View source for Installing OpenCV3.3 on the Jetson TX2

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|title=Installing OpenCV3.3 on the Jetson TX2
|title_mode=replace
|description={{{description|This wiki document contains helpful instructions and steps to Installing OpenCV3.3 on the Jetson TX2}}}
}}
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== Introduction ==
The main goal of this wiki is to provide a guide for the installation of OpenCV3.3 on the Jetson TX2 board. This guide gives the commands to follow to install opencv and its required packages

== Uninstall OpenCV4Tegra ==
Uninstall OpenCV for Tegra packages, purge local repositories, and update the apt cache using the following commands:

<pre>
sudo apt-get purge libopencv4tegra-dev libopencv4tegra
sudo apt-get purge libopencv4tegra-repo
sudo apt-get update
</pre>

== Required Packages ==
===Base requirements===
<pre>
sudo apt-get install build-essential
sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
</pre>

===GStreamer support (recommended)===
This is required for using the onboard camera
<pre>
sudo apt-get install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
</pre>

===Python Support===
<pre>
sudo apt-get install python2.7-dev
sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev
</pre>

===OpenGL Support===
<pre>
sudo apt-get install libgtkglext1 libgtkglext1-dev
sudo apt-get install qtbase5-dev
</pre>

===video4linux2 support (better handling of usb cameras modes)===
<pre>
sudo apt-get install libv4l-dev v4l-utils qv4l2 v4l2ucp
</pre>

==Installing OpenCV 3.3==

===Downloading Sources===
Version previous to 3.3 don't provide correct support for CUDA in the board
<pre>
wget --no-check-certificate -O OpenCV-3.3.0.zip https://sourceforge.net/projects/opencvlibrary/files/opencv-unix/3.3.0/opencv-3.3.0.zip/download
unzip OpenCV-3.3.0.zip
cd opencv-3.3.0
</pre>

===Compiling===
<pre>
mkdir build
cd build
cmake -D WITH_CUDA=ON -D CUDA_ARCH_BIN="6.2" -D CUDA_ARCH_PTX="" -D WITH_LIBV4L=ON -D CMAKE_BUILD_TYPE=RELEASE -D WITH_LIBV4L=ON -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D WITH_GSTREAMER=ON -D WITH_CUBLAS=1 -D WITH_TBB=ON -D WITH_OPENGL=ON -D CMAKE_INSTALL_PREFIX=/usr/local ..
</pre>

===Installing===
<pre>
make -j6
sudo make install
</pre>

====Applying Patch====
If you find the following mistake while running the make command:

<pre>
/usr/local/cuda-8.0/include/cuda_gl_interop.h:64:2: error: #error Please include the appropriate gl headers before including cuda_gl_interop.h
#error Please include the appropriate gl headers before including cuda_gl_interop.h
</pre>

The following patch must be applied to the /usr/local/cuda-8.0/include/cuda_gl_interop.h file:

<pre>
diff --git a/cuda_gl_interop.h b/cuda_gl_interop.h
index 0f4aa17..e8c538c 100644
--- a/cuda_gl_interop.h
+++ b/cuda_gl_interop.h
@@ -59,13 +59,13 @@
 
 #else /* __APPLE__ */
 
-#if defined(__arm__) || defined(__aarch64__)
-#ifndef GL_VERSION
-#error Please include the appropriate gl headers before including cuda_gl_interop.h
-#endif
-#else
+//#if defined(__arm__) || defined(__aarch64__)
+//#ifndef GL_VERSION
+//#error Please include the appropriate gl headers before including cuda_gl_interop.h
+//#endif
+//#else
 #include <GL/gl.h>
-#endif
+//#endif
 
 #endif /* __APPLE__ */
</pre>

In order to apply the patch copy the code on a file named cuda.patch an locate this file on the directory where the cuda_gl_interop.h file is located and run the following command:

<pre>
patch < cuda.patch
</pre>

The following command might also be necessary: 

<pre>
cd /usr/lib/aarch64-linux-gnu/
sudo ln -sf tegra/libGL.so libGL.so
</pre>

== Articles related ==

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