I have installed OpenCv library through this line "pip install opencv-python" and it is successfully installed, but I am trying to import it through: "import cv2" and it gives me an error:
ModuleNotFoundError: No module named 'cv2'
please help me!
If your pip is installed with any other python version than conda, it won't work.
Option 1) Install pip with conda python
Run conda create -n venv_name and source activate venv_name, where venv_name is the name of your virtual environment.
Run conda install pip. This will install pip to your venv directory.
Option 2) Run conda install opencv
I referred to the question:
python3 openCV install error: Symbol not found: _clock_gettime
that suggest as answer to either upgrade the OS, either install a former version of openCV that does not call for _clock_gettime:
ImportError: dlopen([path]/miniconda3/lib/python3.7/site-packages/cv2/cv2.cpython-37m-darwin.so, 2): Symbol not found: _clock_gettime
Referenced from: [path]/miniconda3/lib/python3.7/site-packages/cv2/.dylibs/libavutil.56.22.100.dylib
Expected in: /usr/lib/libSystem.B.dylib
in [path]/miniconda3/lib/python3.7/site-packages/cv2/.dylibs/libavutil.56.22.100.dylib
I tried to install the downgraded version of opencv from a conda channel :
conda install -n mlvision -c rpi opencv
(see : https://anaconda.org/search?q=opencv)
The error persist when using jupyter, instead from the console it works fine.
I think the problem is in reference to the right environment.
I did the following:
conda create mlvision
conda activate mlvision
# install packages on local env
conda install -n mlvision keras
conda install -n mlvision -c rpi opencv
I see that in the error above the python path does not point to the local conda environment.
I created another question because the referenced answer above did not solve my issue.
__
NB using miniconda, not anaconda.
Mac OS 1.9.5
You can try to install opencv from a different conda channel if you're not tied to rpi.
I would recommend going for conda-forge with conda install -c conda-forge opencv, or maybe default channels that should work with a simple conda install opencv.
Tried the following steps
conda install -c menpo opencv3=3.2.0 ..
Fetching package metadata....An unexpected error has occurred
Did some internet search and used conda config --set ssl_verify=False
Then tried doing conda update -all and conda update pyopenssl but no luck
even remove certifidoes not work ...gives the same error...infact any update / install attempt gives the same result.
I have NOT set my PYTHONHOME or PYTHONPATH
Followin are the screen shots of my current conda settings and the update/install error. Platform : Windows 8.1
If there is any other method to install OpenCV 3.2 in Anaconda environment please mention it
EDIT : PROBLEM SOLVED
Open Anaconda terminal
Navigate to the folder in Anaconda main folder which contains Python Scripts
Download the un-offical opencv + contrib binaries from here
In the Anaconda terminal do pip install
`
For anaconda running python 3.7, you can use
conda install py-opencv=3.4.2
The menpo file page shows only OpenCV 3.2.0 for Python 2.7/3.4/3.5 on linux-64 platform is available.
You can try this OpenCV 3.2.0 binary in github if your Windows is 64-bit and with Python 2.7.
See this https://stackoverflow.com/questions/42310099 for more informtion.
Also, you can go into your Anaconda environment and run one of the following for OpenCV 3.4.4:
conda install -c conda-forge opencv
conda install -c conda-forge/label/gcc7 opencv
conda install -c conda-forge/label/broken opencv
conda install -c conda-forge/label/cf201901 opencv
I was able to create a new environment using the anaconda navigator with python 3.5. It works for me in that environment.
This is the exact error that I am getting. My OS is Ubuntu 16.10.
OpenCV Error: Unspecified error (The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script) in cvShowImage, file /feedstock_root/build_artefacts/work/opencv-3.1.0/modules/highgui/src/window.cpp, line 545
Traceback (most recent call last):
File "untitled.py", line 7, in
cv2.imshow('image',img)
cv2.error: /feedstock_root/build_artefacts/work/opencv-3.1.0/modules/highgui/src/window.cpp:545: error: (-2) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function cvShowImage
my code is:
import numpy as np
import cv2
# Load an color image in grayscale
img = cv2.imread('0002.png',0)
cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()
0002.png is an image in the same directory as the program.
I first installed anaconda with python 3.5, then I installed opencv by using the command
conda install -c conda-forge opencv
I installed libgtk2.0-dev just as the error said to but I still get the same error.
Any help would be much appreciated. I've been trying to solve this for several hours.
1.The easiest way:
conda remove opencv
conda update conda
conda install --channel menpo opencv
or (for OpenCV 3.1) :
conda install -c menpo opencv3
2.And if u don't want to do this, you can try to use matplotlib .
import cv2
import matplotlib.pyplot as plt
img = cv2.imread('img.jpg',0)
plt.imshow(img, cmap='gray')
plt.show()
3.Or try to build library by your own with option WITH_GTK=ON , or smth like that.
Update - 18th Jun 2019
I got this error on my Ubuntu(18.04.1 LTS) system for openCV 3.4.2, as the method call to cv2.imshow was failing. I am using anaconda. Just the below 2 steps helped me resolve:
conda remove opencv
conda install -c conda-forge opencv=4.1.0
If you are using pip, you can try
pip install opencv-contrib-python
I have had to deal with this issue a couple of times, this is what has worked consistently thus far:
conda remove opencv
conda install -c menpo opencv
pip install --upgrade pip
pip install opencv-contrib-python
🚀 Working method (👨🔬 tested on April 19, 2019)
🐞 These error happen because of conda.
🏹 Open Anaconda Prompt and remove conda opencv if installed
👨💻 conda remove opencv
📢 If you have conda env, firstly activate it conda activate <your_env_name>
⏬ After install opencv via pip (click here to offical info)
👨💻 pip install opencv-contrib-python
📢 if pip haven't installed, use conda install pip command.
If you installed OpenCV using the opencv-python pip package at any point in time, be aware of the following note, taken from https://pypi.python.org/pypi/opencv-python
IMPORTANT NOTE
MacOS and Linux wheels have currently some limitations:
video related functionality is not supported (not compiled with FFmpeg)
for example cv2.imshow() will not work (not compiled with GTK+ 2.x or Carbon support)
Also note that to install from another source, first you must remove the opencv-python package
For me (Arch Linux, Anaconda with Python 3.6), installing from the suggested channels menpo or loopbio did not change anything. My solution (see related question) was to
install pkg-config (sudo pacman -Syu pkg-config),
remove opencv from the environment (conda remove opencv) and
re-install opencv from the conda-forge channel (conda install -c conda-forge opencv)
conda list now returns opencv 3.3.0 py36_blas_openblas_203 [blas_openblas] conda-forgeand all windows launched using cv2 are working fine.
I followed this tutorial (OpenCV GTK+2.x error) and did the following. It worked for me :
install the packages : libgtk2.0-dev and pkg-config
cd to your opencv directory
mkdir Release
cd Release
Run the command : cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_GTK=ON -D WITH_OPENGL=ON ..
make
sudo make install
Notice that it is complaining for libgtk2.0-dev and pkg-config. Here is the solution. Uninstall your existing openCV installation.
conda remove opencv3
Install these packages before installing opencv-
conda install gtk2 pkg-config
Now install opencv from menpo
conda install -c https://conda.anaconda.org/menpo opencv3
If you are running inside docker then you may get this error.Solution uninstall current and install the headless one
pip install opencv-python==3.4.5.20
pip install opencv-contrib-python==3.4.5.20
If you are writing to the image and displaying it, you may need the following
apt-get update && apt-get install -y libglib2.0-0 libsm6 libxext6 libxrender1
And if you are wondering how to get the display from Docker, it is possible via X11 in your host
My ubuntu 18.04 machine is running at AWS.
What helped me was (link):
pip uninstall opencv-python
pip install opencv-python==4.1.2.30
Afterwards I got the error: " : cannot connect to X server "
Finally, I managed to make it work by installing MobaXTerm (reference here).
FYI:
I connect to AWS with WinSCP. If you connect to AWS via something like WinSCP, the MobaXTerm interface lets you connect to the "WinSCP temporary session" if you click at "Sessions", which is very convenient. The session screen basically replaces the console but allows to display the image via a pop-up window.
In case you also experience the error ASSERT: “false” in file qasciikey.cpp, line 501 once cv.imshow() or similar is executed, go to the MobaXTerm interface, click Settings -> Configuration -> X11, uncheck "Unix-compatible keyboard" (reference here).
I used pip to install opencv-python. (https://pypi.org/project/opencv-python/)
1) Remove the opencv package from conda:
>> conda remove opencv
2) To your env.yml file add this:
...
dependencies:
- numpy
- pytest
...
- pip:
- opencv-python
Remove opencv from anaconda=
conda remove opencv
Then, reinstall opencv using pip:
pip install opencv
This is working for me.
My Envirment is Win10, and I added the anaconda path to the environment variables's PATH’,the cv2.imshow worked
C:\Users\user\Anaconda3
C:\Users\user\Anaconda3\Scripts
Then restart the windows
Although this is already answered, for me conda-forge solution worked with a hack.
My workstation is a centos 6 machine, and I use conda virtual environment (anaconda 2). Create an environment
conda create --name test python=2.7
and then activate it
conda activate test
Now install opencv from conda-forge
conda install -c conda-forge opencv
Now install matplotlib in this environment (and this is hack 1)
conda install matplotlib
Let's check now imshow works or not. In a terminal, activate test environment and start python. In the interpreter, do
import cv2
import matplotlib.pyplot as plt # hack 2
img = cv2.imread('your_image_file',0)
cv2.imshow('image',img)
This should pop up a window showing image. I did not further research how this solved the case.
Note 1: You may see some error related to xkb, then in your .bashrc file add
export QT_XKB_CONFIG_ROOT=/usr/share/X11/xkb
Note 2: You may see some error related to XDG_RUNTIME_DIR, then in your .bashrc file also add
export XDG_RUNTIME_DIR=.tmp/myruntime
and define myruntime by mkdir -p .tmp/myruntime
For my system (Ubuntu 18.04) the following was working.
First:
sudo apt-get update -y
sudo apt-get install -y libgtk2.0-dev
conda create -n py35 python=3.5
conda activate py35
Then configure the environment
pip install Cython
pip install scikit-build
conda install -c anaconda cmake
pip install dlib
pip install face_recognition
pip install imutils
And finally:
pip install opencv-contrib-python
Easy with Ubuntu 18.04. It works for me:
Remove opencv-python:
pip3 uninstall opencv-python
And then re-install opencv-python:
pip3 install opencv-python
Issue was resolved.
I was able to fix it by installing a previous version of opencv-contrib-python.
I'm using Ubuntu 18
I tried to install OpenCV on Anaconda
pip install cv2
pip install opencv
conda install opencv
conda install -c https://conda.binstar.org/jjhelmus opencv
(refered here Anaconda doesn't find module cv2)
but all failed. Does anybody know how to install this?
Run the following command:
conda install -c https://conda.binstar.org/menpo opencv
I realized that opencv3 is also available now, run the following command:
conda install -c https://conda.binstar.org/menpo opencv3
Edit on Aug 18, 2016:
You may like to add the "menpo" channel permanently by:
conda config --add channels menpo
And then opencv can be installed by:
conda install opencv(or opencv3)
Edit on Aug 14, 2017:
"clinicalgraphics" channel provides relatively newer vtk version for very recent python3
conda install -c clinicalgraphics vtk
I guess
http://answers.opencv.org/question/17536/install-opencv-for-anaconda-ipython/
it would be an answer
If you compile OpenCV from source, and Anaconda is your default python interpretor
(CMake rule PYTHON_PACKAGES_PATH = C:\Anaconda\Lib\site-packages),
then the install rule will copy cv2.pyd to C:\Anaconda\Lib\site-packages.
Otherwise, you could do it manually, and make sure OpenCV libs are in the PATH.
Still I don't know what is CMake rule(?) and "install rule".
Firstly go to your anaconda folder. The path in my case was -
C:\Users.....\Anaconda3 . Then go to the Scripts folder.
Open this link- http://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv .
Download this file - opencv_python-3.2.0-cp36-cp36m-win_amd64.whl from the link and copy paste it into your Scripts folder inside Anaconda3 folder.
Now go to spyder and type this,
import cv2
If everything works out it wont show any error and congrats you just installed it successfully.
Anaconda Python OpenCV-----------------
Remove all previous/current (if any) python installation
Install Anaconda and add anaconda to PATH(Envirnoment variables:: Adavanced system setting->Environment variables->under system variables go to variable PATHand click edit to add new envirnomental variables)
(During installation check box involve PATH)
Open anaconda prompt with admin access. Type and enter:-
conda update --all
conda install -c conda-forge opencv (for opencv)
conda install spyder=4.0.0 (spyder updation)
conda update python (for python updation)