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ubuntuにOpenCV2のnon free版を入れる

RTAB-MapでSURFが必要っぽいので、OpenCV2のnon free版を入れる。

dpkg -l | grep opencv

StackOverFlowの記事

最良の回答のとおりにやったら出来た。

http://stackoverflow.com/questions/27481849/include-nonfree-opencv-2-4-10-on-ubuntu

sudo add-apt-repository --yes ppa:xqms/opencv-nonfree
sudo apt-get update 
sudo apt-get install libopencv-nonfree-dev

RTAB-Map

cmakeをしたら、nonfree moduleが入っていると出た。
http://kubotti.hatenablog.com/entry/2016/05/12/153414

-- With OpenCV 2 nonfree module (SIFT/SURF) = YES (License: Non commercial)

-- Info :
--   Version : 0.11.5
--   CMAKE_INSTALL_PREFIX = /usr/local
--   CMAKE_BUILD_TYPE =     Release
--   CMAKE_INSTALL_LIBDIR = lib/x86_64-linux-gnu
--   BUILD_APP =            ON
--   BUILD_TOOLS =          ON
--   BUILD_EXAMPLES =       ON
--   BUILD_SHARED_LIBS =    ON
--   CMAKE_CXX_FLAGS =  -fmessage-length=0  -Wno-deprecated -fopenmp
--   With OpenCV 2 nonfree module (SIFT/SURF) = YES (License: Non commercial)
--   With Freenect             = NO (libfreenect not found)
--   With OpenNI2              = NO (OpenNI2 not found)
--   With Freenect2            = YES (License: Apache v2 and/or GPLv2)
--   With dc1394               = YES (License: LGPL)
--   With FlyCapture2/Triclops = NO (Point Grey SDK not found)
--   With TORO                 = YES (License: Creative Commons [Attribution-NonCommercial-ShareAlike])
--   With g2o                  = NO (g2o not found)
--   With GTSAM                = NO (GTSAM not found)
--   With VERTIGO              = YES (License: GPLv3)
--   With cvsba                = NO (cvsba not found)
--   With Qt4                  = YES (License: Open Source or Commercial)
-- --------------------------------------------
-- Configuring done
-- Generating done