OpenCV學習教程之腐蝕與膨脹

如何使用opencv提供的兩種最基本的形態學操作,腐蝕與膨脹( erosion 與 dilation)

內容來自於bradski和kaehler的大作： learning opencv .

#include "pch.h"

#include #include #include #include using namespace std;
using namespace cv;
//全域性變數
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;
//函式宣告
void erosion(int, void*);
void dilation(int, void*);
int main()
//建立顯示視窗
namedwindow("erosion demo", cv_window_autosize);
namedwindow("dilation demo", cv_window_autosize);
movewindow("dilation demo", src.cols, 0);
//建立腐蝕
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);
//建立膨脹
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);
//預設執行
erosion(0, 0);
dilation(0, 0);
waitkey(0);
return 0;
}void erosion(int, void*)
else if (erosion_elem == 1) 
else if (erosion_elem == 2) 
mat element = getstructuringelement(erosion_type,
size(2 * erosion_size + 1, 2 * erosion_size + 1),
point(erosion_size, erosion_size));
//腐蝕操作
erode(src, erosion_dst, element);
imshow("erosion demo", erosion_dst);
}void dilation(int, void*)
else if (dilation_elem) 
else if (dilation_elem) 
mat element = getstructuringelement(dilation_type,
size(2 * dilation_size + 1, 2 * dilation_size + 1),
point(dilation_size, dilation_size));
//膨脹操作
dilate(src, dilation_dst, element);
imshow("dilation demo", dilation_dst);
}

/**  @function erosion  */

void erosion( int, void* )
else if( erosion_elem == 1 )
else if( erosion_elem == 2) 
mat element = getstructuringelement( erosion_type,
size( 2*erosion_size + 1, 2*erosion_size+1 ),
point( erosion_size, erosion_size ) );
/// 腐蝕操作
erode( src, erosion_dst, element );
imshow( "erosion demo", erosion_dst );
}

mat element = getstructuringelement( erosion_type,

size( 2*erosion_size + 1, 2*erosion_size+1 ),
point( erosion_size, erosion_size ) );

矩形: morph_rect

交叉形: morph_cross

橢圓形: morph_ellipse

然後，我們還需要指定核心大小，以及 錨點 位置。不指定錨點位置，則預設錨點在核心中心位置。

就這些了，我們現在可以對影象進行腐蝕操作了。

/** @function dilation */

void dilation( int, void* )
else if( dilation_elem == 1 )
else if( dilation_elem == 2) 
mat element = getstructuringelement( dilation_type,
size( 2*dilation_size + 1, 2*dilation_size+1 ),
point( dilation_size, dilation_size ) );
/// 膨脹操作
dilate( src, dilation_dst, element );
imshow( "dilation demo", dilation_dst );
}

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