openCV图像操作

openCV图像操作

读写图像

imread可以指定加载为灰度或者RGB图像
imwrite保存图形文件，类型由扩展名决定

读写像素

读一个GRAY像素点的像素值(CV_8UC1)

Scalar intensity=img.at<uchar>(y,x);

或者

Scalar intensity =img.at<uchar>(Point(x,y));

获取每一个像素的rgb值

代码

#include
#include
using namespace cv;
using namespace std;
int main()
{
	Mat a = imread("C:\\Users\\27507\\Desktop\\1.png");
	int height, width;
	//获取图片的宽度和高度
	height = a.rows;
	width = a.cols;
	for (int row = 0; row < height; row++)
	{
		for (int col = 0; col < width; col++)
		{
			int b = a.at<Vec3b>(row, col)[0];//blue
			int g = a.at<Vec3b>(row, col)[1]; //green
			int r = a.at<Vec3b>(row, col)[2];//red
			cout << b << " " << g << " " << r<<" ";
		}
	}
	namedWindow("output", WINDOW_AUTOSIZE);
	imshow("output", a);
	waitKey(0);
	return 0;
}