cmake error the source does not appear to contain CMakeLists txt

Question

I m installing opencv in ubuntu 16 04  After installing the necessary prerequisites I used the following command -  kvs Hunter   opencv contrib  mkdir build kvs Hunter   opencv contrib  cd build kvs Hunter   opencv contrib build   kvs Hunter   opencv contrib build  cmake -D CMAKE BUILD TYPE RELEASE -D CMAKE INSTALL PREFIX  usr local -D INSTALL C EXAMPLES ON -D INSTALL PYTHON EXAMPLES ON -D OPENCV EXTRA MODULES PATH   opencv contrib modules -D BUILD EXAMPLES ON      but it produced an error -  CMake Error  The source directory   home kvs opencv contrib  does not appear to contain CMakeLists txt  Specify --help for usage  or press the help button on the CMake GUI    I used the command provided in the folder  module  documentation  How do I solve it  I tried the answers here at stack-overflow and a few other question but still can t figure it out   Project Git repository here

User · Answer

This reply may be late but it may help users having similar problem. The opencv-contrib (available at https://github.com/opencv/opencv_contrib/releases) contains extra modules but the build procedure has to be done from core opencv (available at from https://github.com/opencv/opencv/releases) modules.

Follow below steps (assuming you are building it using CMake GUI)

Download openCV (from https://github.com/opencv/opencv/releases) and unzip it somewhere on your computer. Create build folder inside it
Download exra modules from OpenCV. (from https://github.com/opencv/opencv_contrib/releases). Ensure you download the same version.
Unzip the folder.
Open CMake
Click Browse Source and navigate to your openCV folder.
Click Browse Build and navigate to your build Folder.
Click the configure button. You will be asked how you would like to generate the files. Choose Unix-Makefile from the drop down menu and Click OK. CMake will perform some tests and return a set of red boxes appear in the CMake Window.
Search for "OPENCV_EXTRA_MODULES_PATH" and provide the path to modules folder (e.g. /Users/purushottam_d/Programs/OpenCV3_4_5_contrib/modules)
Click Configure again, then Click Generate.
Go to build folder

# cd build
# make
# sudo make install

This will install the opencv libraries on your computer.

User · Answer

Since you add    after cmake  it will jump up and up  just like cd     in the directory  But if you want to run cmake under the same folder with CMakeLists txt  please use   instead of

User · Answer

You should do mkdir build and cd build while inside opencv folder  not the opencv-contrib folder  The CMakeLists txt is there

[python] cmake error 'the source does not appear to contain CMakeLists.txt'

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