OpenCV基础课程笔记04Mat常用方法

代码

#include<iostream>
#include<opencv2/opencv.hpp>
using namespace std;
using namespace cv;

int main() {
	Mat src = imread("A:专用\\TestForTheCV\\class4酷酷.jpg");
	if (src.empty()) {
		cout << "No file!" << endl;
	}
	else {
		imshow("kuku", src);
	}

	//统一赋值
	Mat dst = Mat(src.size(), src.type());
	dst = Scalar(155, 56, 255);
	imshow("output", dst);

	//克隆
	Mat dst = Mat(src.size(), src.type());
	dst = src.clone();
	Mat dst2;
	src.copyTo(dst2);
	cvtColor(dst2, dst2, CV_BGR2GRAY);
	imshow("output", dst);
	imshow("output2", dst2);
	cout << "output channel:" << dst.channels() << endl << "output2 channel:" << dst2.channels() << endl;


	//创建一个带色的mat
	Mat M = Mat(100, 100, CV_8UC3, Scalar(0, 0, 255));  //行、列、8位无符号3通道、像素向量
	imshow("M", M);

	//创建一个渐变图
	Mat m = Mat(255, 200, CV_8UC1, Scalar(150));
	for (int i = 0; i < 255; i++) {
		uchar* current = m.ptr<uchar>(i);
		for (int j = 0; j < 200; j++) {
			current[j] = i;
		}
	}
	imshow("m", m);

	//对角线为1的矩阵
	Mat duijiaoxian = Mat::eye(23, 23,CV_8UC1);
	cout << duijiaoxian;
	imshow("对角线", duijiaoxian);


	waitKey(0);
	return 0;
}

运行结果

统一赋值

克隆

创建一个带色的Mat

创建一个渐变图（这个是自己写着玩）

对角线为1的矩阵