Cross-compiling OpenCV 3 for Raspberry Pi 2

[nahumb]

Hi,

I have followed the instructions in above tutorial at https://visualgdb.com/tutorials/raspberry/opencv/build/ for opncv-3.4.1.

On step 8 I have noticed that gtk was not found. After watching the log I have found a message  stating that package-config was disabled, and followed the recommendation to add

PKG_CONFIG_LIBDIR=C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot/usr/lib/arm-linux-gnueabihf/pkgconfig;C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot/usr/share/pkgconfig (as for the path) to the environment section configuration.

This solved the problem and gtk3 was found and build went OK.

However, unlike in the tutorial screenshot where 3 successful builds are shown, I got only 1 and 0 failed.

I wanted to continue to step 10 of the process, however I can’t find the OpenCV build directory mentioned in the tutorial and continue with the make install step.

Please advise.

Thank you,

Nahum Budin.

[nahumb]

Update.

Deleted the project and restarted all over, this time the build directory was there (must have been a settings I have missed 🙁 ).

(while setting the CMake command configuration, a VS bug was identified- toggling tabs!?.

A ticket was opened with screenshots and video – see the attached. A workaround is to close the CMake Command tab and reopen it – please add this info to the ticket).

Then, when running the make install command, a Microsoft make tool was executed, though the path was updated as specified.

A workaround – using the full path of make: C:\SysGCC\Raspberry\bin\make install.

Next steps of the tutorial to be followed soon…

Thanks,

Nahum.

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[nahumb]

Final update.

Continued with the tutorial sample program.

When running, got an error message that libjasper cannot be found.

Solution: make sure to install all required libraries on  your Raspberry Pi:

sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
sudo apt-get install libxvidcore-dev libx264-dev
sudo apt-get install libgtk2.0-dev libgtk-3-dev.

Next a new error was reported:

WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files

Solution: sudo apt-get install at-spi2-core.

Finally the demo runs well from the debugger.

Now trying to run the executable directly on the Raspi yield a file not found error.

Reason: no command line parameters are available.

Solution: change default file name in the main section:

/// Load source image
String imageName(“/home/pi/Lena.png”); // by default

Now it runs directly on/from the Raspi. 🙂

My 2 cents.

Thanks,

Nahum.

 

• This reply was modified 6 years, 1 month ago by nahumb.

[support]

Hi,

Thanks for sharing this. We have just finished rechecking everything with the latest OpenCV release and the latest Raspberry Pi toolchain and updated the tutorial.

We have also added a few usability features to VisualGDB (e.g. automatic deployment of installed CMake targets), so please use this build if you would like to try the new features.

[Author]

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