初识Opencv4.X----为图像添加椒盐噪声

//为图像添加椒盐噪声
#include <stdio.h>
#include <iostream>
#include <string>
#include <opencv2\opencv.hpp>
using namespace std;
using namespace cv;
void add_salt(Mat & img);
int main()
{
    
	//椒盐噪声，顾名思义就是在图像上撒上白色的盐和黑色的小黑椒
	Mat img = imread("person3.jpeg");//读取的是三通道图像
	namedWindow("原图", WINDOW_NORMAL);
	imshow("原图", img);
	for (int i = 0; i < img.cols*img.rows / 10; i++)
	{
    
		add_salt(img);
	}
	namedWindow("椒盐图", WINDOW_NORMAL);
	imshow("椒盐图", img);
	waitKey(0);
	return 0;
}
void add_salt(Mat & img)
{
    
	int x = std::rand() % img.cols;//得到增加噪点的列位置
	int y = std::rand() % img.rows;//得到增加噪点的行位置
	int select = std::rand() % 100;//与50比较用于决定是撒盐还是撒黑椒
	if (img.channels() == 3)
	{
    
		if (select >= 50)//撒盐
		{
    
			img.at<Vec3b>(y, x)[0] = 255;
			img.at<Vec3b>(y, x)[1] = 255;
			img.at<Vec3b>(y, x)[2] = 255;
		}
		else//撒黑椒
		{
    
			img.at<Vec3b>(y, x)[0] = 0;
			img.at<Vec3b>(y, x)[1] = 0;
			img.at<Vec3b>(y, x)[2] = 0;
		}
	}
	else//灰度图
	{
    
		if (select >= 50)//撒盐
		{
    
			img.at<float>(y, x) = 255;
		}
		else//撒黑椒
		{
    
			img.at<float>(y, x) = 0;
		}
	}
}