01 cvLine，畫線

openCV 的畫線指令cvLine

openCV 的畫線指令

void cvLine(CvArr* img, CvPoint pt1, CvPoint pt2, CvScalar color, int thickness=1, int line_type=8, int shift=0 )

參數:

• img – Image.


• pt1 – First point of the line segment.


• pt2 – Second point of the line segment.


• color – Line color.


• thickness – Line thickness.


• lineType – Type of the line: 8 (or omitted) – 8-connected line. 4 – 4-connected line. CV_AA – antialiased line.


• shift – Number of fractional bits in the point coordinates.

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/opencv.hpp>
#include <iostream>
#include <string.h>
#include <fstream>
using namespace cv;
int main(int argc,char **argv)

 int width,height;
 if(argc<=1)
 
 std::cout<<"Error:Please Load a picture!"<<std::endl;
 return 0;
 

 IplImage *image;
 //建立視窗
 namedWindow("image",CV_WINDOW_AUTOSIZE);

 //讀取圖片
 image=cvLoadImage(argv[1]);
 width=image->width;
 height=image->height;

 //畫出紅線
 cvLine(image, cvPoint((width/4),(height/4)),
 cvPoint((width/4)*3,(height/4)*3),
 CV_RGB(255,0,0),3,CV_AA,1);
 //畫出綠線
 cvLine(image,cvPoint((width/4)*1,(height/4)*3),
 cvPoint((width/4)*3,(height/4)),
 CV_RGB(0,255,0),3,CV_AA,1);

 cvShowImage("image",image);
 waitKey(0);

 cvDestroyAllWindows();
 cvReleaseImage(&image);
 system("pause");
 return 0;

01 cvLine，畫線