update

opencv/install.md

@@ -77,16 +77,17 @@ sudo apt install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
 sudo apt install libxvidcore-dev libx264-dev
 
 # 安装gtk， 用于opencv gui显示
-sudo apt install libgtk2.0-dev
+sudo apt install libgtk2.0-dev 
 
 
 sudo apt install libatlas-base-dev gfortran
 
 
 # 安装python 环境
-sudo apt-get install python2.7-dev python3-dev
+sudo apt-get install python-dev python3-dev
 sudo apt-get install build-essential libssl-dev libevent-dev libjpeg-dev libxml2-dev libxslt-dev
 
+
 unzip ....
 
 cd opencv
@@ -95,7 +96,6 @@ cd build
 # warning change your path
 cmake -D CMAKE_BUILD_TYPE=RELEASE \
     -D CMAKE_INSTALL_PREFIX=/usr/local \
-    -D OPENCV_EXTRA_MODULES_PATH=/program/opencv_contrib-3.3.0/modules \
     -D ENABLE_NEON=ON \
     -D ENABLE_VFPV3=ON \
     -D BUILD_TESTS=OFF \
@@ -119,5 +119,27 @@ sudo ldconfig
 
 xhost +
 export DISPLAY=:0.0
+```
 
+## cross compile
+> referring https://blog.csdn.net/sun_28/article/details/52760463
+> referring https://docs.opencv.org/master/d0/d76/tutorial_arm_crosscompile_with_cmake.html
+> referring http://shumeipai.nxez.com/2013/10/08/configure-cross-compiler-platform-raspberry-pi.html
+
+
+``` bash
+
+sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev
+
+
+mkdir cross_compile_raspberry
+cd cross_compile_raspberry/
+git clone git://github.com/raspberrypi/tools.git --depth=1
+unzip opencv.zip ./
+
+cd opencv
+mkdir build
+cd build
+sudo apt-get install cmake-qt-gui
+cmake-gui
 ```