我已经安装了OpenCV。 我已经能够编译一些代码,但有时它不起作用。下面的例子不起作用。OpenCV - 只使用g ++。不是gcc或nvcc
#include <iostream>
#include "opencv2/opencv.hpp"
#include "opencv2/gpu/gpu.hpp"
int main (int argc, char* argv[])
{
try
{
cv::Mat src_host = cv::imread("building.jpg", CV_LOAD_IMAGE_GRAYSCALE);
cv::gpu::GpuMat dst, src;
src.upload(src_host);
cv::gpu::threshold(src, dst, 128.0, 255.0, CV_THRESH_BINARY);
cv::Mat result_host = dst;
cv::imshow("Result", result_host);
cv::waitKey();
}
catch(const cv::Exception& ex)
{
std::cout << "Error: " << ex.what() << std::endl;
}
return 0;
}
我收到以下错误,当我与
GCC Test.cpp的$(pkg配置--cflags --libs OpenCV的)
gcc Test.cpp $(pkg-config --cflags --libs opencv)
Undefined symbols for architecture x86_64:
"std::allocator<char>::allocator()", referenced from:
_main in ccnzUIww.o
"std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)", referenced from:
_main in ccnzUIww.o
"std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()", referenced from:
_main in ccnzUIww.o
"std::terminate()", referenced from:
_main in ccnzUIww.o
"std::allocator<char>::~allocator()", referenced from:
_main in ccnzUIww.o
"cv::gpu::GpuMat::upload(cv::Mat const&)", referenced from:
_main in ccnzUIww.o
"cv::gpu::Stream::Null()", referenced from:
_main in ccnzUIww.o
"cv::gpu::threshold(cv::gpu::GpuMat const&, cv::gpu::GpuMat&, double, double, int, cv::gpu::Stream&)", referenced from:
_main in ccnzUIww.o
"cv::gpu::GpuMat::operator cv::Mat() const", referenced from:
_main in ccnzUIww.o
"___cxa_begin_catch", referenced from:
_main in ccnzUIww.o
"std::cout", referenced from:
_main in ccnzUIww.o
"std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)", referenced from:
_main in ccnzUIww.o
"std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)", referenced from:
_main in ccnzUIww.o
"std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))", referenced from:
_main in ccnzUIww.o
"___cxa_end_catch", referenced from:
_main in ccnzUIww.o
"std::ios_base::Init::Init()", referenced from:
__static_initialization_and_destruction_0(int, int)in ccnzUIww.o
"std::ios_base::Init::~Init()", referenced from:
___tcf_0 in ccnzUIww.o
"cv::gpu::GpuMat::release()", referenced from:
cv::gpu::GpuMat::~GpuMat()in ccnzUIww.o
"___gxx_personality_v0", referenced from:
Dwarf Exception Unwind Info (__eh_frame) in ccnzUIww.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
编译我自己也尝试:
- GCC Test.cpp的$(pkg配置--cflags --libs OpenCV的)-m32
- GCC Test.cpp的$(pkg配置--cflags --libs OpenCV的)-m64
- NVCC Test.cpp的$(pkg配置--cflags --libs OpenCV的)
但是,这也给错误。我已经找到了stackoverflow上的答案,并发现这一点。 Compiling OpenCV CUDA program 在这个答案的解决方案是使用这个命令:
g++ Test.cpp `pkg-config --cflags --libs opencv` -lopencv_gpu
和它的作品!我曾尝试给gcc和nvcc编译器提供相同的参数,但后来再次出现错误。这是一个问题,因为我需要使用nvcc编译器,因为我想在CUDA项目中使用OpenCV。
我有C和C++的小经验,所以有可能,这是明显的东西:)
OpenCV的是C++,你的例子程序,绝对是C++,*不* C.它编译用C编译器没有意义。它可以用gcc来完成,但是它无缘无故地为你完成额外的工作。 – Flexo
谢谢!但我需要使用nvcc编译器,因为将来我可以在该文件中添加一些CUDA代码。 –
然后使用'nvcc'编译并'g ++'链接。 – Flexo