二值图像的腐蚀膨胀原理（附代码）

原理部分：https://blog.youkuaiyun.com/qq_25847123/article/details/73744575

代码：

#include <iostream>
#include<vector>
#include<iomanip>
using namespace std;

#define picX 6
#define picY 6

typedef struct _coord
{
	int x;
	int y;
}COORD;

int originPic[picX][picY] = {
	{0,0,0,0,0,0},
	{0,1,0,0,0,0},
	{0,1,1,1,0,0},
	{0,0,1,1,0,0},
	{0,0,1,0,0,0},
	{0,0,0,0,0,0}
};
vector<COORD> structEle;//存放结构元素的位置
void init()
{
	COORD pos[] = { {0,-1},{1,0},{0,0} };
	for (auto p : pos)
		structEle.push_back(p);
}
void output(int data[picX][picY]);

//膨胀
void expand()
{
	int dst[picX][picY] = { 0 };
	for (int i = 0; i < picX; i++)
	{
		for (int j = 0; j < picY; j++)
		{
			if (originPic[i][j] == 1)
			{
				for (auto p : structEle)
				{
					int dsX = i + p.x;
					int dsY = j + p.y;
					if (dsX >= 0 && dsX<picX && dsY >= 0 && dsY<picY) //防止越界
						dst[dsX][dsY] = 1;
				}
			}
		}
	}
	output(dst);
}
//腐蚀
void corrosion()
{
	int dst[picX][picY] = { 0 };
	for (int i = 0; i < picX; i++)
	{
		for (int j = 0; j < picY; j++)
		{
			//
			if (originPic[i][j] == 1)
			{
				bool bAllBlack = true;
				for (auto p : structEle)
				{
					int dsX = i + p.x;
					int dsY = j + p.y;
					if (dsX >= 0 && dsX < picX && dsY >= 0 && dsY < picY) //防止越界
					{
						if (originPic[dsX][dsY] == 0)
							bAllBlack = false;
					}
				}
				if (bAllBlack)
					dst[i][j] = 1;
			}
		}
	}
	output(dst);
}
int main() {
	init();
	//expand();
	corrosion();
	system("pause");
	return 0;
}
void output(int data[picX][picY])
{
	for (int i = 0; i < picX; i++)
	{
		for (int j = 0; j < picY; j++)
			cout << setw(4) << data[i][j];
		cout << endl;
	}
}