opencv 提取單通道圖像輪廓

程式功能：提取單通道圖像輪廓

#include <opencv.hpp>    
#include <iostream>    
#include <vector>    
using namespace cv;
using namespace std;
int main()
{
	Mat SrcImage = imread("1.png");
	Mat grayImage, dstImage;
	//namedWindow("原圖", 2);
	imshow("原圖", SrcImage);
	cvtColor(SrcImage, grayImage, COLOR_RGB2GRAY);//灰階圖
	threshold(grayImage, dstImage, 100, 255, THRESH_BINARY);//二值化圖
	uchar *data = dstImage.data;
	int height = dstImage.rows;
	int width = dstImage.cols*dstImage.channels();
	cout << height << " " << width << endl;
	vector<vector<int>> state(height, vector<int>(width, 0));     //動态二維數組，存儲狀态

	for (int i = 0; i < height; i++)
	{
		uchar *p = dstImage.ptr<uchar>(i);             //行指針
		for (int j = 0; j < width; j++)
		{
			if (data[i*dstImage.step + j] == 0)
			{
				for (int m = i - 1; m <= i + 1; m++)
				{
					for (int n = j - 1; n <= j + 1; n++)
					{
						if (data[m*dstImage.step + n] == 255)
						{
							state[i][j] = 1;
						}
					}
				}
			}

		}
	}
	for (int i = 0; i < height; i++)
	{
		uchar *p = dstImage.ptr<uchar>(i);
		for (int j = 0; j < width; j++)
		{
			if (state[i][j] == 1)
			{
				p[j] = 255;
			}
			else
			{
				p[j] = 0;
			}
		}
	}
	//namedWindow("輪廓圖", 2);
	imshow("輪廓圖", dstImage);
	waitKey(0);
	return 0;
}
           

程式結果：