c++ - 请帮我找出错误

Question

以下代码用于使用 Hough 变换检测线条。但是这段代码无法正常工作。它说“无法打开 pic1.png”。你能检查一下这段代码并告诉我这段代码有什么问题吗？请帮忙我。我正在使用 openCV 2.3 库和 visual studio 2010。谢谢。

  #include "opencv2/highgui/highgui.hpp"
  #include "opencv2/imgproc/imgproc.hpp"
  #include"cv.h"
  #include"cxcore.h"
  #include"stdafx.h"

  #include <iostream>

using namespace cv;
using namespace std;

void help()
{
cout << "\nThis program demonstrates line finding with the Hough transform.\n"
        "Usage:\n"
        "./houghlines <image_name>, Default is pic1.png\n" << endl;
}

int main(int argc, char** argv)
{
const char* filename = argc >= 2 ? argv[1] : "pic1.png";

Mat src = imread(filename, 0);
if(src.empty())
{
    help();
    cout << "can not open " << filename << endl;
    return -1;
}

Mat dst, cdst;
Canny(src, dst, 50, 200, 3);
cvtColor(dst, cdst, CV_GRAY2BGR);

#if 0
vector<Vec2f> lines;
HoughLines(dst, lines, 1, CV_PI/180, 100, 0, 0 );

for( size_t i = 0; i < lines.size(); i++ )
{
    float rho = lines[i][0], theta = lines[i][1];
    Point pt1, pt2;
    double a = cos(theta), b = sin(theta);
    double x0 = a*rho, y0 = b*rho;
    pt1.x = cvRound(x0 + 1000*(-b));
    pt1.y = cvRound(y0 + 1000*(a));
    pt2.x = cvRound(x0 - 1000*(-b));
    pt2.y = cvRound(y0 - 1000*(a));
    line( cdst, pt1, pt2, Scalar(0,0,255), 3, CV_AA);
}
#else
vector<Vec4i> lines;
HoughLinesP(dst, lines, 1, CV_PI/180, 50, 50, 10 );
for( size_t i = 0; i < lines.size(); i++ )
{
    Vec4i l = lines[i];
    line( cdst, Point(l[0], l[1]), Point(l[2], l[3]), Scalar(0,0,255), 3, CV_AA);
}
#endif
imshow("source", src);
imshow("detected lines", cdst);

waitKey();

return 0;
}

Answer 1

它正在可执行文件运行的同一目录中寻找 pic1.png。

您需要将图像复制到同一目录或输入图像文件的路径(完整路径或相对路径)。