OpenCV2.4 例程四 (形态学操作)

以下程序来自OpenCV例程：

#define CV_NO_BACKWARD_COMPATIBILITY
#include "stdafx.h"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <stdlib.h>
#include <stdio.h>

using namespace cv;

void help()
{

	printf("\nShow off image morphology: erosion, dialation, open and close\n"
		"Call:\n   morphology2 [image]\n"
		"This program also shows use of rect, elipse and cross kernels\n\n");
	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" );
}

Mat src, dst;

int element_shape = MORPH_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, void*)
{
	int n = open_close_pos - max_iters;
	int an = n > 0 ? n : -n;
	Mat element = getStructuringElement(element_shape, Size(an*2+1, an*2+1), Point(an, an) );
	if( n < 0 )
		morphologyEx(src, dst, CV_MOP_OPEN, element);
	else
		morphologyEx(src, dst, CV_MOP_CLOSE, element);
	imshow("Open/Close",dst);
}

// callback function for erode/dilate trackbar
void ErodeDilate(int, void*)
{
	int n = erode_dilate_pos - max_iters;
	int an = n > 0 ? n : -n;
	Mat element = getStructuringElement(element_shape, Size(an*2+1, an*2+1), Point(an, an) );
	if( n < 0 )
		erode(src, dst, element);
	else
		dilate(src, dst, element);
	imshow("Erode/Dilate",dst);
}


int main( int argc, char** argv )
{
	char* filename ="H:\\OpenCV2.4\\opencv\\samples\\cpp\\baboon.jpg";
	if( (src = imread(filename,1)).data == 0 )
		return -1;

	help();

	//create windows for output images
	namedWindow("Open/Close",1);
	namedWindow("Erode/Dilate",1);

	open_close_pos = erode_dilate_pos = max_iters;
	createTrackbar("iterations", "Open/Close",&open_close_pos,max_iters*2+1,OpenClose);
	createTrackbar("iterations", "Erode/Dilate",&erode_dilate_pos,max_iters*2+1,ErodeDilate);

	for(;;)
	{
		int c;

		OpenClose(open_close_pos, 0);
		ErodeDilate(erode_dilate_pos, 0);
		c = cvWaitKey(0);

		if( (char)c == 27 )
			break;
		if( (char)c == 'e' )
			element_shape = MORPH_ELLIPSE;
		else if( (char)c == 'r' )
			element_shape = MORPH_RECT;
		else if( (char)c == 'c' )
			element_shape = MORPH_CROSS;
		else if( (char)c == ' ' )
			element_shape = (element_shape + 1) % 3;
	}

	return 0;
}

原图：

开闭操作的结果：

膨胀腐蚀的结果：