少有人走的路在opencv\sources\samples下面提供了很多的官方例程，是学习OpenCV的最好的资源。
视频教程地址：
https://www.bilibili.com/video/av17748771/?p=8
感谢贾志刚老师的视频教程。
绘制形状
使用cv::Point与cv::Scalar
Point表示2D平面的一个点x,y
p = Point(10,8);
Scalar表示四个元素的向量
Scalar(a,b,c); //a=blue,b=green,c=red表示RGB三个通道
绘制线 cv::line(LINE_4\LINE_8\LINE_AA)
画椭圆 cv::ellipse
画矩形 cv::rectangle
画圆 cv::circle
画填充 cv::fillPoly
绘制文本
putText(src,”Hello girl”,Point(0,145),CV_FONT_HERSHEY_COMPLEX,1.0,Scalar(255,0,255),2,8);
代码
#include<iostream>
#include<opencv2/core/core.hpp>
#include<highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <math.h>
using namespace cv;
using namespace std;
void MyLines(Mat bg_img);
void MyRectangle(Mat bg_img);
void MyEllipse(Mat bg_img);
void MyCircle(Mat bg_img);
void MyPolygon(Mat bg_img);
void MyRandomDemo(Mat bg_img);
int main()
{
Mat src;
Mat src2;
src = imread("1.jpg");
char input_win[] = "input image";
namedWindow(input_win,CV_WINDOW_AUTOSIZE);
imshow(input_win,src);
src.copyTo(src2);
MyLines(src);
MyRectangle(src);
MyEllipse(src);
MyCircle(src);
MyPolygon(src);
putText(src,"Hello girl",Point(0,145),CV_FONT_HERSHEY_COMPLEX,1.0,Scalar(255,0,255),2,8);
namedWindow("out1",CV_WINDOW_AUTOSIZE);
imshow("out1",src);
MyRandomDemo(src2);
waitKey(0);
return 0;
}
void MyLines(Mat bg_img)
{
Point p1 = Point(20,30);
Point p2;
p2.x = 300;
p2.y = 300;
Scalar color = Scalar(0,0,255);
line(bg_img,p1,p2,color,1,8,0);
}
void MyRectangle(Mat bg_img)
{
Rect rect = Rect(30,20,140,130); //起始坐标和长宽
Scalar color = Scalar(255,0,0);
rectangle(bg_img,rect,color,2,8);
}
void MyEllipse(Mat bg_img)
{
ellipse(bg_img,Point(bg_img.cols/2,bg_img.rows/2),Point(bg_img.cols/4,bg_img.rows/8),45,0,360,Scalar(0,255,0),2,8);
}
void MyCircle(Mat bg_img)
{
circle(bg_img,Point(bg_img.cols/2,bg_img.rows/2),60,Scalar(0,255,0),2,8);
}
void MyPolygon(Mat bg_img)
{
Point pts[1][5];
pts[0][0] = Point(30,30);
pts[0][1] = Point(30,60);
pts[0][2] = Point(60,60);
pts[0][3] = Point(60,30);
pts[0][4] = Point(30,30);
const Point *ppts[] = {pts[0]};
int npt[] = {5};
fillPoly(bg_img,ppts,npt,1,Scalar(0,255,255),8);
}
void MyRandomDemo(Mat bg_img)
{
RNG rng(12345); //生成随机数
Point pt1;
Point pt2;
namedWindow("out3",CV_WINDOW_AUTOSIZE);
Mat bg = Mat::zeros(bg_img.size(),bg_img.type());
for(int i = 0;i<10000;i++){
pt1.x = rng.uniform(0,bg_img.cols);
pt1.y = rng.uniform(0,bg_img.rows);
pt2.x = rng.uniform(0,bg_img.cols);
pt2.y = rng.uniform(0,bg_img.rows);
Scalar color = Scalar(rng.uniform(0,255),rng.uniform(0,255),rng.uniform(0,255));
if(waitKey(50) > 0){
break;
}
line(bg_img,pt1,pt2,color,1,8);
imshow("out3",bg_img);
}
}效果演示
源码和原图片请到Github下载:
https://github.com/MRwangmaomao/OpencvDrawTest-Project.git
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版权声明：本文为CSDN博主「南山二毛」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/qq_16481211/article/details/79566200
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