OpenCV

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Forewords

This page explains how to (cross-)compile OpenCV 2.1.0 for your APF-board.

Pre-requisite

You need to have CMake >=2.6 installed on your system.

Build OpenCV

1. Edit your toolchain.cmake file
2. Create source and build directories

   mkdir -pv opencv-on-armadeus/{src,build}
   

3. Grab the source archive

   cd opencv-on-armadeus/src && wget http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.1/OpenCV-2.1.0.tar.bz2/dowload && tar xvvjf OpenCV-2.1.0.tar.bz2
   

4. Here, you'll have to apply this patch to avoid compilation failed:

   patch -p0 < OpenCV-2.1.0.patch
   

5. Run CMake (generate Makefiles)

   1. cd ~/opencv-on-armadeus/build && cmake -DCMAKE_TOOLCHAIN_FILE:PATH=/path/to/toolchain.cmake ../src/OpenCV-2.1.0
      

   2. It will certainly complain about unfound libraries and some other things, so adjust these things running:

      cmake-gui
      

6. Compile OpenCV libraries

   VERBOSE=1 make
   

Note: cmake-gui Click twice on Configure when you change something. When configuring exit without any error, click on Generate to generate Makefiles. If your configuration is too messy, reset it by deleting the cache (File/Delete Cache) or remove the CMakeCache.txt file in the build directory. Don't hesitate to do so if something (eg. paths) is wrong ;) To see the cmake-command that corresponds to the configuration you have just set in cmake-gui: Tools/Show my changes

Available features

CMake looks for all required tool in the path specified in toolchain.cmake file toolchain.cmake file; therefore, some options, targets, libraries, ... are not available:

• Build:
  • Latex Doc  : Not available in Buildroot
  • New Python support  : Not available (require Python >=2.6, Buildroot provides Python 2.4)
  • Swing Python support : Not available (require Python >=2.6, Buildroot provides Python 2.4)
  • Octave support  : Not available in Buildroot
• Python
  • Executable  : Not found (require Python >=2.6, Buildroot provides Python 2.4)
  • Include dirs.  : Found
  • Library  : Not found (require Python >=2.6, Buildroot provides Python 2.4)
• With
  • V4L  : Disable it (Buildroot provides it, but linker failed)
• OpenCV
  • 3rd party libs.  : You can enable it.

Note: You may need to enable some packages in your Armadeus configuration to get some libraries (libjpeg, libpng and libtiff) found by CMake.

Run OpenCV applications on your APF-board

1. In the build directory, you should find a bin and a lib sub-directories. Copy them (at least the lib directory) on your target.

2. export LD_LIBRARY_PATH=/path/to/the/OpenCVlibdir
   

3. Run your application. You can try cvtest (some tests may fail because of missing resources), it will take a while... a long while ;)

See also

• OpenCV install guide

Appendices

OpenCV-2.1.0.patch

--- OpenCV-2.1.0/3rdparty/flann/constants.h.origin	2010-06-08 01:14:22.171416516 +0200
+++ OpenCV-2.1.0/3rdparty/flann/constants.h	2010-06-08 01:15:06.912417891 +0200
@@ -41,7 +41,7 @@ enum flann_algorithm_t {
 	KMEANS = 2,
 	COMPOSITE = 3,
 	SAVED = 254,
-	AUTOTUNED = 255,
+	AUTOTUNED = 255
 };
 
 enum flann_centers_init_t {
--- OpenCV-2.1.0/3rdparty/flann/flann.h.origin	2010-06-08 01:14:32.588443815 +0200
+++ OpenCV-2.1.0/3rdparty/flann/flann.h	2010-06-08 01:15:06.912417891 +0200
@@ -267,7 +267,7 @@ LIBSPEC int flann_compute_cluster_center
 
 
 #ifdef __cplusplus
-};
+}
 
 
 #include "flann.hpp"
--- OpenCV-2.1.0/3rdparty/include/flann/constants.h.origin	2010-06-08 01:14:54.503416676 +0200
+++ OpenCV-2.1.0/3rdparty/include/flann/constants.h	2010-06-08 01:15:06.912417891 +0200
@@ -41,7 +41,7 @@ enum flann_algorithm_t {
 	KMEANS = 2,
 	COMPOSITE = 3,
 	SAVED = 254,
-	AUTOTUNED = 255,
+	AUTOTUNED = 255
 };
 
 enum flann_centers_init_t {
--- OpenCV-2.1.0/3rdparty/include/flann/flann.h.origin	2010-06-08 01:14:44.672417690 +0200
+++ OpenCV-2.1.0/3rdparty/include/flann/flann.h	2010-06-08 01:15:06.912417891 +0200
@@ -267,7 +267,7 @@ LIBSPEC int flann_compute_cluster_center
 
 
 #ifdef __cplusplus
-};
+}
 
 
 #include "flann.hpp"