我写了一个像这样的简单程序
#include <opencv2/opencv.hpp>
using namespace cv;
int main(int argc, const char* argv[])
{
Mat input = imread(argv[1], 0); //Load as grayscale
//~ FAST detector;
//~ vector<KeyPoint> keypoints;
//~ FAST(input, keypoints, 0.2);
// Add results to image and save.
//~ Mat output;
//~ drawKeypoints(input, keypoints, output);
namedWindow ("Image", CV_WINDOW_FREERATIO);
imshow("Image", input);
//~ imwrite(argv[2], output);
return 0;
}
然后编译这样的程序:
g++ `pkg-config --libs opencv` main.cpp
这是g++
的输出:
/tmp/ccK1Sbrw.o: In function `main':
main.cpp:(.text+0x66): undefined reference to `cv::imread(std::string const&, int)'
main.cpp:(.text+0xc2): undefined reference to `cv::namedWindow(std::string const&, int)'
main.cpp:(.text+0xf6): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
main.cpp:(.text+0x139): undefined reference to `cv::imshow(std::string const&, cv::_InputArray const&)'
/tmp/ccK1Sbrw.o: In function `cv::Mat::~Mat()':
main.cpp:(.text._ZN2cv3MatD2Ev[_ZN2cv3MatD5Ev]+0x39): undefined reference to `cv::fastFree(void*)'
/tmp/ccK1Sbrw.o: In function `cv::Mat::release()':
main.cpp:(.text._ZN2cv3Mat7releaseEv[_ZN2cv3Mat7releaseEv]+0x47): undefined reference to `cv::Mat::deallocate()'
collect2: error: ld returned 1 exit status
我安装了库,我可以在其文件夹中看到* .so和* .hpp文件,ld
找到它们,但它有什么抱怨? .so文件中没有任何内容?!
另外,我没有安装非自由模块(我使用apt-get
来安装opencv),我怎么能得到它们?我需要在该模块内部的SIFT。我是否必须自己编译opencv?
答案 0 :(得分:1)
在我看来,你忘了在
中指定一个模块`pkg-config --libs MODULENAMEGOESHERE`