Opencv2--像素點操作（加噪聲）

// ReadPixels.cpp : Defines the entry point for the console application.
/*-----CODE FOR FUN---------------
-------CREATED BY Dream_Whui------
-------2015-3-9-------------------------*/  
//在原始圖像上加白色噪點

#include "stdafx.h"
#include<opencv2\opencv.hpp>
using namespace cv;

void Salt(Mat &image, int n)
{
    for(int k=0; k<n; k++)
    {
        int i = rand() % image.cols;
        int j = rand() % image.rows;
        if( image.channels() ==1 )
            image.at<uchar>(j,i) = 255;//白色
        else if(image.channels() == 3)
        {
            image.at<Vec3b>(j,i)[0] = 255;
            image.at<Vec3b>(j,i)[1] = 255;
            image.at<Vec3b>(j,i)[2] = 255;
        }
    }
}

int _tmain(int argc, _TCHAR* argv[])
{
    Mat image = imread("pic.jpg");
    Salt(image,3000);
    namedWindow("image");
    imshow("image",image);
    waitKey();
    return 0;
}