CMake: CUDA libraries not found when compiling OpenCV

Question

I am compiling OpenCV 3.0.0 with CUDA support on Windows, using CMAKE. When I click \"configure\", errors occur as following:

CMake Error: The following variable         


        

Answer 1

For the Linux, I solved by these step:

(1) Check .so file in the lib folder,such as cuda7-cudnn3/lib64

(2) Make symlink like sudo ln -s libcublas.so.7.5.18 libcublas.so

For my case, I put correctly link in CMakeLists.txt and Makefile.config, but there wasn't a .so file.

Answer 2

it is really related to version!!! if you want to compile with Cuda, when you cmake opencv2413, you will notice the makefile will try to find some third-party libs for supporting more functions:

CUDA_TOOLKIT_ROOT_DIR C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v9.0

from that, I know I ever installed CUDA v9.0, but I still got this not found opencv_dep_CUDA_nppi_LIBRARY error, so I look for it in C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.0\lib\x64, I did can not get it whose name is nppi.lib,so just for a test, i create a empty file and name it nppi.lib,as I guess, I worked, but in fact, it was not enough, the test can not help compiling opencv,morever, I found I had CUDA v8, and suprisly, I got the lib nppi.lib in C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0\lib\x64; so I change my environment path,

CUDA_TOOLKIT_ROOT_DIR C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v8.0 then I reconfigured it. it worked!!

Answer 3

Thanks to tips from Drop in the comments, I solved this problem. In order to close this question, I'm answering my own question.

It's a "Win32 or x64" architecture problem. Since NVIDIA only provides cufft, nvblas, nppc, nppi, npps libs for x64, it's naturally impossible for CMAKE to find these libs for configuring a Win32 OpenCV library.

My solution was to choose Visual Studio 11 Win64 instead of Visual Studio 11 as generator in CMAKE. So that CMAKE will automatically load libs from <CUDA_DIR>\lib\x64 rather than <CUDA_DIR>\lib\Win32. Further more, I also need to load all the other libs required by OpenCV in 64 bit version, such as OpenGL. I will also need to compile OpenCV in x64 architecture. All the code I'm going to write in the future will have to build and debug in x64 only.

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Should one have no trouble reading Chinese materials, I'm happy to provide a link towards a post regarding the complete guide on building OpenCV 3.0 on VS2012 with CUDA supports.