1、直线

2、圆形

3、椭圆

 

4、矩形

 

5、多边形

 

6、文字

//图形绘制
void test1()
{
	Mat img = Mat::zeros(Size(512, 512), CV_8UC3);//生成一个黑色图像用于绘制几何图形

	//绘制圆形
	circle(img, Point(50, 50), 25, Scalar(255, 255, 255), -1);//绘制一个实心圆
	circle(img, Point(100, 50), 20, Scalar(255, 255, 255), 4);//绘制一个空心圆

	//绘制直线
	line(img, Point(100, 100), Point(200, 100), Scalar(255, 255, 255), 2, LINE_4, 0);//绘制一条直线

	//绘制椭圆
	ellipse(img, Point(300, 255), Size(100, 70), 0, 0, 100, Scalar(255, 255, 255), -1);//绘制实心椭圆的

	//绘制矩形
	rectangle(img, Point(50, 400), Point(100, 450), Scalar(125, 125, 125), -1);

	//绘制多边形
	Point pp[2][6];
	pp[0][0] = Point(72, 200);
	pp[0][1] = Point(142, 204);
	pp[0][2] = Point(226, 263);
	pp[0][3] = Point(172, 310);
	pp[0][4] = Point(117, 319);
	pp[0][5] = Point(15, 260);
	pp[1][0] = Point(359, 339);
	pp[1][1] = Point(447, 351);
	pp[1][2] = Point(504, 349);
	pp[1][3] = Point(484, 433);
	pp[1][4] = Point(418, 449);
	pp[1][5] = Point(354, 402);
	Point pp2[5];
	pp2[0] = Point(350, 83);
	pp2[1] = Point(463, 90);
	pp2[2] = Point(500, 171);
	pp2[3] = Point(421, 194);
	pp2[4] = Point(338, 141);

	const Point* pts[3] = { pp[0], pp[1], pp2 }; //pts变量的生成
	int npts[] = { 6, 6, 5 }; //顶点个数数组的生成
	fillPoly(img, pts, npts, 3, Scalar(125, 125, 125), 8);//绘制3个多边形
	//生成文字
	putText(img, "Learn OpenCV 4", Point(100, 400), 2, 1, Scalar(255, 255, 255));
	imshow("", img);
    waitKey(0);
}

 7、ROI区域截取

 

 

 

//ROI区域截取
int test2()
{
	Mat img = imread("F:/testMap/lena.png");
	Mat noobev = imread("F:/testMap/OpenCV.png");
	if (img.empty() || noobev.empty())
	{
		cout << "请确认图像文件名称是否正确" << endl;
		return -1;
	}
	Mat ROI1,ROI2,ROI2_copy,mask,img2,img_copy; 
	resize(noobev, mask, Size(200, 200));
	img2 = img;//浅拷贝
	
	//深拷贝的两种方式
	img.copyTo(img_copy);
	//两种在图中截取ROI区域的方式
	Rect rect(206,206,200,200);//定义ROI区域
	ROI1 = img(rect);//截图
	ROI2 = img(Range(300,500),Range(300,500));//第二种截图方式

	img(Range(300,500),Range(300,500)).copyTo(ROI2_copy);//深拷贝
	mask.copyTo(ROI1);//在图像中加入部分图像
	imshow("加入noobcv后图像",img) ;
	imshow("深拷贝的img_copy", img_copy);
	imshow("ROI对ROI2的影响",ROI2);
	imshow("深拷贝的ROI2_copy", ROI2_copy);
	
	circle(img,Point(300,300),20,Scalar(0,0,255),-1);//绘制一个圆形
	
	imshow("浅拷贝的img2",img2);
	imshow("画圆对ROI1的影响",ROI1);
    waitKey(0);
}

8、高斯三角形

8.1 原理

 

8.2 实现

 

//高斯图像金字塔
void test3()
{
	Mat img = imread("F:/testMap/lena.png");
	vector<Mat> Guass;
	int level = 3;
	Guass.push_back(img);
	for (int i = 0; i < level; i++)
	{
		Mat guass;
		pyrDown(Guass[i], guass);
		Guass.push_back(guass);
	}
	for (int i = 0; i < level; i++)
	{
		string name = to_string(i);
		imshow(name, Guass[i]);
	}
    waitKey(0);
}