Running OpenCV from a Python virtualenv
Solution 1
Fired up a virtualenv and followed this guide: http://www.samontab.com/web/2011/06/installing-opencv-2-2-in-ubuntu-11-04/ , up until manipulating and copying the cv shared objects. Instead, I copied cv.so (from my OpenCV-2.2.0/lib directory) to my virtualenv site-packages (eg. env/lib/python2.7/site-packages/). Once cv.so was in my environment, I was able to import cv within python.
Solution 2
Here is the cleanest way, using pyenv and the virtualenv plug-in.
Install Python with shared library support (so we get a libpython2.7.dylib on Mac OS X or libpython2.7.so on Linux).
env PYTHON_CONFIGURE_OPTS="--enable-shared" pyenv install -v 2.7.6
Create the virtualenv, based on the version of python we just installed.
pyenv virtualenv 2.7.6 myvirtualenv
Activate the virtualenv.
pyenv shell myvirtualenv
pyenv rehash
Install numpy. Otherwise opencv will fail to link itself to Python correctly.
pip install numpy
Set the prefix of the python install.
PREFIX_MAIN=`pyenv virtualenv-prefix`
Set the prefix of the environment. (sic! The name of these pyenv commands are a bit deceptive!)
PREFIX=`pyenv prefix`
Now configure and install opencv. Notice that the opencv binaries and packages will be installed in our virtualenv while the dynamic library and includes of the Python install is used.
cd openCV2.4
mkdir release
cd release
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX="$PREFIX" -DPYTHON_EXECUTABLE="$PREFIX"/bin/python2.7 -DPYTHON_LIBRARY="$PREFIX_MAIN"/lib/libpython2.7.so -DPYTHON_INCLUDE_DIR="$PREFIX_MAIN"/include/python2.7 -DPYTHON_PACKAGES_PATH="$PREFIX"/lib/python2.7/site-packages/ ..
make install
(On OSX, replace libpython2.7.so with libpython2.7.dylib.)
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runfalk
Updated on September 15, 2022Comments
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runfalk over 1 year
I'm trying to install OpenCV within a virtualenv on my Ubuntu Server 12.04. I found a thread discussing this but managed to extract no information from it.
I tried using
pip install pyopencv
but it failed.... package/extras/core/ndarray.cpp:598:1: instantiated from here package/extras/core/ndarray.cpp:546:9: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘Py_intptr_t {aka long int}’ [-Wformat] package/extras/core/ndarray.cpp: In function ‘boost::python::api::object sdcpp::from_ndarray_impl(const sdcpp::ndarray&) [with T = cv::Scalar_<double>]’: package/extras/core/ndarray.cpp:601:1: instantiated from here package/extras/core/ndarray.cpp:546:9: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘Py_intptr_t {aka long int}’ [-Wformat] package/extras/core/ndarray.cpp: In function ‘boost::python::api::object sdcpp::from_ndarray_impl(const sdcpp::ndarray&) [with T = cv::Range]’: package/extras/core/ndarray.cpp:604:1: instantiated from here package/extras/core/ndarray.cpp:546:9: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘Py_intptr_t {aka long int}’ [-Wformat] error: command 'gcc' failed with exit status 1
This error only occurs the second time I run
pip install
. If I delete the remaingingbuild/
folder I get this error.-- Configuring incomplete, errors occurred! Configuring PyOpenCV via CMake... Error: error occurred while running CMake to configure PyOpenCV. You may want to manually configure PyOpenCV by running cmake's tools: mkdir build cd build cmake-gui .. OR cmake .. cd .. ---------------------------------------- Command python setup.py egg_info failed with error code 255
I have at least the following apt packages installed.
build-essential uuid-dev python-dev python-pip libpq-dev cmake libboost-dev libcv-dev libcvaux-dev libboost-python-dev libboost1.48-dev
How can I install OpenCV within my virtualenv?
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Nate Parsons over 11 yearsThanks, copying the shared objects was what I was missing! Only difference was I copied cv.py[c] and cv2.so from /usr/lib/pymodules, analagous to github.com/ingenuitas/SimpleCV#installation
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Cătălin George Feștilă about 11 yearsI have all this opencv.i386 : Collection of algorithms for computer vision opencv-devel.i386 : Development files for using the OpenCV library opencv-python.i386 : Python bindings for apps which use OpenCV I use Fedora , the error is:"/include/c++/4.3.2/bits/stl_move.h:87: error: within this context" I using virtualenv.py .
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Burhan Khalid about 11 years@CatalinFestila you should open another discussion as your question is different than what this is talking about.