连接opencv库的麻烦

Question

我刚刚开始使用OpenCV。我有一个Raspberry Pi和Pi相机，我想学习OpenCV以用于机器视觉项目。我正在使用vi编写C代码，在Raspberry Pi上编写。我对Linux有点新鲜，在编辑器中编写代码而不是在IDE中是绝对新的！

我能够从Github上下载OpenCV仓库并编译它，而不麻烦。 OpenCV（3.2.0）已安装。

我开始按照这里的教程：http://docs.opencv.org/2.4/doc/tutorials/introduction/linux_gcc_cmake/linux_gcc_cmake.html#linux-gcc-usage

我输入正确的密码，然后取得了CMake的文件。

这里是我的CMakeLists.txt文件：

cmake_minimum_required(VERSION 2.8) 
project(DisplayImage) 
find_package(OpenCV COMPONENTS core imgproc highgui REQUIRED) 
add_executable(DisplayImage DisplayImage.cpp) 
target_link_libraries(DisplayImage ${OpenCCV_LIBS}) 
LINK_DIRECTORIES("/usr/local/lib") 

我试图使该项目，但它似乎有错误链接库。我是新手，无法确定它是否是版本冲突，库缺失，或者只是链接器正在寻找错误位置的库。

下面是当make命令由输出：

pi@raspberrypi:~/Programming $ cmake . 
-- Found OpenCV: /usr/local (found version "3.2.0") found components:   core imgproc highgui 
-- Configuring done 
-- Generating done 
-- Build files have been written to: /home/pi/Programming 
pi@raspberrypi:~/Programming $ make 
[ 50%] Linking CXX executable DisplayImage 
CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o: In function `main': 
DisplayImage.cpp:(.text+0x6c): undefined reference to `cv::imread(cv::String const&, int)' 
DisplayImage.cpp:(.text+0xd4): undefined reference to `cv::namedWindow(cv::String const&, int)' 
DisplayImage.cpp:(.text+0x118): undefined reference to `cv::imshow(cv::String const&, cv::_InputArray const&)' 
DisplayImage.cpp:(.text+0x138): undefined reference to `cv::waitKey(int)' 
CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o: In function `cv::String::String(char const*)': 
DisplayImage.cpp:(.text._ZN2cv6StringC2EPKc[_ZN2cv6StringC5EPKc]+0x50): undefined reference to `cv::String::allocate(unsigned int)' 
CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o: In function `cv::String::~String()': 
DisplayImage.cpp:(.text._ZN2cv6StringD2Ev[_ZN2cv6StringD5Ev]+0x14): undefined reference to `cv::String::deallocate()' 
CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o: In function `cv::String::operator=(cv::String const&)': 
DisplayImage.cpp: (.text._ZN2cv6StringaSERKS0_[_ZN2cv6StringaSERKS0_]+0x30): undefined reference to `cv::String::deallocate()' 
CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o: In function `cv::Mat::~Mat()': 
DisplayImage.cpp:(.text._ZN2cv3MatD2Ev[_ZN2cv3MatD5Ev]+0x3c): undefined reference to `cv::fastFree(void*)' 
CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o: In function `cv::Mat::operator=(cv::Mat const&)': 
DisplayImage.cpp:(.text._ZN2cv3MataSERKS0_[_ZN2cv3MataSERKS0_]+0x140): undefined reference to `cv::Mat::copySize(cv::Mat const&)' 
CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o: In function `cv::Mat::release()': 
DisplayImage.cpp:(.text._ZN2cv3Mat7releaseEv[_ZN2cv3Mat7releaseEv]+0x68): undefined reference to `cv::Mat::deallocate()' 
collect2: error: ld returned 1 exit status 
CMakeFiles/DisplayImage.dir/build.make:94: recipe for target 'DisplayImage' failed 
make[2]: *** [DisplayImage] Error 1 
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/DisplayImage.dir/all' failed 
make[1]: *** [CMakeFiles/DisplayImage.dir/all] Error 2 
Makefile:83: recipe for target 'all' failed 
make: *** [all] Error 2 
pi@raspberrypi:~/Programming $ 

下一步是什么？在Linux中对链接错误进行故障排除的过程是什么？/ OpenCV 您可以提供的任何见解都将不胜感激！

Answer 1

一些东西......

• 您已经在CMakeLists.txt

• 拼写错误OpenCVV_LIBS我想你也需要include_directories(${OpenCV_INCLUDE_DIR})

• 我觉得乱源建立是首选，这意味着您创建一个名为build的子目录，但不在版本控制下，但在目录中含CMakeLists.txt，cd build然后cmake ..