opencv对每个像素进行操作

#include "mainwindow.h"
#include <QApplication>
#include <iostream>
#include <string>
#include <stdio.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/opencv.hpp>

using namespace cv;

void salt(cv::Mat image, int n) {
    int i,j;
    for (int k=0; k<n; k++) {
        // rand()是随机数生成器
        i= std::rand()%image.cols;
        j= std::rand()%image.rows;
        if (image.type() == CV_8UC1) { // 灰度图像
            image.at<uchar>(j,i)= 255;
        } else if (image.type() == CV_8UC3) { // 彩色图像
            image.at<cv::Vec3b>(j,i)[0]= 255;
            image.at<cv::Vec3b>(j,i)[1]= 255;
            image.at<cv::Vec3b>(j,i)[2]= 255;
        }
    }
}
int main(int argc, char *argv[])
{

    Mat image; //
    image= imread("C:\\Users\\Administrator\\Desktop\\QTsucai\\result.jpg"); // 读取输入图像
    if(image.empty()){
        return 0;
    }
    salt(image,3000);
    namedWindow("Original Image");
    imshow("Original Image", image);
    waitKey(20);
    getchar();

    return 0;
}