openCV 画矩形框或填充矩形

目录(?)[+]

rectangle：画矩形
Draws a simple, thick, or filled up-right rectangle.画一个简单或填充的矩形

C++: void rectangle(Mat& img, Point pt1, Point pt2, const Scalar& color, int thickness=1, int lineType=8,int shift=0)函数原型一

C++: void rectangle(Mat& img, Rect r, const Scalar& color, int thickness=1, int lineType=8, int shift=0)函数原型二
Python: cv2.rectangle(img, pt1, pt2, color[,
thickness[, lineType[, shift ]]])! None
C: void cvRectangle(CvArr* img, CvPoint pt1, CvPoint pt2, CvScalar color, int thickness=1, int line Type=8, int shift=0 )函数原型三

Python: cv.Rectangle(img, pt1, pt2, color, thickness=1, lineType=8, shift=0) !None
Parameters参数
img – Image.

pt1 – Vertex of the rectangle.

pt2 – Vertex of the recangle opposite to pt1 .

r – Alternative specification of the drawn rectangle.

color – Rectangle color or brightness (grayscale image).

thickness – Thickness of lines that make up the rectangle. Negative values, like CV_FILLED
, mean that the function has to draw a filled rectangle.

lineType – Type of the line. See the line() description.

shift – Number of fractional bits in the point coordinates.

The function rectangle draws a rectangle outline or a filled rectangle whose two opposite corners are pt1 and pt2,

or r.tl() and r.br()-Point(1,1).

 

 

方法一：

[cpp] view
plain copy

 





#include "stdafx.h"  

#include <string>  

#include <opencv2\opencv.hpp>  

#include "cv.h"  

#include "highgui.h"  

  

using namespace cv;  

using namespace std;  

  

int main()  

{  

 IplImage* img = cvLoadImage( "lena.jpg" );    

 // cvRectangle函数参数： 图片， 左上角， 右下角， 颜色， 线条粗细， 线条类型，点类型    

 cvRectangle( img, cvPoint(100, 100), cvPoint(200, 200), cvScalar(0, 0, 255), 3, 4, 0 );   

 cvNamedWindow( "donkeyaime", CV_WINDOW_AUTOSIZE );    

 cvShowImage( "donkeyaime", img );    

 cvWaitKey(0);    

 cvReleaseImage( &img );  

}  

 

 

方法二：

[cpp] view
plain copy

 





#include <string>  

#include <opencv2\opencv.hpp>  

#include "cv.h"  

#include "highgui.h"  

  

using namespace cv;  

using namespace std;  

  

Rect select;//声明矩形  

Point pt1;//点坐标1  

Point pt2;//点坐标2  

  

int main()  

{  

string imagename = "lena.jpg";   //此处需要填写绝对地址，我测试时使用相对地址出错。  

Mat img = imread(imagename);//读入图像  

  

select.x = 50;  

select.y = 50;  

select.width =100;  

select.height =100;  

  

pt1.x = 200;  

pt1.y = 200;  

pt2.x = 250;  

pt2.y = 250;  

    

rectangle(img,select,Scalar(0,0,255),3,8,0);//用矩形画矩形窗  

rectangle(img,pt1,pt2,Scalar(0,0,255),3,8,0);//用点画矩形窗  

namedWindow("image",1);   

imshow("image", img);  

waitKey(0);  

}  

  

   

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