ubuntu-编译安装支持CUDA的OpenCV
终端运行
cmake-gui
配置源码
点击”configure”按钮，会显示很多配置项：
对于以上出现的错误项，事先下载好，配置再.cache文件夹下即可，
同时事先下载好opencv的第三方库extra。继续点击“configure”按钮：
如果需要Python编译，就修改一些Python编译的选项。
以上红色信息是由OPENVB_GENERATE_STATUS该选项勾选造成的，可以去掉，也可以忽略。可以勾选掉java等选项，继续点击”configure”,
可以配置OpenCV的Python编译环境、安装路径 prefix等，点击”configure“按钮，
直到需要的选项，没有出现红色的行为止：
然后点击 “Generate”按钮，即可。
这时候进入build路径，启动终端，点击”make“,
编译过程中，有可能会出现以下错误：
这是因为在编译过程中，有可能环境变量没有配置完成：
配置环境变量的方法有两种，
一种是在/etc/profile文件中，配置LD_LIBRARY_PATH的值。
/usr/local/cuda-10.1/lib64:/usr/local/opencv/lib:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/home/pytorch/anaconda3/lib:
特别要注意/lib/x86_64-linux-gnu 和 /usr/lib/x86_64-linux-gnu，
如果需要python编译，而环境是由Anaconda环境搭建，那么一定要配置/home/pytorch/anaconda3/lib
一种是配置/etc/ld.so.conf，然后利用命令 ldconfig，将其缓存到/etc/ld.so.cache中去。
记录一些细节：
1：出现的红色提示信息，可以通过去掉 OPENCV_GENERATE_SETUPVARS的勾选框，默认是勾选的，
去掉勾选框即可：
2：有必要生成 OPENVB_GENERATE_PKGCONFIG，这样就可以使用PKG_CONFIG命令了，勾选此选项：
3：出现了一下错误：
/home/pytorch/anaconda3/lib/libpng16.so.16: undefined reference to `inflateValidate@ZLIB_1.2.9'collect2: error: ld returned 1 exit statusmodules/world/CMakeFiles/opencv_perf_superres.dir/build.make:124: recipe for target 'bin/opencv_perf_superres' failedmake[2]: *** [bin/opencv_perf_superres] Error 1CMakeFiles/Makefile2:2744: recipe for target 'modules/world/CMakeFiles/opencv_perf_superres.dir/all' failedmake[1]: *** [modules/world/CMakeFiles/opencv_perf_superres.dir/all] Error 2Makefile:160: recipe for target 'all' failedmake: *** [all] Error 2(base) pytorch@pytorch-MS-7C22:~/Gram/softWare/opencv-4.3.0-build$ pip install --upgrade libpngCollecting libpngERROR: Could not find a version that satisfies the requirement libpng (from versions: none)ERROR: No matching distribution found for libpng(base) pytorch@pytorch-MS-7C22:~/Gram/softWare/opencv-4.3.0-build$ pip install libpngCollecting libpngERROR: Could not find a version that satisfies the requirement libpng (from versions: none)ERROR: No matching distribution found for libpng(base) pytorch@pytorch-MS-7C22:~/Gram/softWare/opencv-4.3.0-build$ pip install l(base) pytorch@pytorch-MS-7C22:~/Gram/softWare/opencv-4.3.0-build$ sudo apt-get install libpng16-16[sudo] password for pytorch:Reading package lists... DoneBuilding dependency treeReading state information... DoneThe following packages were automatically installed and are no longer required:fonts-mathjax javascript-common libboost-python1.58.0 libboost-thread1.58.0libcublas7.5 libcudart7.5 libcufft7.5 libcufftw7.5 libcuinj64-7.5libcurand7.5 libcusolver7.5 libcusparse7.5 libjs-jquery libjs-mathjaxlibjs-sphinxdoc libjs-underscore liblapack3 libnppc7.5 libnppi7.5 libnpps7.5libnvblas7.5 libnvrtc7.5 libnvtoolsext1 libnvvm3 libthrust-dev libvdpau-devnvidia-cuda-doc nvidia-cuda-gdb nvidia-opencl-dev nvidia-profilernvidia-visual-profiler opencl-headers python-pycuda-doc python3-appdirspython3-decorator python3-numpy python3-pytoolsUse 'sudo apt autoremove' to remove them.The following NEW packages will be installed:libpng16-160 upgraded, 1 newly installed, 0 to remove and 1 not upgraded.Need to get 172 kB of archives.After this operation, 415 kB of additional disk space will be used.Get:1 http://cn.archive.ubuntu.com/ubuntu xenial/universe amd64 libpng16-16 amd64 1.6.20-2 [172 kB]Fetched 172 kB in 1s (100 kB/s)Selecting previously unselected package libpng16-16:amd64.(Reading database ... 251701 files and directories currently installed.)Preparing to unpack .../libpng16-16_1.6.20-2_amd64.deb ...Unpacking libpng16-16:amd64 (1.6.20-2) ...Processing triggers for libc-bin (2.23-0ubuntu11) .../sbin/ldconfig.real: /usr/local/cuda-10.1/targets/x86_64-linux/lib/libcudnn.so.7 is not a symbolic linkProcessing triggers for doc-base (0.10.7) ...Processing 1 added doc-base file...Setting up libpng16-16:amd64 (1.6.20-2) ...Processing triggers for libc-bin (2.23-0ubuntu11) .../sbin/ldconfig.real: /usr/local/cuda-10.1/targets/x86_64-linux/lib/libcudnn.so.7 is not a symbolic link
解决方法：
在终端输入
sudo apt-get install libpng16-16
重新进行
make
然后顺利编译通过
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