python用函数绘制椭圆_详解opencv中画圆circle函数和椭圆ellipse函数

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

#include

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);

}

python用函数绘制椭圆_详解opencv中画圆circle函数和椭圆ellipse函数_第1张图片

总结

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