1. void ellipse(InputOutputArray img, Point center, Size axes, double angle, double startAngle, double endAngle,
const Scalar& color, int thickness = 1, int lineType = LINE_8, int shift = 0);
ellipse函数将椭圆画到图像 lmg 上, 椭圆中心为点center,并且大小位于矩形 axes 内,椭圆旋转角度为 angle, 扩展的弧度从 0 度到 360 度,
图形颜色为 Scalar(x, y,z),线宽 (thickness)为 1,线型(lineType)为 8 (8 联通线型)。
2. void circle(InputOutputArray img, Point center, int radius, const Scalar& color, int thickness = 1, int lineType = LINE_8, int shift = 0);
img :表示输入的图像
center: 圆心坐标
radius: 圆的半径
color:Scalar类型,表示圆的颜色,例如蓝色为Scalar(255,0,0)
thickness:线的宽度
lineType:线的类型,(默认为8联通型)
#include<iostream> #include<opencv2/opencv.hpp> using namespace cv; using namespace std; #define WINDOW_NAME1 "绘制图1" #define WINDOW_NAME2 "绘制图2" #define WINDOW_WIDTH 600 //定义窗口大小 string image = "C:\\Users\\asus\\Pictures\\Saved Pictures\\123.jpg"; void DrawEllipse(Mat img, double angle); void DrawFi1ledCirc1e(Mat img, Point center); int main() { Mat atomImage = Mat::zeros(WINDOW_WIDTH, WINDOW_WIDTH, CV_8UC3); Mat rookImage = Mat::zeros(WINDOW_WIDTH, WINDOW_WIDTH, CV_8UC3); //绘制椭圆 DrawEllipse(atomImage, 90); DrawEllipse(atomImage, 0); DrawEllipse(atomImage, 45); DrawEllipse(atomImage, -45); //绘制圆心 DrawFi1ledCirc1e(atomImage, Point(WINDOW_WIDTH / 2,WINDOW_WIDTH / 2)); imshow(WINDOW_NAME1, atomImage); waitKey(0); return 0; } void DrawEllipse(Mat img, double angle) { int thickness = 2; int lineType = 8; ellipse(img, Point(WINDOW_WIDTH / 2, WINDOW_WIDTH / 2), Size(WINDOW_WIDTH / 4, WINDOW_WIDTH / 16), angle, 0, 360, Scalar(255, 129, 0), thickness, lineType); } void DrawFi1ledCirc1e(Mat img, Point center) { int thickness = -1; int lineType = 8; circle(img, center, WINDOW_WIDTH / 32, Scalar(0, 0, 255), thickness, lineType); }
总结
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详解opencv中画圆circle函数和椭圆ellipse函数
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