How to use opencv 3 with opencv_contrib

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there are actually 3 relevant folders here,

1. the sourcefolder. this is where CmakeLists.txt is. in your case it is the "sources" folder, and it is admittedly confusing, that it looks different from https://github.com/itseez/opencv

2. the build folder. this can be anywhere on your machine, you need ~2.5gb free disk space for the temporary build files, and you can remove it later, once everything is ok

3. the install folder. this is , where the final libs, dlls and include files end up. you specify it with cmake -DCMAKE_INSTALL_PREFIX

please make sure, you use latest opencv master version (3.1, atm.)

so, as an example, create a build folder, say, d:\mybuild, run cmake from that folder, set the install prefix to d:\opencv\final, and the last cmake argument should be the path to d:\opencv\sources

finally, don't forget to adjust the PATH, so it points to your newly build dlls, not the old, prebuilt ones !