#include "stdafx.h"
#include <cv.h>  
#include <highgui.h>  
#include <opencv2/imgproc/imgproc.hpp>    
#include <opencv2/highgui/highgui.hpp>    
#include <iostream>    
#include <vector>    


using namespace cv;
using namespace std;

void RemoveSmallRegion(Mat& Src, Mat& Dst, int AreaLimit = 50, int CheckMode = 1, int NeihborMode = 0);

int main()
{
	Mat SrcImage = imread("11.png");
	namedWindow("原圖", 2);
	imshow("原圖", SrcImage);
	int height = SrcImage.rows;
	int width = SrcImage.cols;
	//cout << height << " " << width <<endl;

	//指標訪問陣列
	for (int i = 0; i < height; i++)
	{
		for (int j = 0; j < width; j++)
		{
			//取出圖片第i行第j列的畫素
			uchar *p = SrcImage.ptr<uchar>(i,j);
			if (i == j)  //當i=j時 將畫素賦值為紅色
			{
				p[0] = 0;
				p[1] = 0;
				p[2] = 255;
			}
		}
	}
	namedWindow("處理圖", 1);
	imshow("處理圖", SrcImage);
	waitKey(0);
	return 0;
}
 

結果顯示：