Ubuntu14联合安装opencv与opencv_contrib踩过的坑
1.下载好Opencv3.4.1与对应版本的Opencv_contrib3.4.1：
https://github.com/opencv
并把opencv_contrib文件放到opencv3.4.1文件夹下，并在这个文件夹下建立build文件夹
2.安装必要依赖项（虽然不知道干吗用的，不安装编译通不过，而且报莫名其妙的错误）：
sudo apt-get install build-essential
sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev
sudo apt-get install build-essential qt5-default ccache libv4l-dev libavresample-dev libgphoto2-dev libopenblas-base libopenblas-dev doxygen openjdk-8-jdk pylint libvtk6-dev
sudo apt-get install pkg-config
2.按照readme所述：
我安装在/opencv3.4.1/usr/下
cd build
cmake -DOPENCV_EXTRA_MODULES_PATH=/home/luoyongheng/opencv-3.4.1/opencv_contrib-3.4.1/modules -DCMAKE_INSTALL_PREFIX=/opencv3.4.1/usr/ ..
make -j163.各种报错：
a.cmake时候一直卡在下载项，自己去寻找对应的包，放到对应的位置，涉及到face_landmark_model.dat，ippicv，tiny_dnn
等，tiny_dnn这个github地址已失效，需要从csdn上下载，并修改对应的CNakeLists.txt文件。
b.如果出现报错：libopencv_highgui.so:undefined reference to `TIFFIsTiled@LIBTIFF_4.0'
sudo apt-get install libtiff4-dev
cmake -DOPENCV_EXTRA_MODULES_PATH=/home/luoyongheng/opencv-3.4.1/opencv_contrib-3.4.1/modules -DCMAKE_INSTALL_PREFIX=/opencv3.4.1/usr/ -DBUILD_TIFF=ON ..c.C++11支持报错，在报错的包中，添加C++11支持：
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")d.与内核有关的报错：
/tmp/cc8j8kGs.s: Assembler messages:
/tmp/cc8j8kGs.s:205: 错误： operand type mismatch for `vxorps'
/tmp/cc8j8kGs.s:278: 错误： no such instruction: `vextractf32x8 $0x1,%zmm7,%ymm0'
/tmp/cc8j8kGs.s:280: 错误： no such instruction: `vextractf32x8 $0x1,%zmm6,%ymm0'
/tmp/cc8j8kGs.s:284: 错误： no such instruction: `vextractf32x8 $0x1,%zmm6,%ymm0'
/tmp/cc8j8kGs.s:287: 错误： no such instruction: `vextractf32x8 $0x1,%zmm4,%ymm0'
/tmp/cc8j8kGs.s:289: 错误： no such instruction: `vextractf32x8 $0x1,%zmm6,%ymm2'
/tmp/cc8j8kGs.s:294: 错误： no such instruction: `vextractf32x8 $0x1,%zmm7,%ymm0'
/tmp/cc8j8kGs.s:296: 错误： no such instruction: `vextractf32x8 $0x1,%zmm1,%ymm0'
/tmp/cc8j8kGs.s:303: 错误： no such instruction: `vextractf32x8 $0x1,%zmm7,%ymm6'
/tmp/cc8j8kGs.s:307: 错误： no such instruction: `vextractf32x8 $0x1,%zmm6,%ymm5'
/tmp/cc8j8kGs.s:311: 错误： no such instruction: `vextractf32x8 $0x1,%zmm6,%ymm7'
/tmp/cc8j8kGs.s:313: 错误： no such instruction: `vextractf32x8 $0x1,%zmm2,%ymm6'
/tmp/cc8j8kGs.s:316: 错误： no such instruction: `vextractf32x8 $0x1,%zmm2,%ymm5'
/tmp/cc8j8kGs.s:633: 错误： operand type mismatch for `vxorps'
/tmp/cc8j8kGs.s:1048: 错误： operand type mismatch for `vxorps'
/tmp/cc8j8kGs.s:1394: 错误： operand type mismatch for `vxorps'
make[2]: *** [modules/dnn/CMakeFiles/opencv_dnn.dir/layers/layers_common.avx512_skx.cpp.o] 错误 1
make[1]: *** [modules/dnn/CMakeFiles/opencv_dnn.dir/all] 错误 2
make: *** [all] 错误 2
有人说需要在对应的报错包的cmakeLists.txt中添加32位编译支持：
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")结果是16线程编译的时候，本来在35%的地方报错，延迟到85%才报错，报错内容还是一样，单线程编译发现，还是dnn模块报错。折腾了很久还是没通过，最后，直接放弃编译dnn库和最后一个python库（依赖dnn）：
我的cmake版本是3.10，故意设置成3.12，从而跳过cmake编译
if(${CMAKE_VERSION} VERSION_LESS 3.12)
message(STATUS "Module opencv_dnn_modern disabled because CMake version is less than 3.12")
ocv_module_disable(dnn_modern)
return()
endif()e.安装
sudo make install 有空了再把那两个跳过的模块（dnn和python，它们都是opencv3.4.1本身就有的，不属于contrib）弄一下