環(huán)境： opensuse?? opencv3.4.1??? 交叉編譯器arm-openwrt-linux? 作者：帥得不敢出門

https://github.com/opencv/opencv/tree/3.4.1

選擇右邊的"clone or download"按鈕進(jìn)行下載，選擇下載zip

我下的是opencv-3.4.1.zip, 3.4.1的版本號(hào)

https://github.com/opencv/opencv_contrib

下載,因?yàn)檫@個(gè)相對(duì)會(huì)小些，所以我選擇git直接下載，大家可以下載3.4.1的zip的包,版本要與opencv的版本一致就行,下zip會(huì)快些

git clone https://github.com/opencv/opencv_contrib

與opencv同一文件夾下

解壓

然后cd opencv-3.4.1

編譯pc端的：

mkdir build && cd build

編譯

cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules/ ../

如果要編譯python3的請(qǐng)?jiān)赾make 后面加-D BUILD_opencv_python3=ON

make -j4

出錯(cuò)：

opencv-3.4.1/modules/python/src2/cv2.cpp:14:10: fatal error: numpy/ndarrayobject.h: 沒有那個(gè)文件或目錄

#include

compilation terminated.

出錯(cuò)：

-- Could NOT find JNI (missing: JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)

-- Could NOT find Matlab (missing: MATLAB_MEX_SCRIPT MATLAB_INCLUDE_DIRS MATLAB_ROOT_DIR MATLAB_LIBRARIES MATLAB_LIBRARY_DIRS MATLAB_MEXEXT MATLAB_ARCH MATLAB_BIN)

-- VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file

-- Looking for dlerror in dl

-- Looking for dlerror in dl - found

-- Caffe:?? NO

-- Protobuf:?? NO

-- Glog:?? NO

CMake Error at /home/zm/下載/opencv_contrib/modules/datasets/CMakeLists.txt:5 (ocv_append_source_files_cxx_compiler_options):

Unknown CMake command "ocv_append_source_files_cxx_compiler_options".

這是因?yàn)閛pen_contrib版本與opencv版本不一致導(dǎo)致，進(jìn)入open_contrib源碼目錄，執(zhí)行g(shù)it checkout 3.4.1,或者官網(wǎng)下載open_contrib.3.4.1.zip

解決方法：

安裝python2-numpy-devel

編譯成功后安裝

sudo make install

編譯arm端 :

cp platforms/linux/arm-gnueabi.toolchain.cmake platforms/linux/arm-openwrt.toolchain.cmake

編輯platforms/linux/arm-openwrt.toolchain.cmake

因?yàn)槲业慕徊婢幾g器前綴是xx

set(GNU_MACHINE "arm-linux-gnueabi" CACHE STRING "GNU compiler triple")

改成

set(GNU_MACHINE "arm-openwrt-linux" CACHE STRING "GNU compiler triple")

mkdir build_openwrt

cd build_openwrt

cmake -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules -DCMAKE_INSTALL_PREFIX=./install -DCMAKE_TOOLCHAIN_FILE="../platforms/linux/arm-openwrt.toolchain.cmake" -DCMAKE_CXX_FLAGS="-DTBB_USE_GCC_BUILTINS=1 -D__TBB_64BIT_ATOMICS=0 -mcpu=cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4"? -DSOFTFP=ON -DWITH_OPENCL=OFF -DWITH_TBB=ON? -DWITH_V4L=ON -DHAVE_CAMV4L2=ON -DENABLE_VFPV3=ON -DENABLE_NEON=ON -DBUILD_TESTS=OFF -DINSTALL_PYTHON_EXAMPLES=OFF -DBUILD_EXAMPLES=OFF -DCMAKE_BUILD_TYPE=Release -DWITH_FFMPEG=ON -DHAVE_FFMPEG=ON ../

#-D FFMPEG_INCLUDE_DIR="/home/zengming/download/ffmpeglib/include" -D FFMPEG_LIB_DIR="/home/zengming/download/fmpeglig/lib" ../

如果不加-DSOFTFP=ON有可能會(huì)出現(xiàn)找不到交叉編譯器的情況

-- The CXX compiler identification is GNU 7.3.1

-- The C compiler identification is GNU 7.3.1

-- Check for working CXX compiler: /usr/bin/c++

-- Check for working CXX compiler: /usr/bin/c++ -- broken

CMake Error at /usr/share/cmake/Modules/CMakeTestCXXCompiler.cmake:45 (message):

The C++ compiler

"/usr/bin/c++"

開始編譯

make -j4

make install

總結(jié)

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