如何在OpenCV4.1和cmake中使用OpenCL优化

问题描述

我需要运行具有不同优化功能的c ++项目：OPENMP，NEON和OpenCL。我试图在OpenCV上设置所有必要的cmake标志，但OpenCL不起作用。我对此进行了测试：

cv::ocl::setUSEOpenCL(true);
        if  ( ! cv::ocl::haveOpenCL ())
                cout  <<  "OpenCL IS NOT available ..."  <<  endl ;
        else
                cout  <<  "OpenCL IS avaiable ..."  <<  endl ;

我用过：

RaspBerry Pi 3B with Raspbian 9 stretch
gcc 6.3.0 
cmake 3.7.2
OpenCV 4.1.0

我的cmake标志是：

cmake -D CMAKE_BUILD_TYPE=RELEASE
-D CMAKE_INSTALL_PREFIX=/usr/local
-D BUILD_opencv_java=off
-D BUILD_opencv_python2=OFF
-D BUILD_opencv_python3=OFF 
-D ENABLE_precompiled_HEADERS=OFF 
-D ENABLE_FAST_MATH=ON 
-D CMAKE_SHARED_LINKER_FLAGS=-latomic 
-D ENABLE_NEON=ON 
-D ENABLE_VFPV3=ON 
-D OPENCV_ENABLE_NONFREE=ON 
-D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules 
-D WITH_OPENCL=ON 
-D WITH_PTHREADS_PF=OFF 
-D EXTRA_C_FLAGS=-mcpu=cortex-a53 -mfpu=neon-vfpv4 -ftree-vectorize -mfloat-abi=hard 
-D EXTRA_CXX_FLAGS=-mcpu=cortex-a53 -mfpu=neon-vfpv4 -ftree-vectorize -mfloat-abi=hard 
-D BUILD_EXAMPLES=OFF 
-D BUILD_PERF_TESTS=OFF 
-D WITH_OPENMP=ON ..

CMakeLists.txt：

cmake_minimum_required(VERSION 3.5.1)
set (CMAKE_BUILD_TYPE Release)
SET (CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
add_deFinitions(-std=c++0x)
project(river_flow_veLocity_estimation)
set( OpenCV_DIR "/usr/share/OpenCV" )
set(OPENCV_ENABLE_NONFREE "Enable non-free algorithms" ON)
find_package( OpenCV 4.1.0 required)
find_package( OpenMP required)
find_package( OpenCL 1.2 required ) # I tried also with EXACT but it doesn't find it
link_directories(${OpenCL_LIBRARY})
include_directories(include ${OpenCL_INCLUDE_Dirs} ${OpenCV_LIBRARIES} ${OpenCV_INCLUDE_Dirs} } ${catkin_INCLUDE_Dirs})

if (OpenCL_FOUND)
    message ("OpenCL FOUND")
endif()

if(OPENMP_FOUND)
    message ("OPENMP FOUND")
    set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS} -mcpu=cortex-a53 -mfloat-abi=hard -funsafe-math-optimizations -mfpu=neon-vfpv4")
    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS} -mcpu=cortex-a53 -mfloat-abi=hard -funsafe-math-optimizations -mfpu=neon-vfpv4")
    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
endif()

file(GLOB SOURCES "src/*.cpp")
add_executable(river_flow_veLocity_estimation ${SOURCES})
target_link_libraries(river_flow_veLocity_estimation ${OpenCL_LIBRARY} ${OpenCV_LIBS} ${catkin_LIBRARIES})

我认为问题在于版本，因为我发现OpenCV4.1.0包含OpenCL1.2（实际上我在这里拥有它：/home/pI/Opencv/3rdparty/include/opencl/1.2/CL/），但是当我在其中运行cmake ..时在项目的构建目录中，cmake将找到OpenCL2.0（在这里：/usr/lib/arm-linux-gnueabihf/libOpenCL.so）。我也尝试将/usr/lib/arm-linux-gnueabihf/文件放在目录libOpenCL.so.1.2中，但它没有考虑。

有人知道如何在OpenCV4中使用OpenCL吗？

解决方法

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c++cmake opencl opencv opencv4