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I have been having the exact same problem as described in this post and someone in the answers suggested that you upgrade to opencv version 2.9. I was wondering how do that? I installed the version I have now by doing

sudo apt-get install python-opencv

Also, how can I check what version I'm running now? I'm on Ubuntu 13.10

EDIT:

After girardengo answer I know I'm on version 2.4.5 Thank you for that!

Avinash Raj
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evan54
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3 Answers3

11

Before installing the development version of OpenCV, I'd suggest to use this code to set the capture size (from the link you posted I assume you're using python):

import cv2

cap = cv2.VideoCapture(device_no)
cap.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, width)
cap.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, height)

To install the development version of opencv (3.0.0-dev today) please follow the steps below:

cd $HOME
mkdir opencv_src
cd opencv_src/
git clone https://github.com/Itseez/opencv.git
cd opencv/
mkdir release
cd release/
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
make
sudo make install
Sylvain Pineau
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  • I've tried the commands you suggest and they don't work for my camera logitech c910. I'm compiling / installing the latest version now and will see if that makes a difference. thank you – evan54 Apr 14 '14 at 16:22
  • Weird, I have a C920 and with opencv 2.4.5 (the default 13.10 version) it works fine. You can check one of mys script [here](http://bazaar.launchpad.net/~checkbox-dev/checkbox/trunk/view/head:/providers/plainbox-provider-checkbox/bin/screenshot_validation) – Sylvain Pineau Apr 14 '14 at 16:27
  • it didn't work with the dev :( I'll mark this solved and post a new question about the error message I get. – evan54 Apr 14 '14 at 16:52
  • hi evan54, just curious - are you using a mac? also, did you install 2.9 or 3.0 based on the above instructions? if you used opencv 3.0 in python did you still refer to it as cv2? – user391339 Feb 10 '15 at 08:54
  • Sometimes you have to link the module `cd ~/.virtualenvs/cv/lib/python2.7/site-packages/ && ln -s /usr/local/lib/python2.7/site-packages/cv2.so cv2.so` – Yauhen Yakimovich Nov 23 '15 at 11:47
7

Open terminal, then launch python interpeter:

python

then, import opencv:

import cv2

finally, print version:

cv2.__version__

if you want to install the latest development version of opencv, you can follow the instructions of the official documentation of opencv from here

girardengo
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1

Script is mentioned below, copy it and run it 

sudo bash install_opencv.sh

Here is script...

# KEEP UBUNTU OR DEBIAN UP TO DATE

 sudo apt-get -y update
 sudo apt-get -y upgrade
 sudo apt-get -y dist-upgrade
 sudo apt-get -y autoremove

 #INSTALL THE DEPENDENCIES


 # Build tools:

 sudo apt-get install -y build-essential cmake


 # GUI:

 sudo apt-get install -y qt5-default libvtk6-dev


 # Media I/O:

 sudo apt-get install -y zlib1g-dev libjpeg-dev libwebp-dev libpng-
 dev libtiff5-dev libjasper-dev libopenexr-dev libgdal-dev


 # Video I/O:

 sudo apt-get install -y libdc1394-22-dev libavcodec-dev libavformat-
 dev libswscale-dev libtheora-dev libvorbis-dev libxvidcore-dev 
 libx264-dev yasm libopencore-amrnb-dev libopencore-amrwb-dev libv4l-
 dev libxine2-dev


 # Parallelism and linear algebra libraries:

 sudo apt-get install -y libtbb-dev libeigen3-dev


 # Python:

 sudo apt-get install -y python-dev python-tk python-numpy python3-
 dev python3-tk python3-numpy


 # Java:

 sudo apt-get install -y ant default-jdk


 # Documentation:

 sudo apt-get install -y doxygen



 # INSTALL THE LIBRARY (YOU CAN CHANGE '3.0.0' FOR THE LAST STABLE 
 VERSION)


 sudo apt-get install -y unzip wget
 wget https://github.com/Itseez/opencv/archive/3.1.0.zip
 unzip 3.1.0.zip
 rm 3.1.0.zip
 mv opencv-3.1.0 OpenCV1
 cd OpenCV1
 mkdir build
 cd build
 cmake -DWITH_QT=ON -DWITH_OPENGL=ON -DFORCE_VTK=ON -DWITH_TBB=ON -
 DWITH_GDAL=ON -DWITH_XINE=ON -DBUILD_EXAMPLES=ON ..
 make -j4
 sudo make install
 sudo ldconfig

 # EXECUTE SOME OPENCV EXAMPLES AND COMPILE A DEMONSTRATION
 # To complete this step, please visit 
 'http://milq.github.io/install-opencv-ubuntu-debian'.
Abhishek Raj
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