使用CMake 2.8 编译OpenCV 3.1.0 + opencv_contrib扩展 (环境ubuntu14.04 CUDA8.0)

软件下载：

1. opencv-3.1.0.zip
https://github.com/Itseez/OpenCV/archive/3.1.0.zip
2. opencv_contrib-3.1.0.zip

https://github.com/opencv/opencv_contrib/archive/3.1.0.zip

注意：所有权限问题不能执行的命令，一律在命令前加sudo

黄色亮底为输入的命令行，蓝色亮底为出现的错误

源库更新

sudo apt-get update
sudo apt-get upgrade

编译环境安装：

sudo apt-get install build-essential

必需包安装：

sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev

可选包安装：

sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev

编译opencv 3.1.0

在路径/usr/local文件夹中创建文件夹opencv310

cd /usr/local
mkdir opencv310

将文件opencv-3.1.0.zip复制到文件夹opencv310中

cp <文件所在路径>/opencv-3.1.0.zip /usr/local/opencv310/

解压文件opencv-3.1.0.zip

cd /usr/local/opencv310
unzip opencv-3.1.0.zip

如果CUDA版本是8.0,修改一下配置文件

gedit /usr/local/opencv310/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp

将代码

#if !defined (HAVE_CUDA) || defined (CUDA_DISABLER)

替换成

#if !defined (HAVE_CUDA) || defined (CUDA_DISABLER) || (CUDART_VERSION>=8000)

进入到解压好的opencv-3.1.0文件夹中

cd opencv-3.1.0/

创建build文件夹并进入

mkdir build
cd build

开始cmake

cmake -DCMAKE_BUILD_TYPE=Release –D CMAKE_INSTALL_PREFIX=/usr/local ..
这一步可能出现的问题：

ICV: Downloading ippicv_linux_20151201.tgz...
CMake Error at 3rdparty/ippicv/downloader.cmake:73 (file):
file DOWNLOAD HASH mismatch
for file: [/usr/local/opencv310/opencv-3.1.0/3rdparty/ippicv/downloads/linux-808b791a6eac9ed78d32a7666804320e/ippicv_linux_20151201.tgz]
expected hash: [808b791a6eac9ed78d32a7666804320e]
actual hash: [5368b733a8f4311edf31a4abc5474843]

解决方案：下载ippicv_linux_20151201.tgz失败，手动下载该文件，百度搜索文件名，或在该地址下载：http://download.csdn.net/download/lx928525166/9479919

将下载好的文件ippicv_linux_20151201.tgz拷贝到文件夹路径中：/usr/local/opencv310/opencv-3.1.0/3rdparty/ippicv/downloads/linux-808b791a6eac9ed78d32a7666804320e/

cp <文件所在路径>/ippicv_linux_20151201.tgz /usr/local/opencv310/opencv-3.1.0/3rdparty/ippicv/downloads/linux-808b791a6eac9ed78d32a7666804320e/

注意，在报错之前，系统不会创建该文件夹，报错之后系统会创建该文件夹用来存储ippicv_linux_20151201.tgz文件，但是下载失败，所以可以把手动下载的文件替换。

重新cmake

cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local ..

开始编译

make –j8

开始安装

make  install
/bin/bash -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'
sudo ldconfig
sudo gedit /etc/ld.so.conf.d/opencv.conf

加入路径/usr/local/lib保存

sudo ldconfig

设置环境变量

sudo gedit /etc/bash.bashrc

最后加入以下两行代码

PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
export PKG_CONFIG_PATH

编译opencv_contrib扩展

进入到文件夹opencv310

cd /usr/local/opencv310

将文件opencv_contrib-3.1.0.zip复制到文件夹opencv310中

cp <文件所在路径>/opencv_contrib-3.1.0.zip /usr/local/opencv310/
解压

unzip  opencv_contrib-3.1.0.zip

进入到解压好的opencv_contrib-3.1.0 文件夹中

cd opencv_contrib-3.1.0/

创建build文件夹并进入

mkdir build
cd build

开始cmake

Cmake -D OPENCV_EXTRA_MODULES_PATH=/usr/local/opencv310/opencv_contrib-3.1.0/modules/ /usr/local/opencv310/opencv-3.1.0/

这一步可能出现的问题1：

Downloading protobuf-cpp-3.1.0.tar.gz...
CMake Error at /usr/local/opencv310/opencv-3.1.0/cmake/OpenCVUtils.cmake:895 (file):
file DOWNLOAD HASH mismatch
for file: [/usr/local/opencv310/opencv_contrib-master/build/3rdparty/protobuf/downloads/bd5e3eed635a8d32e2b99658633815ef/protobuf-cpp-3.1.0.tar.gz]
expected hash: [bd5e3eed635a8d32e2b99658633815ef]
actual hash: [d41d8cd98f00b204e9800998ecf8427e]

解决方案：和前面一样，有一个文件下载失败，同样手动下载，百度搜索 protobuf-cpp-3.1.0.tar.gz，

放置的文件夹路径为/usr/local/opencv310/opencv_contrib-3.1.0/build/3rdparty/protobuf/downloads/bd5e3eed635a8d32e2b99658633815ef/

可能出现的问题2:

Downloading ...
CMake Error at /Users/Documents/opencv/source/opencv-3.2.0/cmake/OpenCVUtils.cmake:1045 (file):
file DOWNLOAD cannot open file for write.
Call Stack (most recent call first):
/Users/Documents/opencv/source/opencv_contrib-master/modules/dnn/cmake/OpenCVFindLibProtobuf.cmake:32 (ocv_download)
/Users/Documents/opencv/source/opencv_contrib-master/modules/dnn/CMakeLists.txt:5 (include)
CMake Error at /Users/Documents/opencv/source/opencv-3.2.0/cmake/OpenCVUtils.cmake:1049 (message):
Failed to download . Status=
Call Stack (most recent call first):
/Users/Documents/opencv/source/opencv_contrib-master/modules/dnn/cmake/OpenCVFindLibProtobuf.cmake:32 (ocv_download)
/Users/Documents/opencv/source/opencv_contrib-master/modules/dnn/CMakeLists.txt:5 (include)


解决方案：将如下路径的三个文件中的关键词FILENAME替换成关键词PACKAGE

/usr/local/opencv310/opencv_contrib-3.1.0/modules/dnn/cmake/OpenCVFindLibProtobuf.cmake
/usr/local/opencv310/opencv_contrib-3.1.0/modules/xfeatures2d/cmake/download_boostdesc.cmake
/usr/local/opencv310/opencv_contrib-3.1.0/modules/xfeatures2d/cmake/download_vgg.cmake

问题3：

如果你下载的opencv_contrib文件为opencv_contrib-master而不是 opencv_contrib-3.1.0，就可能出现如下错误：

Unknown CMake command "ocv_add_testdata".

因为opencv_contrib的版本和opencv版本不匹配，opencv_contrib-master没有"ocv_add_testdata"。

如果使用Opencv时有如下错误：

module object has no attribute 'xfeatures2d'
因为 xfeatures2d属于扩展模块opencv_contrib，需要编译 opencv_contrib-3.1.0

重新cmake

Cmake -D OPENCV_EXTRA_MODULES_PATH=/usr/local/opencv310/opencv_contrib-3.1.0/modules/ /usr/local/opencv310/opencv-3.1.0/

再编译安装

make –j8
make install
/bin/bash -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'
sudo  ldconfig

查看opencv安装情况：

pkg-config --cflags opencv
pkg-config --modversion opencv