Linux无root权限安装opencv

opencv下载：https://opencv.org/releases/
opencv_contrib-3.4.1.tar下载：
https://blog.csdn.net/weijifen000/article/details/87904707

tar -zxvf opencv-3.4.1.tar.gz
cd opencv-3.4.1
mkdir build
cd build
cmake -D BUILD_opencv_cudacodec=OFF -D CMAKE_BUILD_TYPE=RELEASE -D WITH_TBB=ON -D WITH_V4L=ON -D BUILD_TIFF=ON -D BUILD_EXAMPLES=OFF -D BUILD_DOCS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_TESTS=OFF -D WITH_OPENGL=ON -D WITH_EIGEN=ON -D WITH_CUBLAS=ON -D OPENCV_EXTRA_MODULES_PATH=/home/zhanghaoyu/library/opencv_contrib-3.4.1/modules -D CMAKE_INSTALL_PREFIX=/home/zhanghaoyu/cmake/ ..
make -j4
make install

ps：cmake时要修改最后2处的路径。

****bug1：opencv2/xfeatures2d/cuda.hpp: No such file or directory

/usr/local/arm/opencv-3.4.0/opencv_contrib-3.4.0/modules/xfeatures2d/include/opencv2/xfeatures2d.hpp:42:10: 
fatal error: /opencv2/xfeatures2d.hpp: No such file or directory

解决：根据给的路径找到xfeature2d.hpp的文件并打开，找到第42行如下：

42 #include"/opencv2/xfeatures2d.hpp"

改为绝对路径

42#include"/home/zhanghaoyu/library/opencv_contrib-3.4.1/modules/xfeatures2d/include/opencv2/xfeatures2d.hpp"

所有这种找不到的都这么解决。

bug2：缺少boostdesc_bgm.i等文件
对于boostdesc_bgm.i的问题直接下载到拟需要的文件夹。

opencv_contrib/modules/xfeatures2d/src/

百度云盘链接

链接：https://pan.baidu.com/s/1GbXsTFGG9eBGNyRx6V-5vQ 
提取码：66j8

验证：

pkg-config --cflags opencv

直接验证会报bug：

Package opencv was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opencv' found

是缺失了opencv.pc这个配置信息文件，故解决方法就是添加这个文件然后将其导入到环境变量中，具体操作如下：
首先创建opencv.pc文件，这里要注意它的路径信息：

cd /yourpath/lib  #你自己路径下的lib文件夹，与cmake命令CMAKE_INSTALL_PREFIX的路径对应
mkdir pkgconfig
cd pkgconfig
touch opencv.pc

然后在opencv.pc中添加以下信息，注意这些信息需要与自己安装opencv时的库路径对应：

prefix=/usr/local    #与cmake命令CMAKE_INSTALL_PREFIX的路径对应
exec_prefix=${prefix}
includedir=${prefix}/include
libdir=${exec_prefix}/lib

Name: opencv
Description: The opencv library
Version:3.4.1
Cflags: -I${includedir}/opencv3
Libs: -L${libdir} -lopencv_shape -lopencv_stitching -lopencv_objdetect -lopencv_superres -lopencv_videostab -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_video -lopencv_photo -lopencv_ml -lopencv_imgproc -lopencv_flann  -lopencv_core        

保存退出，然后将文件导入到环境变量：

export  PKG_CONFIG_PATH=/usr/local/lib/pkgconfig    #与上面配置的路径对应

再次验证pkg-config --cflags opencv出现下图成功：