HOWTO: OpenCV 2 & OpenCV 3

district10 commented 8 years ago

Windows

When you find_package( OpenCV REQUIRED ) in CMakeLists.txt, it just look for OpenCVConfig.cmake under OpenCV_DIR, aka include( $ENV{OpenCV_DIR}/OpenCVConfig.cmake ).

If you want to use OpenCV2 & OpenCV3 in your system at the same time. Here is my solution:

VS2010 + OpenCV2 (there is an official prebuild for VS2010)
VS2015 + OpenCV3 (there is an official prebuild for VS2015)

1.

First goto OpenCV official download page, download opencv-2.4.x.exe and opencv-3.1.x.exe.

2.

Second, extract them, set these two proper environment variables:

OpenCV2_DIR -> D:\OpenCV\build
OpenCV3_DIR -> D:\OpenCV3\build
OpenCV_DIR -> %OpenCV_DIR% or %OpenCV3_DIR% (which you prefer)

add to PATH:

%OpenCV2_DIR%\x64\vc10\bin (for VS2010 generated exe)
%OpenCV3_DIR%\x64\vc14\bin (for VS2015 generated exe)

reboot may needed.

3.

Last, generated VS2010, VS2015 project to use OpenCV 2, OpenCV 3 with CMake, respectively.

You can see opencv2 / opencv3 examples in:

district10 commented 7 years ago

VC Version Number & Prebuild

compiler	IDE
`vc14`	Visual Studio 2015 (OpenCV3)
`vc12`	Visual Studio 2013 (OpenCV2, OpenCV3)
`vc11`	Visual Studio 2012 (OpenCV2)
`vc10`	Visual Studio 2010
`vc9`	Visual Studio 2008
`vc8`	Visual Studio 2005
`vc7.1`	Visual Studio .NET 2003
`vc7`	Visual Studio .NET 2002
`vc6`	Visual Studio 6.0

district10 commented 7 years ago

Ubuntu

prerequisites:

sudo apt-get install --assume-yes build-essential cmake git
sudo apt-get install --assume-yes build-essential pkg-config unzip ffmpeg qtbase5-dev python-dev python3-dev python-numpy python3-numpy
sudo apt-get install --assume-yes libopencv-dev libgtk-3-dev libdc1394-22 libdc1394-22-dev libjpeg-dev libpng12-dev libtiff5-dev libjasper-dev
sudo apt-get install --assume-yes libavcodec-dev libavformat-dev libswscale-dev libxine2-dev libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev
sudo apt-get install --assume-yes libv4l-dev libtbb-dev libfaac-dev libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev
sudo apt-get install --assume-yes libvorbis-dev libxvidcore-dev v4l-utils

CV3

cmake, make.

CV2

cmake, make.

Usage

When you want opencv 2,:

export OpenCV2_DIR=/home/tzx/Downloads/archive/opencv-2.4.13/build
cd ~/git/cmake-templates/opencv
mkdir build && cd build
cmake ..
make

When you want opencv 3:

cd ~/git/cmake-templates/opencv3
mkdir build && cd build
export OpenCV2_DIR=/home/tzx/Downloads/archive/opencv-3.1/build
cmake ..
make

I installed OpenCV 3 and added these lines to my .zshrc:

export OpenCV2_DIR=/home/tzx/Downloads/archive/opencv-2.4.13/build2
export OpenCV3_DIR=/usr/local/share/OpenCV

Refs

OpenCV 3.1 Installation Guide on Ubuntu 16.04 · BVLC/caffe Wiki

district10 commented 7 years ago

In my case, better not configure CUDA to the WONT_INSTALL opencv 2. Or you may come across link error.

JingeTu commented 7 years ago

I just set OpenCV_DIR in CMakeLists.txt where my OpenCVConfig.cmake locates.

district10 commented 7 years ago

@JingeTu Like this: include( $ENV{OpenCV_DIR}/OpenCVConfig.cmake )?

district10 / cmake-templates