Ubuntu16.04下安装Opencv3.2.0
1.下载opencv3.2.0安装包，进入官网： http://opencv.org/releases.html，选择 3.2.0 版本的 source , 下载 opencv-3.2.0.zip。
2.安装opencv需要的一些库，能安装的尽量都安装上：
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 --assume-yes libopencv-dev libdc1394-22 libdc1394-22-dev libjpeg-dev libpng12-dev libtiff5-dev libjasper-dev libavcodec-dev libavformat-dev libswscale-dev libxine2-dev libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev libv4l-dev libtbb-dev libqt4-dev libfaac-dev libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev libvorbis-dev libxvidcore-dev x264 v4l-utils unzip
sudo apt-get install ffmpeg libopencv-dev libgtk-3-dev python-numpy python3-numpy libdc1394-22 libdc1394-22-dev libjpeg-dev libpng12-dev libtiff5-dev libjasper-dev libavcodec-dev libavformat-dev libswscale-dev libxine2-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libv4l-dev libtbb-dev qtbase5-dev libfaac-dev libmp3lame-dev libopencore-amrnb-dev
sudo apt-get install libgtk-3-dev
sudo apt-get -y install libgstreamer-plugins-base1.0-dev
sudo apt-get -y install libgstreamer1.0-dev
sudo apt-get -y install libavresample-dev
sudo apt-get -y install libgphoto2-dev
sudo apt-get install libopenblas-dev
sudo apt-get install doxygen
3.将安装包放在根目录下，进行解压，再执行命令：
cd opencv-3.2.0
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D CUDA_GENERATION=Kepler ..
sudo make -j124.错误解决：
- 问题1：ICV: Downloading ippicv_linux_20151201.tgz下载卡住，超时
解决：手动下载：ippicv_linux_20151201.tgz
载完后替换opencv-3.2.0/3rdparty/ippicv/downloads/linux-*目录下的同名文件，重新cmake。
- 问题2：出现以下错误，原因是cuda9不再支持2.0架构
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
CUDA_nppi_LIBRARY (ADVANCED)
linked by target "opencv_cudev" in directory D:/Cproject/opencv/opencv/sources/modules/cudev
linked by target "opencv_cudev" in directory D:/Cproject/opencv/opencv/sources/modules/cudev
linked by target "opencv_test_cudev" in directory D:/Cproject/opencv/opencv/sources/modules/cudev/test
linked by target "opencv_core" in directory D:/Cproject/opencv/opencv/sources/modules/core
linked by target "opencv_core" in directory D:/Cproject/opencv/opencv/sources/modules/core
linked by target "opencv_test_core" in directory D:/Cproject/opencv/opencv/sources/modules/core
linked by target "opencv_perf_core" in directory D:/Cproject/opencv/opencv/sources/modules/core
linked by target "opencv_test_cudaarithm" in directory D:/Cproject/opencv/opencv/sources/modules/cudaarithm
linked by target "opencv_cudaarithm" in directory D:/Cproject/opencv/opencv/sources/modules/cudaarithm
linked by target "opencv_cudaarithm" in directory D:/Cproject/opencv/opencv/sources/modules/cudaarithm
linked by target "opencv_perf_cudaarithm" in directory D:/Cproject/opencv/opencv/sources/modules/cudaarithm
linked by target "opencv_flann" in directory D:/Cproject/opencv/opencv/sources/modules/flann
linked by target "opencv_flann" in directory D:/Cproject/opencv/opencv/sources/modules/flann
linked by target "opencv_test_flann" in directory D:/Cproject/opencv/opencv/sources/modules/flann
.
.
.
linked by target "opencv_traincascade" in directory D:/Cproject/opencv/opencv/sources/apps/traincascade
linked by target "opencv_createsamples" in directory D:/Cproject/opencv/opencv/sources/apps/createsamples
linked by target "opencv_annotation" in directory D:/Cproject/opencv/opencv/sources/apps/annotation
linked by target "opencv_visualisation" in directory D:/Cproject/opencv/opencv/sources/apps/visualisation
linked by target "opencv_version" in directory D:/Cproject/opencv/opencv/sources/apps/version
解决：按照以下步骤改完之后，重新cmake
1.找到/home/xxx/opencv-3.2.0/cmake下的FindCUDA.cmake文件：
将：
find_cuda_helper_libs(nppi)
改为：
find_cuda_helper_libs(nppial)
find_cuda_helper_libs(nppicc)
find_cuda_helper_libs(nppicom)
find_cuda_helper_libs(nppidei)
find_cuda_helper_libs(nppif)
find_cuda_helper_libs(nppig)
find_cuda_helper_libs(nppim)
find_cuda_helper_libs(nppist)
find_cuda_helper_libs(nppisu)
find_cuda_helper_libs(nppitc)
----------------------------------
将：
set(CUDA_npp_LIBRARY "${CUDA_nppc_LIBRARY};${CUDA_nppi_LIBRARY};${CUDA_npps_LIBRARY}")
改为：
set(CUDA_npp_LIBRARY "${CUDA_nppc_LIBRARY};${CUDA_nppial_LIBRARY};${CUDA_nppicc_LIBRARY};${CUDA_nppicom_LIBRARY};${CUDA_nppidei_LIBRARY};${CUDA_nppif_LIBRARY};${CUDA_nppig_LIBRARY};${CUDA_nppim_LIBRARY};${CUDA_nppist_LIBRARY};${CUDA_nppisu_LIBRARY};${CUDA_nppitc_LIBRARY};${CUDA_npps_LIBRARY}")
---------------------------------
将：
unset(CUDA_nppi_LIBRARY CACHE)
改为：
unset(CUDA_nppial_LIBRARY CACHE)
unset(CUDA_nppicc_LIBRARY CACHE)
unset(CUDA_nppicom_LIBRARY CACHE)
unset(CUDA_nppidei_LIBRARY CACHE)
unset(CUDA_nppif_LIBRARY CACHE)
unset(CUDA_nppig_LIBRARY CACHE)
unset(CUDA_nppim_LIBRARY CACHE)
unset(CUDA_nppist_LIBRARY CACHE)
unset(CUDA_nppisu_LIBRARY CACHE)
unset(CUDA_nppitc_LIBRARY CACHE)
2.找到/home/xxx/opencv-3.2.0/cmake下的OpenCVDetectCUDA.cmake文件：
将：
...
set(__cuda_arch_ptx "")
if(CUDA_GENERATION STREQUAL "Fermi")
set(__cuda_arch_bin "2.0")
elseif(CUDA_GENERATION STREQUAL "Kepler")
set(__cuda_arch_bin "3.0 3.5 3.7")
elseif(CUDA_GENERATION STREQUAL "Maxwell")
set(__cuda_arch_bin "5.0 5.2")
...
改为：
...
set(__cuda_arch_ptx "")
if(CUDA_GENERATION STREQUAL "Kepler")
set(__cuda_arch_bin "3.0 3.5 3.7")
elseif(CUDA_GENERATION STREQUAL "Maxwell")
set(__cuda_arch_bin "5.0 5.2")
...3.找到/home/xxx/opencv-3.2.0/opencv/modules/cudev/include/opencv2/cudev下的common.hpp文件：
添加：
#include - 问题3：fatal error: LAPACKE_H_PATH-NOTFOUND/lapacke.h: No such file or directory #include “LAPACKE_H_PATH-NOTFOUND/lapacke.h”
解决：
sudo apt-get install liblapacke-dev checkinstall修改opencv-3.2.0/build/opencv_lapack.h：
将：
#include"LAPACKE_H_PATH-NOTFOUND/lapacke.h"
改为：
#include"lapacke.h"- 问题4：nvcc fatal : Unsupported gpu architecture 'compute_20'
解决：
运行以下语句可以解决，[注] ：..不能少：
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D CUDA_GENERATION=Kepler ..应该不会出错。
- 问题5：videodev.h————linux/videodev.h not found
解决：
sudo ln -s /usr/include/libv4l1-videodev.h /usr/include/linux/videodev.h
成功结果：
5.编译成功后进行安装：
sudo make install成功结果：
6.安装完成后通过查看 opencv 版本验证是否安装成功：
pkg-config --modversion opencv成功结果：
3.2.0
7.重新make caffe
更改Makefile.config文件中的配置
将：
#OPENCV_VERSION := 3
改为：
OPENCV_VERSION := 3 由于已经make过所以先执行：
sudo make clean在执行：
sudo make all -j12成功后执行：
sudo make runtest -j12其中出现了错误：
.build_release/tools/caffe: error while loading shared libraries: libopencv_core.so.3.2: cannot open shared object file: No such file or directory
解决：
先：
cat /etc/ld.so.conf由于我没有在/etc/ld.so.conf文件中添加过什么路径，因此这里只有系统配置的路径，会有以下返回结果：
include /etc/ld.so.conf.d/*.conf我们想要系统能够查找到我们自己的链接库，只用在这个目录下新建个自己的conf文件就行了：
sudo echo "/usr/local/lib" >> sudo /etc/ld.so.conf或者直接添加 /usr/local/lib到/etc/ld.so.conf：
vi /etc/ld.so.conf之后运行：
sudo ldconfig最后一步：
sudo make runtest -j12结果：
