OpenCV绘图函数

OpenCV几个绘图函数

 

矩形

rectangle(Mat& img,Point pt1, Point pt2, const Scalar&color, int thickness=1,int lineType=8, int shift=0)

rectangle(Mat& img,Rect rec, const Scalar&color, int thickness=1, int lineType=8,int shift=0)

intthickness为-1 则填充矩形   lineType线形

 

线

line(Mat& img, Point pt1,Point pt2, const Scalar& color, int thickness=1, int lineType=8,int shift=0)

 

圆

circle(Mat&img, Point center, int radius, const Scalar&color,int thickness=1, intl ineType=8, int shift=0)

center圆心  radius半径 

 

椭圆

ellipse(Mat& img, Point center,Size axes, double angle, double startAngle, double endAngle, const Scalar& color,int thickness=1, int lineType=8, int shift=0)

axes:横竖大小, angle旋转角度

 

折线

polylines(Mat& img, const Point** pts, const int* npts, int ncontours, bool isClosed, const Scalar& color, int thickness=1, int lineType=8, int shift=0 )

 

文字

void putText(Mat& img, const string& text, Point org, int fontFace, double fontScale, Scalar color, int thickness=1, int lineType=8, bool bottomLeftOrigin=false )

test文字 org左下坐标 

 

例子:

---------

/*
绘图
*/
#include <cv.h>
#include <highgui.h>
#include <math.h>

using namespace cv;
using namespace std;

int main(int argc, char **argv)
{
    Mat canvas(400,400,CV_8UC3,Scalar(255,255,255));
    
    line(canvas, Point(10,10),Point(100,10),Scalar(0), 1, 8);
    line(canvas, Point(10,20),Point(200,20),Scalar(50), 2, 4);
    line(canvas, Point(10,40),Point(300,30),Scalar(100,200,255), 3, 2);
    line(canvas, Point(10,80),Point(400,40),Scalar(200), 4, 1);
    
    rectangle(canvas, Rect(Point(0,200),Point(40,280)),Scalar(0,0,255),-1,8);
    rectangle(canvas, Rect(Point(40,200),Point(80,280)),Scalar(0,255,0),4,8);
    rectangle(canvas, Rect(Point(80,200),Point(120,280)),Scalar(255,255,0),8,8);
    
    circle(canvas, Point(50,50),10, Scalar(0,0,255),2);
    circle(canvas, Point(300,100),5, Scalar(0,255,0),3);
    circle(canvas, Point(250,350),15, Scalar(255,0,0),4);        
    ellipse(canvas, Point(50,300),Size(20,10),0,0,300,Scalar(255,0,255),5);
    
    putText(canvas,"(50,50)",Point(50,50),1,1,Scalar(0));
    putText(canvas,"(300,100)",Point(300,100),1,1,Scalar(0));
    putText(canvas,"(250,350)",Point(250,350),1,1,Scalar(0));
    putText(canvas,"(50,300)",Point(50,300),1,1,Scalar(0));
    
    Point ps[1][5];
    ps[0][0] = Point(50,50);
    ps[0][1] = Point(300,100);
    ps[0][2] = Point(250,350);
    ps[0][3] = Point(50,300);            
    const Point* pts[1]={ps[0]};
    int pn[1]={4};
    polylines(canvas,pts,pn,1,true,Scalar(0));
    
    namedWindow("canvas", CV_WINDOW_AUTOSIZE);
    imshow("canvas", canvas);
    waitKey(0);
    
    return 0; 
}

 

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end