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I know it's all described here, but it's not clear to me what and where exactly should I build this opencv_contrib source.

Let's assume I've installed OpenCV 3.2 from official download site and after extracting it looks like this:

enter image description here

Now, step two:

select the opencv source code folder and the folder where binaries will be built

which one is the source folder? Should I have it in my OpenCV installation folder or do I need to get it from somewhere else? And where should I build it? Is it, in my case, /Documents/OpenCV/opencv/build?

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3 Answers 3

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4

What I usually do is to build OpenCV from source directly but it should be more or less the same with the pre-built archive.

With CMake-gui tool:

  • where is the source code: the directory that contains the OpenCV source code and that contains the CMakeLists.txt file (in your case, the sources folder in the screenshot).
  • where to build the binaries: the directory of your choice (in your case the build directory or another directory if you want)
  • in CMake, the flag OPENCV_EXTRA_MODULES_PATH should point to the modules directory of the contrib source.
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4 Comments

Thanks, that's exactly how it should be described there
But, although build was finished succesfully, I can't find FaceRecognizer class which should be in opencv_contrib project. Do you know anything about it?
You can find cv::face::FaceRecognizer in the documentation.
Well explained answer!
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my build:

cd ~/opencv
mkdir build
cd build

cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules  .. 
make -j7
make install

../../opencv_contrib/modules is directory of contributed modules directory .. is opencv source root directory

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-1

The OpenCV official download doesn't come with the extra module. You need to download the zip file or clone it using git to your source directory from OpenCV repository, e.g. /Documents/OpenCV/opencv/opencv_contrib in your case. Then, in CMake, set OPENCV_EXTRA_MODULES_PATH points to /Documents/OpenCV/opencv/opencv_contrib/modules.

The FaceRecognizer is under the face module of the OpenCV Contribute.

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