OpenCV杂记06---形态学、膨胀和腐蚀

原文地址：

http://www.opencv.org.cn/opencvdoc/2.3.2/html/doc/tutorials/imgproc/erosion_dilatation/erosion_dilatation.html#morphology-1

总结本程序的收获。

1、掌握窗口排列函数cvMoveWindow的使用。

2、学会创建滑动条并调用回调函数。createTrackbar的第五个参数调用自定义的函数。

存疑的问题。

1、滑动条的名字显示不完整，中间部分被省略。

代码如下。

#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "highgui.h"
#include <stdlib.h>
#include <stdio.h>
using namespace cv;
using namespace std;
/// 全局变量
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;
char* win_name1 = "Erosion Demo";
char* win_name2 = "Dilation Demo";
/** Function Headers */
void Erosion( int, void* );
void Dilation( int, void* );
/** @function main */
int main( int argc, char** argv )
{
char* ImgPath = "D:/lena.jpg";
/// Load 图像
src = imread( ImgPath );
if( !src.data )
{ return -1; }
/// 创建显示窗口
namedWindow( win_name1, CV_WINDOW_AUTOSIZE );
namedWindow( win_name2, CV_WINDOW_AUTOSIZE );
cvMoveWindow( win_name1, 0,0 );
cvMoveWindow( win_name2, src.cols , 0 );
/// 创建腐蚀 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 );
/// 创建膨胀 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(0);
return 0;
}
/**  @function Erosion  */
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 ) );
/// 腐蚀操作
erode( src, erosion_dst, element );
imshow( win_name1, erosion_dst );
}
/** @function Dilation */
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 ) );
///膨胀操作
dilate( src, dilation_dst, element );
imshow( win_name2, dilation_dst );
}