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How to Install OpenCV 3.4.0 with Python 3 on Raspberry Pi 3

Introduction

OpenCV (Open Source Computer Vision) is a library of programming functions mainly aimed at real-time computer vision. It is released under a BSD license and hence it’s free for both academic and commercial use. It has C++, Python and Java interfaces and supports Windows, Linux, Mac OS, iOS and Android. OpenCV was designed for computational efficiency and with a strong focus on real-time applications.

In this post, I will show you how to install OpenCV 3.4.0 with Python 3.5 on Raspberry Pi 3. First I will show you how to install OpenCV3 without any virtual environment and how you can also use a virtual environment to work with that build file as well.

Raspberry Pi 3 B+ Boards (Amazon):

►CanaKit Raspberry Pi 3 B+ (B Plus) Starter Kit

►Raspberry Pi 3 Model B+ (Motherboard Only)

►CanaKit Raspberry Pi 3 B+ (B Plus) with 2.5A Power Supply (UL Listed)

Objectives:

Instruction to install OpenCV on Raspberry Pi.

  • OpenCV version: 3.4.0
  • Target platform: Raspberry Pi 3 B
  • OS: Raspbian Stretch
  • Language: Python 3

Video Youtube:

Steps:

There are some steps to install OpenCV properly on Raspberry Pi 3 with Python 3. I will show all the steps to get it working properly.

Step 1: Expand filesystem

Type the following command to expand the Raspberry Pi3 file system

sudo raspi-config

Then select the following

  • Advanced Options > A1 Expand filesystem > Press “Enter”

It will show a message “The root partition has been resized”.

Then you need to reboot your pi using the following command.

sudo shutdown -r now

Step 2: Free Up Some Space

The default OS will take around 15% if you are using 32GB card. But if you are using a 8GB memory card it might take 50% of all your space. So, it is better to remove some unused packages like LibreOffice and Wolfram engine to free up some space on your pi.

You can do it simply typing the following command on the terminal window.

sudo apt-get purge wolfram-engine
sudo apt-get purge libreoffice*
sudo apt-get clean
sudo apt-get autoremove

Step 3: Install Dependencies

  • The first step is to update and upgrade any existing packages:

sudo apt-get update 
sudo apt-get upgrade

  • If you have been shown any error to fix you can type the following

sudo apt-get upgrade --fix-missing

  • Then reboot your pi.

sudo shutdown -r now

After your pi boots up start the Terminal again. Do the following.

  • Install CMAKE developer packages

sudo apt-get install build-essential cmake pkg-config -y

  • Install Image I/O packages

sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev -y

  • Install Video I/O packages

sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev -y
sudo apt-get install libxvidcore-dev libx264-dev -y

  • Install the GTK development library for basic GUI windows

sudo apt-get install libgtk2.0-dev libgtk-3-dev -y

  • Install optimization packages (improved matrix operations for OpenCV)

sudo apt-get install libatlas-base-dev gfortran -y

Step 4: Install Python 3, setuptools, dev and Numpy

  • Install Python 3 and numpy

sudo apt-get install python3 python3-setuptools python3-dev -y
wget https://bootstrap.pypa.io/get-pip.py
sudo python3 get-pip.py
sudo pip3 install numpy

Step 5: Download the OpenCV 3.4 and contrib extra modules

cd ~
wget -O opencv.zip https://github.com/Itseez/opencv/archive/3.4.0.zip
unzip opencv.zip
wget -O opencv_contrib.zip https://github.com/Itseez/opencv_contrib/archive/3.4.0.zip
unzip opencv_contrib.zip

Step 6: Compile and Install OpenCV 3.4.0 for Python 3

cd opencv-3.4.0
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D BUILD_opencv_java=OFF \
-D BUILD_opencv_python2=OFF \
-D BUILD_opencv_python3=ON \
-D PYTHON_DEFAULT_EXECUTABLE=$(which python3) \
-D INSTALL_C_EXAMPLES=OFF \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D BUILD_EXAMPLES=ON\
-D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.4.0/modules \
-D WITH_CUDA=OFF \
-D BUILD_TESTS=OFF \
-D BUILD_PERF_TESTS= OFF ..

Step 7: Swap Space size before compiling to add more virtual memory

It will enable OpenCV to compile with all four cores of the Raspberry PI without any memory issues.

Open your /etc/dphys-swapfile and then edit the CONF_SWAPSIZE  variable

sudo nano /etc/dphys-swapfile

It will open the nano editor for editing the CONF_SWAPSIZE. Change it like below:
# set size to absolute value, leaving empty (default) then uses computed value
# you most likely don't want this, unless you have an special disk situation
# CONF_SWAPSIZE=100
CONF_SWAPSIZE=1024

Then save the changes you’ve made, press Ctrl + O. To exit nano, type Ctrl + X. If you ask nano to exit from a modified file, it will ask you if you want to save it. Just press N in case you don’t, or Y in case you do. It will then ask you for a filename. Just type it in and press Enter.

Then type the following lines to take it into effect

sudo /etc/init.d/dphys-swapfile stop
sudo /etc/init.d/dphys-swapfile start

Step 7: Finally Ready to be Compile

Type the following command to compile it using 4 cores of pi

make -j4

Step Optional: Compile with a single core of Pi

If you face any error while compiling due to memory issue you can start the compilation again with only one core using the following command

make clean
make

Step 8: Install the build on raspberry pi

After the successful build install the build using the following command

sudo make install
sudo ldconfig

Step 9: Verify the OpenCV build

After running make install, OpenCV + Python bindings should be installed in usr/local/lib/python3.5/dist-packages or usr/local/lib/python3.5/site-packages.

You need to use the site-packages or dist-packages. Look where it has been created and use that site-packages or dist-packages. In my case it is in dist-packages.

Again, you can verify this with the ls command:

ls -l /usr/local/lib/python3.5/dist-packages/

Look for a name like cv2.so and if it is not there then look for a name like cv2.cpython-35m-arm-linux-gnueabihf.so (name starting with cv2. and ending with .so). It might happen due to some bugs in Python binding library for Python 3.

We need to rename cv2.cpython-35m-arm-linux-gnueabihf.so to cv2.so using the following command:

cd /usr/local/lib/python3.5/dist-packages/
sudo mv /usr/local/lib/python3.5/dist-packages/cv2.cpython-35m-arm-linux-gnueabihf.so cv2.so

Step 10: Testing OpenCV 3.4.0 install

pi@raspberrypi:~ $ python3
Python 3.5.3 (default, Jan 19 2017, 14:11:04) 
[GCC 6.3.0 20170124] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.__version__
'3.4.0'

Step Optional: Remove the zip files to free up some space:

cd ~
rm opencv.zip opencv_contrib.zip

Step 11: Don’t forget to change your swap size back!

Open your /etc/dphys-swapfile  and then edit the CONF_SWAPSIZE  variable

sudo nano /etc/dphys-swapfile

It will open the nano editor for editing the CONF_SWAPSIZE. Change it like below:
# set size to absolute value, leaving empty (default) then uses computed value
# you most likely don't want this, unless you have an special disk situation
CONF_SWAPSIZE=100
# CONF_SWAPSIZE=1024

Then save the changes you’ve made, press Ctrl + O. To exit nano, type Ctrl + X. If you ask nano to exit from a modified file, it will ask you if you want to save it. Just press N in case you don’t, or Y in case you do. It will then ask you for a filename. Just type it in and press Enter.

Then type the following lines to take it into effect

sudo /etc/init.d/dphys-swapfile stop
sudo /etc/init.d/dphys-swapfile start

Step 12 (Additional): Setting OpenCV for a virtual environment (Python 3)

Next section is for adding access from a virtual environment.

  • Make sure that you have installed venv for Python 3.

sudo apt-get install python3-venv -y

  • Make a virtual environment for OpenCV3 with Python3

python3 -m venv ~/cvpi

  • To activate the venv you made, execute

source ~/cvpi/bin/activate

Let’s make a symbolic link inside of your venv package folder.
ln -s /usr/local/lib/python3.5/dist-packages/cv2.so ~/cvpi/lib/python3.5/site-packages/cv2.so

Here, ‘~/cvpi’ is the virtual environment directory

The result will look like this.

(cvpi) pi@raspberrypi:~ $ cd ~/cvpi/lib/python3.5/site-packages
(cvpi) pi@raspberrypi:~/cvpi/lib/python3.5/site-packages $ ls -al
total 48
drwxr-xr-x 11 pi pi 4096 Mar 3 18:32 .
drwxr-xr-x 3 pi pi 4096 Mar 3 18:27 ..
lrwxrwxrwx 1 pi pi 45 Mar 3 18:32 cv2.so -> /usr/local/lib/python3.5/dist-packages/cv2.so
-rw-r--r-- 1 pi pi 126 Mar 3 18:27 easy_install.py
drwxr-xr-x 17 pi pi 4096 Mar 3 18:31 numpy
drwxr-xr-x 2 pi pi 4096 Mar 3 18:31 numpy-1.14.1.dist-info
drwxr-xr-x 11 pi pi 4096 Mar 3 18:27 pip
drwxr-xr-x 2 pi pi 4096 Mar 3 18:27 pip-9.0.1.dist-info
drwxr-xr-x 5 pi pi 4096 Mar 3 18:30 pkg_resources
drwxr-xr-x 2 pi pi 4096 Mar 3 18:30 pkg_resources-0.0.0.dist-info
drwxr-xr-x 2 pi pi 4096 Mar 3 18:27 __pycache__
drwxr-xr-x 5 pi pi 4096 Mar 3 18:27 setuptools
drwxr-xr-x 2 pi pi 4096 Mar 3 18:27 setuptools-33.1.1.dist-info

Don’t forget to install numpy for a new venv
pip3 install numpy

Step 13: Testing OpenCV 3.4.0 in the virtual environment

Now, check that you can use cv2 INSIDE of the virtual environment.

(cvpi) pi@raspberrypi:~ $ python3
Python 3.5.3 (default, Jan 19 2017, 14:11:04) 
[GCC 6.3.0 20170124] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.__version__
'3.4.0'

Activate and Deactivate your Virtual Environment

Activate

source ~/cvpi/bin/active

Deactivate
deactivate

 

 

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61 thoughts on “How to Install OpenCV 3.4.0 with Python 3 on Raspberry Pi 3”

  1. omar

    hello, having a problem about Step 7: Finally Ready to be Compile just output
    “make: *** No target specified and no makefile found. stop”

    How can i solve this problem

    Reply
    1. Life2Coding Post author

      Check the video tutorial (Link Above attached). I think your directory is different. Try to go to the exact directory.

      Reply
  3. jim

    This is failing when installing on a fresh install of stretch-lite :sudo pip3 install numpy The message is “sudo: pip3: command not found” I’m not sure what the work around is.

    Reply
  4. Rafael

    Hello Excellent work. I have a question, it is possible to have OpenCV installed simultaneously for the two Python 2.7 & 3.5, greetings.

    Reply
    1. Reema Majumdar

      Its the same problem with me, my raspi already has 2.7 version in the OS level installed. When trying to compile the CV2 for 3.5 it is showing a lot of issues.

      In file included from /usr/include/c++/6/bits/stl_algo.h:59:0,
      from /usr/include/c++/6/algorithm:62,
      from /root/opencv/modules/core/include/opencv2/core/base.hpp:53,
      from /root/opencv/modules/core/include/opencv2/core.hpp:54,
      from /root/opencv/modules/core/include/opencv2/core/utility.hpp:52,
      from /root/opencv/build/modules/core/precomp.hpp:49:
      /usr/include/c++/6/cstdlib:75:25: fatal error: stdlib.h: No such file or directory
      #include_next

      Reply
  6. Alexander

    Is there a way to copy the compiled files onto an other Raspberry(same model)? I want to avoid recompilation on a different pi

    Reply
  8. rubentxo

    I want to thank for your step by step tutorial! It’s the best one!
    Great work!!! I’ll follow your blog!

    Thanks!

    Reply
  10. Francesco Garavaglia

    Hi!
    I’m having problems with Step 10: Testing OpenCV 3.4.0 install
    This is what I get:

    pi@raspberrypi:~ $ python3
    Python 3.5.3 (default, Jan 19 2017, 14:11:04)
    [GCC 6.3.0 20170124] on linux
    Type “help”, “copyright”, “credits” or “license” for more information.
    >>> import cv2
    Traceback (most recent call last):
    File “”, line 1, in
    File “/home/pi/.local/lib/python3.5/site-packages/cv2/__init__.py”, line 4, in
    from .cv2 import *
    ImportError: libQtGui.so.4: cannot open shared object file: No such file or directory

    Please Help me!

    Reply
    1. Life2Coding Post author

      Watch the youtube video tutorial properly. I think you missed any of the steps that why it is not getting the OpenCV Library

      Reply
      1. Francesco Garavaglia

        I retried, but nothing changes. I saw that the unique difference occurs during “Step 6: Compile and Install OpenCV 3.4.0 for Python 3” when I got this:

        — Python 3:
        — Interpreter: /usr/bin/python3 (ver 3.5.3)
        — Libraries: /usr/lib/arm-linux-gnueabihf/libpython3.5m.so (ver 3.5.3)
        — numpy: /home/pi/.local/lib/python3.5/site-packages/numpy/core/include (ver 1.14.2)
        — packages path: lib/python3.5/dist-packages

        Looking at numpy I got site-packages instead of dist-packages. I think that’s the problem!
        What do you think? Sorry, but I’m a newbie 🙂

        Reply
          1. Nithin Bharadwaj

            HI Franscesco,

            Could you please elaborate on how you solved the above issue? I am getting the same error, and am not able to resolve it. Please help!

          3. Aethan

            Hi Francesco,

            Same as Nithin. We have the same issue and wonder what you did to fix it. Can you or Life2Coding explain us what to do ?

            Thank you.

  11. Matt Miller

    Thanks for making a Python3 set of instructions
    I used make instead of make -j4 as I’ve had problems in the past compiling previous versions of openCV and it worked 1st time.

    Reply
  12. Steven Blue

    at the end of step 6 i get (configuring incomplete, errors occured!)
    what can i do about that???

    Reply
    1. Life2Coding Post author

      Have you give the “..” at the end as well. Try to use the same text from the step 6 to configure it

      Reply
      1. Steven Blue

        yes i type the “..” and the process starts properly but at the end i take thar errors…..when i go backwards to see the process i saw some “not found” files like “linux/videodev.h”, “linux/videodev2.h”,”libgphoto2″, and some other files also

        Reply
  13. hung

    Hi I Install Image I/O packages

    sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev -y

    An error occurred…….

    Reading package lists… Done
    Building dependency tree
    Reading state information… Done
    Package libpng12-dev is not available, but is referred to by another package.
    This may mean that the package is missing, has been obsoleted, or
    is only available from another source

    E: Unable to locate package libjasper-dev
    E: Package ‘libpng12-dev’ has no installation candidate

    How to solve??

    Reply
  14. hilda

    at step 1 i got (Your partition layout is not currently supported by this tool. You are probably using NOOBS, in which case your root filesystem is already expanded anyway)
    because i installed using NOOBS , should i install raspbian stretch ? please help me, thankyou

    Reply
  15. Nithin Bharadwaj

    Hi,
    I am receiving the same error. I did a clean installation of OpenCV 3.4 on Raspberry Pi 3. After the installation, I went into the Python3 virtualenv and checked for OpenCV installation by doing, “import CV2” and then a “cv2.__version__”. It worked when I was inside the OpenCV build folder. Now, I came out of it and am in the home directory, and I get a syntax error for “Import cv2”. Please help.

    Reply
  18. sleman

    i followed your steps in this tutorial to use opencv in face recognition but when i use the command
    recognizer = cv2.createLBPHFaceRecognizer()
    or
    recognizer = cv2.face.LBPHFaceRecognizer_create()
    it gives me errors

    Reply
  19. Vaisakh

    [ 65%] Linking CXX executable ../../bin/opencv_traincascade
    ../../lib/libopencv_imgcodecs.so.3.4.0: undefined reference to `WebPFlipBuffer’
    ../../lib/libopencv_core.so.3.4.0: undefined reference to `carotene_o4t::absDiff(carotene_o4t::Size2D const&, unsigned char const*, int, unsigned char const*, int, unsigned char*, int)’
    ../../lib/libopencv_imgcodecs.so.3.4.0: undefined reference to `WebPDeallocateAlphaMemory’
    ../../lib/libopencv_core.so.3.4.0: undefined reference to `carotene_o4t::absDiff(carotene_o4t::Size2D const&, unsigned short const*, int, unsigned short const*, int, unsigned short*, int)’
    ../../lib/libopencv_core.so.3.4.0: undefined reference to `carotene_o4t::absDiff(carotene_o4t::Size2D const&, signed char const*, int, signed char const*, int, signed char*, int)’
    ../../lib/libopencv_imgcodecs.so.3.4.0: undefined reference to `WebPAvoidSlowMemory’
    ../../lib/libopencv_core.so.3.4.0: undefined reference to `carotene_o4t::absDiff(carotene_o4t::Size2D const&, float const*, int, float const*, int, float*, int)’
    ../../lib/libopencv_imgcodecs.so.3.4.0: undefined reference to `WebPCopyDecBuffer’
    ../../lib/libopencv_imgcodecs.so.3.4.0: undefined reference to `WebPAllocateDecBuffer’
    ../../lib/libopencv_imgcodecs.so.3.4.0: undefined reference to `WebPCopyDecBufferPixels’
    ../../lib/libopencv_core.so.3.4.0: undefined reference to `carotene_o4t::absDiff(carotene_o4t::Size2D const&, short const*, int, short const*, int, short*, int)’
    ../../lib/libopencv_core.so.3.4.0: undefined reference to `carotene_o4t::absDiff(carotene_o4t::Size2D const&, int const*, int, int const*, int, int*, int)’
    ../../lib/libopencv_imgcodecs.so.3.4.0: undefined reference to `VP8DecompressAlphaRows’
    collect2: error: ld returned 1 exit status
    apps/traincascade/CMakeFiles/opencv_traincascade.dir/build.make:389: recipe for target ‘bin/opencv_traincascade’ failed

    i got this error when i was installing opencv on my rpi b+ model running with rasbian stretch. please help me

    Reply
    1. Nova1211

      I have the same exact error, if you have solved it just text me, I have spent lots of hours for build process but I kept getting this error all the time and no answers on stack overflow or stackexchange either!

      Reply
  20. Iker

    Hello!

    I have a problem in the step 9.

    The compilation of OpenCV was well done, but in the verification step, over the directoy “/usr/local/lib/python3./usr/local/lib/python3.5/dist-packages” if i execute the “ls” command, the next appears:

    pip pip-10.0.1.dist-info

    So, when i trying to change the name of cv2.cpython-35m-arm-linux-gnueabihf.so by cv2.so, it says “mv: cannot stat ‘/usr/local/lib/python3.5/dist-packages/cv2.cpython-35m-arm-linux-gnueabihf.so’: No such file or directory”

    Any solutions?

    Thanks.

    Regards.

    Reply
  22. Nitin Shrivastava

    CMake Error: The source directory “/home/pi” does not appear to contain CMakeLists.txt.

    it shows this error….please help

    Reply
  23. wannaBrobot

    Great tutorial, best I’ve seen! Here is a tip for anyone getting the

    E: Unable to locate package ______
    E: Package ‘_______’ has no installation candidate

    error and how I fixed it.

    SPECS:
    Raspberry Pi 3B, OS: Raspbian, Version: 9 (Stretch)

    1) sudo nano /etc/apt/sources.list
    a) Uncomment “deb-src http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi”
    b) Press ctrl-o, then enter, then ctrl-x

    2) sudo nano /etc/apt/sources.list.d/raspi.list
    a) Uncomment “deb-src http://archive.raspberrypi.org/debian/ stretch main ui”
    b) Press ctrl-o, then enter, then ctrl-x

    3) sudo apt-get update
    4) sudo apt-get upgrade
    5) sudo apt-get upgrade –fix-missing

    6) Do steps 3-5 two to three times.
    a) The problem is that with the above two lines commented out apt-get was not caching the proper packages. By updating and upgrading apt-get you are allowing it to refresh and store the poroper packages.

    7) Reboot

    Reply
  24. Abdulbasit

    If you just uploded the SD card image for us it would be the greatest work done for OpenCV&RPi users

    Reply
  25. Mang

    problem in the step 9.

    The compilation of OpenCV was well done, but in the verification step, over the directoy “/usr/local/lib/python3./usr/local/lib/python3.5/dist-packages” if i execute the “ls” command, the next appears:

    pip pip-10.0.1.dist-info

    So, when i trying to change the name of cv2.cpython-35m-arm-linux-gnueabihf.so by cv2.so, it says “mv: cannot stat ‘/usr/local/lib/python3.5/dist-packages/cv2.cpython-35m-arm-linux-gnueabihf.so’: No such file or directory”

    Got the same, once it was a compilation error so no cv2…so file was created. Next time it was placed in /site-packages/
    Next I forgot which environment I was in, was in the hidden /cv catalog.

    Reply
  26. Jose Esquivel

    Hi there,

    I am having an issure with step 9. I keep getting the ” no such file or directory ”. Can you help me figure our what is wrong. Thank you.

    pi@raspberrypi:~/opencv-3.4.0/build $ ls -l /usr/local/lib/python3.5/dist-packages/
    ls: cannot access /usr/local/lib/python3.5/dist-packages/: No such file or directory
    pi@raspberrypi:~/opencv-3.4.0/build $ ls -l /usr/local/lib/python3.5/site-packages/
    ls: cannot access /usr/local/lib/python3.5/site-packages/: No such file or directory

    Reply
  27. Kay Zazz

    error: (-215) scn == 3 || scn == 4 in function cvtColor
    This error occurs when I use opencv on raspberry pi.
    How can I fix this nontype error?
    Reply me

    Reply
  28. putri

    i got a problem, i follow the step i stuck on compiling with the command make -j4 , and i got this. can you help me???

    [ 38%] Linking CXX shared library ../../lib/libopencv_ml.so
    CMakeFiles/opencv_ml.dir/src/lr.cpp.o: file not recognized: File truncated
    collect2: error: ld returned 1 exit status
    modules/ml/CMakeFiles/opencv_ml.dir/build.make:460: recipe for target ‘lib/libopencv_ml.so.3.4.0’ failed
    make[2]: *** [lib/libopencv_ml.so.3.4.0] Error 1
    CMakeFiles/Makefile2:1889: recipe for target ‘modules/ml/CMakeFiles/opencv_ml.dir/all’ failed
    make[1]: *** [modules/ml/CMakeFiles/opencv_ml.dir/all] Error 2
    make[1]: *** Waiting for unfinished jobs….
    [ 43%] Built target opencv_imgproc
    Makefile:160: recipe for target ‘all’ failed
    make: *** [all] Error 2

    Reply
  29. Lafleur

    Hello 🙂
    Just to precise I’m working on a orange pi on Rasbian.
    I have a probleme at step 6.
    Here is the error message :
    CMake Error at CMakeLists.txt:29 (cmake_minimum_required):
    CMake 2.8.12.2 or higher is required. You are running version 2.8.9

    I’ve tried several times to update and upgrade. I didn’t forget the sudo apt-get upgrade –fixe-missing.

    I’ve tried also apt-get install cmake and it’s return:
    ” Building dependency tree
    Reading state information… Done
    cmake is already the newest version.
    0 upgraded, 0 newly installed, 0 to remove and 12 not upgraded. ”

    Any ideas ? :/
    Thank for the great job you did. Great tuto which has perfectly worked on my raspberry 😉

    Reply
  30. ambhub

    hi.. pls i am having raspbian stretch installed… i followed through all the tutorial but i got stucked at the building of opencv….
    fatal error: can’t write PCH file: No space left on device
    }
    ^
    compilation terminated.
    modules/bgsegm/CMakeFiles/pch_Generate_opencv_test_bgsegm.dir/build.make:62: recipe for target ‘modules/bgsegm/test_precomp.hpp.gch/opencv_test_bgsegm_RELEASE.gch’ failed
    make[2]: *** [modules/bgsegm/test_precomp.hpp.gch/opencv_test_bgsegm_RELEASE.gch] Error 1
    CMakeFiles/Makefile2:6336: recipe for target ‘modules/bgsegm/CMakeFiles/pch_Generate_opencv_test_bgsegm.dir/all’ failed
    make[1]: *** [modules/bgsegm/CMakeFiles/pch_Generate_opencv_test_bgsegm.dir/all] Error 2
    Makefile:160: recipe for target ‘all’ failed
    make: *** [all] Error 2 space error even though i used both make -j4 and make. i have an 8gig memory card. thanks

    Reply
  31. Jeon Nora

    Hello, I am just a beginner to Raspberry Pi and I wanted to install opencv to my raspberry pi 3 and I have got the error on Step 3:Install Dependencies!

    At that step, Install CMAKE developer packages, when I write this command,

    sudo apt-get install build-essential cmake pkg-config -y

    I got this error!

    Package cmake is not available, but is referred to by another package.
    This may mean that the package is missing, has been obsoleted, or
    is only available from another source

    E: Package ‘cmake’ has no installation candidate

    I am currently using “Raspbian GNU/Linux 9 (stretch)”.

    Reply
  32. Henry

    Great tutorial! I commend this for beginner like me. Easy to follow..

    for activate and deactivate virtual environment.

    use “activate instead of active /// source ~/cvpi/bin/activate

    Reply
  34. Alabi Abdullateef

    Great Tutor, I follow your video and article guide for complete install and it awasome..success 100%. Great ..thanks alot. I need more tutorial on image recongnition please , kindly assist asap

    Reply
  35. Javier Gaitán

    Hi ¡ i just want to thank you for the tutorial it was very useful. Keep going with that kind attitude to help others who like this stuff

    Reply
  36. Azad

    I have problem in Step: 7
    Show below message:
    CMakeFiles/opencv_imgcodecs.dir/src/grfmt_exr.cpp.o: file not recognized: File truncated
    collect2: error: ld returned 1 exit status
    modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/build.make:578: recipe for target ‘lib/libopencv_imgcodecs.so.3.4.0’ failed
    make[2]: *** [lib/libopencv_imgcodecs.so.3.4.0] Error 1
    CMakeFiles/Makefile2:2505: recipe for target ‘modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/all’ failed
    make[1]: *** [modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/all] Error 2
    make[1]: *** Waiting for unfinished jobs….
    [ 56%] Built target opencv_dnn
    Makefile:160: recipe for target ‘all’ failed
    make: *** [all] Error 2

    Please give me a solution. I try make -j4 and only make also but show same message when come in this state(56%).

    Reply
  37. Suchitra

    Hi, I got these error. Could you please help?

    [ 67%] Building CXX object modules/xfeatures2d/CMakeFiles/opencv_xfeatures2d.dir/src/vgg.cpp.o
    /tmp/ccXSlohP.s: Assembler messages:
    /tmp/ccXSlohP.s: Fatal error: can’t write 3996 bytes to section .rodata._ZZN2cv11xfeatures2d8VGG_ImplC4EifbbfbE2PJ_2 of CMakeFiles/opencv_xfeatures2d.dir/src/vgg.cpp.o because: ‘No space left on device’
    /tmp/ccXSlohP.s: Fatal error: can’t close CMakeFiles/opencv_xfeatures2d.dir/src/vgg.cpp.o: No space left on device
    modules/xfeatures2d/CMakeFiles/opencv_xfeatures2d.dir/build.make:595: recipe for target ‘modules/xfeatures2d/CMakeFiles/opencv_xfeatures2d.dir/src/vgg.cpp.o’ failed
    make[2]: *** [modules/xfeatures2d/CMakeFiles/opencv_xfeatures2d.dir/src/vgg.cpp.o] Error 1
    CMakeFiles/Makefile2:13645: recipe for target ‘modules/xfeatures2d/CMakeFiles/opencv_xfeatures2d.dir/all’ failed
    make[1]: *** [modules/xfeatures2d/CMakeFiles/opencv_xfeatures2d.dir/all] Error 2
    Makefile:160: recipe for target ‘all’ failed
    make: *** [all] Error 2
    pi@raspberrypi:~/opencv-3.

    Reply
  40. Deepak Bist

    problem on

    [ 70%] Building CXX object samples/cpp/CMakeFiles/example_image_alignment.dir/image_alignment.cpp.o
    make[2]: *** [modules/python3/CMakeFiles/opencv_python3.dir/build.make:63: modules/python3/CMakeFiles/opencv_python3.dir/__/src2/cv2.cpp.o] Error 1
    make[1]: *** [CMakeFiles/Makefile2:3740: modules/python3/CMakeFiles/opencv_python3.dir/all] Error 2
    make[1]: *** Waiting for unfinished jobs….
    [ 70%] Linking CXX executable ../../bin/cpp-tutorial-MatchTemplate_Demo
    [ 70%] Linking CXX executable ../../bin/cpp-example-stereo_match
    [ 70%] Built target tutorial_MatchTemplate_Demo
    [ 70%] Built target example_stereo_match
    [ 70%] Linking CXX executable ../../bin/cpp-example-image_alignment
    [ 70%] Built target example_image_alignment
    make: *** [Makefile:163: all] Error 2

    Reply

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