Installing OpenCV for Java(ubuntu)

Installing OpenCV for Java(ubuntu)
Ubuntu Linux 安裝 OpenCV 步驟

1. Download
   opencv-3.4.1.zip
   opencv_contrib-3.4.1.tar.gz

2. Required Packages
   apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
   apt-get install ant
   安裝 Oracle JDK:
 
   export JAVA_HOME=/usr/lib/jvm/java-8-oracle
   export JRE_HOME=/usr/lib/jvm/java-8-oracle/jre

3. make
   cmake -D CMAKE_BUILD_TYPE=DEBUG -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-3.4.1/modules/ ..
   make -j30
   make install

4. config
   root:
   echo '/usr/local/lib/' >> /etc/ld.so.conf.d/opencv.conf
   執行 ldconfig 將 /etc/ld.so.conf 的資料讀入快取當中
   將動態函式庫載入快取記憶體當中

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

   env:
   PKG_CONFIG_PATH=:/usr/local/lib/pkgconfig/