blocks|key|2909597|text|您需要正确地包含头文件-I+(大写i)和库-l+(小写L)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2909598|在最新的OpenCV版本上，您应该执行以下操作：|2909599|#include+<cv.h>
#include+<highgui.h>|code-block|syntax|javascript|2909600|然后尝试使用以下命令进行编译：|2909601|g%2B%2B+m.cpp+-o+app+`pkg-config+--cflags+--libs+opencv`|2909602|注意:如果在命令行中只执行pkg-config+--cflags+--libs+opencv，您将看到需要包含在g%2B%2B命令行中的路径和库。|2909603|entityMap^0|B|2|L|2|0|0|0|0|0|D|X|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|S|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|T|$]]

You need to properly include the headers <code>-I</code> (capital i) and libraries <code>-l</code> (lowercase L).

On the newest OpenCV versions you should do:

<pre><code>#include &lt;cv.h&gt;
#include &lt;highgui.h&gt;
</code></pre>

And then try to compile it with:

<pre><code>g++ m.cpp -o app `pkg-config --cflags --libs opencv`
</code></pre>

Note: if you execute only <code>pkg-config --cflags --libs opencv</code> in the command line you will see the paths and libraries you need to include in the g++ command line.

blocks|key|2909622|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2909623|下载OpenCV文件夹和install-opencv.sh脚本中的源文件。|ordered-list-item|offset|length|2909624|通过运行脚本文件，您可以自动安装opencv所需的文件。运行以下代码：|2909625|2909626|chmod+%2Bx安装-opencv.sh+./install-opencv.sh|2909627|如果您安装了不同版本的库，请更新安装脚本中的第一行版本。有关更多信息，请使用this教程。用下一行代码编译它：|2909628|g%2B%2B+`pkg-config+--cflags+opencv`+example.cpp+`pkg-config+--libs+opencv`|code-block|syntax|javascript|2909629|entityMap|0|LINK|mutability|MUTABLE|url|https://opencv.org/releases.html|1|2|http://www.daslhub.org/unlv/wiki/doku.php?id=opencv_install_ubuntu^0|0|2|6|0|C|H|1|0|0|0|0|12|4|2|0|0^^$0|@$1|2|3|-4|4|5|6|12|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|13|7|@]|8|@$D|14|E|15|1|16]|$D|17|E|18|1|19]]|9|$]]|$1|F|3|G|4|C|6|1A|7|@]|8|@]|9|$]]|$1|H|3|-4|4|5|6|1B|7|@]|8|@]|9|$]]|$1|I|3|J|4|5|6|1C|7|@]|8|@]|9|$]]|$1|K|3|L|4|5|6|1D|7|@]|8|@$D|1E|E|1F|1|1G]]|9|$]]|$1|M|3|N|4|O|6|1H|7|@]|8|@]|9|$P|Q]]|$1|R|3|-4|4|5|6|1I|7|@]|8|@]|9|$]]]|S|$T|$4|U|V|W|9|$X|Y]]|Z|$4|U|V|W|9|$X|Y]]|10|$4|U|V|W|9|$X|11]]]]

<ol>
<li>Download source files in <a href="https://opencv.org/releases.html" rel="nofollow noreferrer">OpenCV</a> folder and
<a href="https://opencv.org/releases.html" rel="nofollow noreferrer">install-opencv.sh</a> script. </li>
<li>By running script file you
automatically install needed files for opencv. Run the following
code:

<pre><code>chmod +x install-opencv.sh
./install-opencv.sh
</code></pre></li>
</ol>

In case if you install different version of the library please update the first line of version inside the installation script.
For more information use <a href="http://www.daslhub.org/unlv/wiki/doku.php?id=opencv_install_ubuntu" rel="nofollow noreferrer">this</a> tutorial. Compile it with the next line:

<pre><code>g++ `pkg-config --cflags opencv` example.cpp `pkg-config --libs opencv`
</code></pre>

blocks|key|243046|text|我建议你用CMake和G%2B%2B一起编译OpenCV，我觉得这种方式更合适。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|243047|cmake_minimum_required(VERSION+3.1)
project(YOUR_PROJECT_NAME)

set(CMAKE_GXX_FLAGS+"-Wall+-Wextra+-Wconversion++-pedantic+-std=gnu11")

find_package(OpenCV+REQUIRED)

include_directories(${OpenCV_INCLUDE_DIRS})

add_executable(YOUR_EXCUTABLE+YOUR_CODE_SOURCE_FILES)
target_link_libraries(YOUR_EXCUTABLE+${OpenCV_LIBS})|code-block|syntax|javascript|243048|entityMap^0|B|3|I|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

I suggest you use CMake to compile <code>OpenCV</code> with <code>G++</code>, this way is more suitable, I think.

<pre><code>cmake_minimum_required(VERSION 3.1)
project(YOUR_PROJECT_NAME)

set(CMAKE_GXX_FLAGS "-Wall -Wextra -Wconversion -pedantic -std=gnu11")

find_package(OpenCV REQUIRED)

include_directories(${OpenCV_INCLUDE_DIRS})

add_executable(YOUR_EXCUTABLE YOUR_CODE_SOURCE_FILES)
target_link_libraries(YOUR_EXCUTABLE ${OpenCV_LIBS})
</code></pre>

blocks|key|3124026|text|我认为公认的答案有点陈旧。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3124027|至少对于今天最新发布的OpenCV+4.X，您可以使用：|3124028|#include+<opencv2/opencv.hpp>|code-block|syntax|javascript|3124029|并通过如下方式编译您的程序：|3124030|g%2B%2B+your_program_file.cpp+-o+your_program+`pkg-config+--cflags+--libs+opencv4`|3124031|注意opencv4，而不仅仅是opencv。|offset|length|style|CODE|3124032|例如，使用上面的命令编译以下your_program_file.cpp文件：|3124033|#include+<opencv2/opencv.hpp>

int+main()+{

++++std::cout+<<+"The+current+OpenCV+version+is+"+<<+CV_VERSION+<<+"\n";

++++return+0;

}|3124034|和运行：|3124035|./your_program+|3124036|输出：|3124037|The+current+OpenCV+version+is+4.4.0|3124038|这确实与我当前的OpenCV设置相匹配。|3124039|entityMap^0|0|0|0|0|0|2|7|F|6|0|E|L|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1B|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|1C|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|1D|8|@$O|1E|P|1F|Q|R]|$O|1G|P|1H|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1I|8|@$O|1J|P|1K|Q|R]]|9|@]|A|$]]|$1|U|3|V|5|F|7|1L|8|@]|9|@]|A|$G|H]]|$1|W|3|X|5|6|7|1M|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|F|7|1N|8|@]|9|@]|A|$G|H]]|$1|10|3|11|5|6|7|1O|8|@]|9|@]|A|$]]|$1|12|3|13|5|F|7|1P|8|@]|9|@]|A|$G|H]]|$1|14|3|15|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|16|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]]|17|$]]

I think that the accepted answer is a bit old.
At least for OpenCV 4.X, the most recently release today, you can use:
<pre><code>#include &lt;opencv2/opencv.hpp&gt;
</code></pre>
and compile your program by something like:
<pre><code>g++ your_program_file.cpp -o your_program `pkg-config --cflags --libs opencv4`
</code></pre>
Note <code>opencv4</code> and not only <code>opencv</code>.
For example, using the command above to compile the following <code>your_program_file.cpp</code> file:
<pre><code>#include &lt;opencv2/opencv.hpp&gt;

int main() {

 std::cout &lt;&lt; &quot;The current OpenCV version is &quot; &lt;&lt; CV_VERSION &lt;&lt; &quot;\n&quot;;

 return 0;

}
</code></pre>
And running:
<pre><code>./your_program 
</code></pre>
Outputs:
<pre><code>The current OpenCV version is 4.4.0
</code></pre>
Which indeed matches with my current OpenCV settings.

i have a file with only import:

<pre><code>#include &lt;iostream&gt;
#include &lt;stdio.h&gt;

#include "cxcore.hpp"
#include "highgui.hpp"

using namespace cv;
using namespace std;

int main( int argc, char** argv )
{

}
</code></pre>

and i try to compile with g++ -I/usr/include/opencv -lopencv -lm m.cpp

but get whit error:

<blockquote>
 In file included from /usr/include/opencv/cxcore.hpp:46,
 from m.cpp:5:
 /usr/include/opencv/cxmisc.h:214: error: expected constructor, destructor, or type conversion before ‘void’
 /usr/include/opencv/cxmisc.h:220: error: expected constructor, destructor, or type conversion before ‘int’
 /usr/include/opencv/cxmisc.h:226: error: ‘CV_INLINE’ does not name a type
 /usr/include/opencv/cxmisc.h:516: error: ‘CV_DEPTH_MAX’ was not declared in this scope
 /usr/include/opencv/cxmisc.h:522: error: ‘CV_DEPTH_MAX’ was not declared in this scope
 /usr/include/opencv/cxmisc.h:522: error: ‘CV_CN_MAX’ was not declared in this scope
 In file included from m.cpp:5:
 /usr/include/opencv/cxcore.hpp:70: error: template declaration of ‘cv::CV_EXPORTS cv::Size_’
 /usr/include/opencv/cxcore.hpp:71: error: template declaration of ‘cv::CV_EXPORTS cv::Point_’
 /usr/include/opencv/cxcore.hpp:72: error: template declaration of ‘cv::CV_EXPORTS cv::Rect_’
 /usr/include/opencv/cxcore.hpp:77: error: expected initializer before ‘fromUtf16’
 /usr/include/opencv/cxcore.hpp:78: error: expected initializer before ‘toUtf16’
 /usr/include/opencv/cxcore.hpp:80: error: expected initializer before ‘format’
 /usr/include/opencv/cxcore.hpp:82: error: expected initializer before ‘:’ token
 m.cpp:38: error: expected ‘}’ at end of input
</blockquote>

this is my copencv lib content:

<pre><code>alberto@zefiro:~$ ls /usr/include/opencv/
cvaux.h cvcompat.h cv.hpp cvtypes.h cvvidsurv.hpp cxcore.h cxerror.h cxmat.hpp cxoperations.hpp highgui.h ml.h
cvaux.hpp cv.h cvinternal.h cvver.h cvwimage.h cxcore.hpp cxflann.h cxmisc.h cxtypes.h highgui.hpp
</code></pre>

i'm on ubuntu 10.10

compiling opencv in c++

我有一个只有import的文件：#include <iostream>#include <stdio.h>#include "cxcore.hpp"#include "highgui.hpp"using namespace cv;using namespace std;int main( int argc, char*...

问在c++中编译opencv
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