opencv坐标系确定笔记

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#include <iostream>#include <opencv2/core/core.hpp>#include <opencv2/highgui/highgui.hpp>#include<opencv2/imgproc/imgproc.hpp>#include<memory>using namespace std;using namespace cv;int main(){    shared_ptr<Mat> image=make_shared<Mat>();    image->create(Size(256, 500), CV_8UC1);    cout<<"c:"<<image->cols<<endl;    image->setTo(0);    ellipse( *image.get(), Point( 10, 100 ), Size( 5, 5 ), 0, 0, 360, Scalar( 255), 2, 8 );    ellipse( *image.get(), Point( 20, 100 ), Size( 5, 5 ), 0, 0, 360, Scalar( 100), 2, 8 );    shared_ptr<Mat>  image_3c=make_shared<Mat>();    image_3c->create(Size(256, 600), CV_8UC3);   //3通道的图像    image_3c->setTo(255);    ellipse( *image_3c.get(), Point( 50, 100 ), Size( 5, 5 ), 0, 0, 360, Scalar( 0,255,0), 2, 8 );//green    ellipse( *image_3c.get(), Point( 100, 50 ), Size( 5, 5 ), 0, 0, 360, Scalar( 0,0,255), 2, 8 );//red    imshow("image", *image.get());    imshow("image_3c", *image_3c.get());    waitKey(0);    return 0;}

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