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;
}

Screen Shot 2014-11-27 at 11.05.07 PM

OpenCV
CH01 簡介CH02 OpenCV APICH03 繪圖CH04 應用範例CH06 haarcascadesCH06 surf和siftCH07 OCRCH09 FaceCH5 輪廓(findContours、drawContours)