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--- tips:opencv:install [2017/04/24 11:38] – scipio
+++ tips:opencv:install [2018/06/13 09:06] (current) – scipio
@@ Line 1: / Line 1: @@
 ====== opencv install ======
-prereq: ubuntu 16:04 and...
+===== android studio =====
+[[https://stackoverflow.com/questions/50433813/how-to-add-opencv-lib-to-as3-1-2-and-ndk-17-0|integrate opencv in android studio project]]
+===== linux  =====
+prereq: ubuntu 16:04 or 18:04
 <code bash>
 sudo apt-get install -y build-essential cmake
@@ Line 23: / Line 29: @@
 # others
-sudo apt-get install libopenexr-dev
+sudo apt-get install -y libopenexr-dev
@@ Line 34: / Line 40: @@
 </code>
-download sources
+download sources from release or ...
 <code bash>
-wget https://github.com/opencv/opencv/archive/3.2.0.zip
+wget https://github.com/opencv/opencv/archive/3.4.1.zip
-unzip 3.2.0.zip
+unzip 3.4.1.zip
-rm 3.2.0.zip
+rm 3.4.1.zip
-mv opencv-3.2.0 OpenCV
+mv opencv-3.4.1 OpenCV
+cd OpenCV
+</code>
+... from git (better if compiling darknet)
+<code>
+cd /opt
+git clone -b 3.4 --depth 1 https://github.com/opencv/opencv.git opencv.git
+ln -sf opencv.git OpenCV
 cd OpenCV
 </code>
@@ Line 48: / Line 62: @@
 cd build
 # cmake -DWITH_QT=ON -DWITH_OPENGL=ON -DFORCE_VTK=ON -DWITH_TBB=ON -DWITH_GDAL=ON -DWITH_XINE=ON -DBUILD_EXAMPLES=ON ..
-cmake -DWITH_OPENGL=ON -DFORCE_VTK=ON -DWITH_TBB=ON -DWITH_GDAL=ON -DWITH_XINE=ON -DENABLE_PRECOMPILED_HEADERS=OFF -DWITH_JASPER=OFF..
+# cmake -DWITH_OPENGL=ON -DFORCE_VTK=ON -DWITH_TBB=ON -DWITH_GDAL=ON -DWITH_XINE=ON -DENABLE_PRECOMPILED_HEADERS=OFF -DWITH_JASPER=OFF ..
+# with openCL
+# cmake -DWITH_OPENGL=ON -DFORCE_VTK=ON -DWITH_TBB=ON -DWITH_GDAL=ON -DWITH_XINE=ON -DENABLE_PRECOMPILED_HEADERS=OFF -DWITH_JASPER=OFF -DWITH_OPENCL=ON ..
+# with openCL and CUDA
+#cmake -DWITH_OPENGL=ON -DFORCE_VTK=ON -DWITH_TBB=ON -DWITH_GDAL=ON -DWITH_XINE=ON -DENABLE_PRECOMPILED_HEADERS=OFF -DWITH_JASPER=OFF -DWITH_OPENCL=ON -DWITH_CUDA=ON ..
+cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local ..
 time make -j4
@@ Line 60: / Line 79: @@
 sudo ldconfig
 </code>
+===== android =====
+prereq:
+  * android SDK in REAL_ANDROID_SDK (REAL_ANDROID_SDK=/opt/android-sdk) with NDK installed
+Download a stub android sdk and opencv sources
+<code>
+# adjust these paths ##
+REAL_ANDROID_SDK=/opt/android-sdk
+# output builded opencv, can be removed after
+BASE=/opt/OpenCV-android-sdk.custom
+#######################
+mkdir -p ${BASE}
+cd ${BASE}
+wget https://dl.google.com/android/repository/tools_r25.2.5-linux.zip
+unzip tools_r25.2.5-linux.zip
+tool/android sdk
+Select and install the following two packages:
+        Android SDK Build-tools 27.0.3
+        Android 8.1.0 (API 27) -> SDK Platform
+git clone --depth 1 https://github.com/opencv/opencv.git
+cd opencv
+wget https://gist.githubusercontent.com/ngriffiths/296e2fc16b8586705712d50bdfe746b0/raw/350a8cb6497bfe367dda75b7bb202d6c7ce09a72/always-use-ant__find_android.patch && git apply always-use-ant__find_android.patch
+git apply always-use-ant__find_android.patch
+cd platform/android
+# edit ndk-16.config.py
+# ABI("3", "arm64-v8a",   "aarch64-linux-android-4.9", cmake_vars=dict(BUILD_ANDROID_PROJECTS='OFF')),
+ANDROID_SDK=${BASE} ANDROID_HOME=${BASE} ./build_sdk.py \
+	--force_opencv_toolchain \
+	--ndk_path ${REAL_ANDROID_SDK}/ndk-bundle \
+	--config ndk-16.config.py \
+	${BASE}/build
+</code>
+To compile against libc++, I then changed ANDROID_STL="gnustl_static" in build_sdk.py to ANDROID_STL="c++_shared" and ran build_sdk.py again.
+@ngriffiths you need to strip out intel threading libs (TBB). That'll shave off ~15MB off your library.