvNamedWindow("Erode/Dilate",1);
open_close_pos = erode_dilate_pos = max_iters;
cvCreateTrackbar("iterations", "Open/Close",&open_close_pos,max_iters*2+1,OpenClose);
cvCreateTrackbar("iterations", "Erode/Dilate",&erode_dilate_pos,max_iters*2+1,ErodeDilate);
for(;;)
{
int c;
OpenClose(open_close_pos);
ErodeDilate(erode_dilate_pos);
c = cvWaitKey(0);
if( (char)c == 27 )
break;
if( (char)c == 'e' )
element_shape = CV_SHAPE_ELLIPSE;
else if( (char)c == 'r' )
element_shape = CV_SHAPE_RECT;
else if( (char)c == 'c' )
element_shape = CV_SHAPE_CROSS;
else if( (char)c == ' ' )
element_shape = (element_shape + 1) % 3;
}
//release images
cvReleaseImage(&src);
cvReleaseImage(&dst);
//destroy windows
cvDestroyWindow("Open/Close");
cvDestroyWindow("Erode/Dilate");
return 0;
}