OpenCV绘图

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:

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/*
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(,,CV_8UC3,Scalar(,,));

    line(canvas, Point(,),Point(,),Scalar(), , );
    line(canvas, Point(,),Point(,),Scalar(), , );
    line(canvas, Point(,),Point(,),Scalar(,,), , );
    line(canvas, Point(,),Point(,),Scalar(), , );

    rectangle(canvas, Rect(Point(,),Point(,)),Scalar(,,),-,);
    rectangle(canvas, Rect(Point(,),Point(,)),Scalar(,,),,);
    rectangle(canvas, Rect(Point(,),Point(,)),Scalar(,,),,);

    circle(canvas, Point(,),, Scalar(,,),);
    circle(canvas, Point(,),, Scalar(,,),);
    circle(canvas, Point(,),, Scalar(,,),);
    ellipse(canvas, Point(,),Size(,),,,,Scalar(,,),);

    putText(canvas,"(50,50)",Point(,),,,Scalar());
    putText(canvas,"(300,100)",Point(,),,,Scalar());
    putText(canvas,"(250,350)",Point(,),,,Scalar());
    putText(canvas,"(50,300)",Point(,),,,Scalar());

    Point ps[][];
    ps[][] = Point(,);
    ps[][] = Point(,);
    ps[][] = Point(,);
    ps[][] = Point(,);
    const Point* pts[]={ps[]};
    int pn[]={};
    polylines(canvas,pts,pn,,true,Scalar());

    namedWindow("canvas", CV_WINDOW_AUTOSIZE);
    imshow("canvas", canvas);
    waitKey();

    return ;
}

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end