what's cv2 and how to install it (i had run 'pip install cv2 --user') ?

[andyyuan78]

envy@ub1404:~/os_pri/github/video_to_sequence$ python download_videos.py
Traceback (most recent call last):
File "download_videos.py", line 6, in
import cv2
ImportError: No module named cv2

envy@ub1404:~/os_pri/github/video_to_sequence$ pip show cv2

Name: cv2
Version: 1.0
Location: /home/envy/.local/lib/python2.7/site-packages
Requires:
envy@ub1404:/os_pri/github/video_to_sequence$ python download_videos.py
Traceback (most recent call last):
File "download_videos.py", line 6, in
import cv2
ImportError: No module named cv2
envy@ub1404:/os_pri/github/video_to_sequence$

[jazzsaxmafia]

It is OpenCV
you can install it by
pip install opencv

but I recommend installing it from source, as the python binary may not have video processing module in it.
http://opencv.org/

[andyyuan78]

after run
suod apt-get install python-opencv
it passed, but new trouble come:

envy@ub1404:/os_pri/github/video_to_sequence$ python download_videos.py
Traceback (most recent call last):
File "download_videos.py", line 3, in
import pandas as pd
File "/home/envy/.local/lib/python2.7/site-packages/pandas/init.py", line 7, in
from pandas import hashtable, tslib, lib
File "pandas/src/numpy.pxd", line 157, in init pandas.hashtable (pandas/hashtable.c:38262)
ValueError: numpy.dtype has the wrong size, try recompiling
envy@ub1404:/os_pri/github/video_to_sequence$

would you like show me the result of 'pip list'?

[andyyuan78]

fix by reinstall pandas

[mshayeb]

this works for me:

pip install opencv-python

[700brains]

failed on window

C:>pip install opencv-python
Collecting opencv
Could not find a version that satisfies the
)
No matching distribution found for opencv

[andythewhale]

@mshayeb why does that work?

[mshayeb]

check the the version of your python, if you are using python 3 sometimes you have to call pip3

pip3 install opencv-python

make sure you are using python3 and not python 2 in run

[n4nagappan]

On ubuntu

sudo apt-get install python-opencv
pip install opencv-python

[prabinzz]

pip3 install opencv-python

installs opencv3 what if i want v2 ???

[ghost]

"pip3.6 install opencv" gives back error message:
No matching distribution found for opencv

[MCSH]

@prabinzz
you have to give pip a version, like this:
pip install opencv-python=={version}

[prashantmore123]

Install opencv-python instead of cv2.
pip install opencv-python

[root-sudip]

for python3.5, You can do by using this command => sudo pip3 install opencv-python

[harshit0511]

"pip install opencv-python"
works fine on mac os (y)

[Tianhuanyu]

ensure you have installed numpy and scipy
then "pip install opencv-python"
or"pip install opencv-python==version"
for u can use source of ustc "pip install opencv-python -i http://pypi.mirrors.ustc.edu.cn/simple"

[SaiKiranMukka]

this works for me
"pip3 install opencv-python"

[jatinmittal199510]

what @n4nagappan has given, worked for me. Thanks a lot. :)

[biplobb]

In web2py ,opencv version is 2.But in my local machine opencv version 3.2.ORB_create() is supported in my local machine.But in web2py ORB_create() is not supported . Can you give me any solution?Thanks in advance.

[Estapraq]

I have window10 and Python3.6. I did
pip install panda
pip install opencv-python

worked!

[gsum]

for ubuntu 16.04
pip3 install opencv-python //does not work
pip install opencv-python //works for me

[Matrixsun]

if you use ananconda , you can install opencv by conda:
conda install opencv

[black0017]

If you have multiple versions of python on linux :

python2 -m pip install opencv-python # python2.x
python3.5 -m pip install opencv-python #python3.5
python3.6 -m pip install opencv-python #python3.6

add --user in the end if you have permission issues.

[eliethesaiyan]

you might also install pip install opencv_contrib-python as some module are missing in opencv

[zaheerkhancs]

pip3 install opencv-python

it worked for me.

[adriendomoison]

If you've been like me starting to install everything after June 27th 2018, make sure you are not using Python 3.7. Otherwise you'll get the error since this version is not supported yet by OpenCV

Collecting opencv-python
  Could not find a version that satisfies the requirement opencv-python (from versions: )
No matching distribution found for opencv-python

[aamirmalik]

@adriendomoison thanks a lot for this information! I was able to make opencv-python work with python2.7 - just sticking with that for now.

BTW is there a Python3 version you know which supports opencv-python?

[adriendomoison]

@aamirmalik OpenCV 3 works with Python 2.7, 3.4, 3.5 and 3.6. 👍

[kamarajuPrathi]

@adriendomoison does it work for python 3.7 ?

[adriendomoison]

@kamarajuPrathi no, not at the moment sadly

[ramneek029]

If you've been like me starting to install everything after June 27th 2018, make sure you are not using Python 3.7. Otherwise you'll get the error since this version is not supported yet by OpenCV

Collecting opencv-python
  Could not find a version that satisfies the requirement opencv-python (from versions: )
No matching distribution found for opencv-python

is there some solution for that ??

[aaaisha]

i want install cv2 not cv3 please can anyone tell me the correct command?

[itsthejoker]

@aaaisha pip install opencv-python, assuming you're in a virtualenv.

[Mega-Touk]

running this under raspberry pi wont work because of opencv-python not beeing compiled for ARM on official repo, you first need to follow https://www.piwheels.org then it will be okay to pip install opencv-python

[belmarca]

Same error for me using pip 19.0.1.

$ python --version                                  
Python 3.6.6
$ pip install opencv-python-headless                
Collecting opencv-python-headless
  Could not find a version that satisfies the requirement opencv-python-headless (from versions: )
No matching distribution found for opencv-python-headless

[sahil-motwani]

"pip install opencv-python"
works fine on mac os (y)

cvtColor function is present in opencv-python?
if not than what should I use to get my work done

[despirit]

"pip3.6 install opencv" gives back error message:
No matching distribution found for opencv

I use windows 10
on command prompt
python -m pip install opencv-python

[TomYule]

pip3 install opencv-python pip install opencv-python
Collecting opencv-python
Could not find a version that satisfies the requirement opencv-python (from versions: )
No matching distribution found for opencv-python

I use mac os 10.14.5
python 3.8

I found a lot of information to solve the problem

brew tap brewsci/bio
brew tap brewsci/science
brew install opencv

Source
https://www.codingforentrepreneurs.com/blog/install-opencv-3-for-python-on-mac/

[rahul-moorkoth]

This worked for me.

pip install opencv-contrib-python

[krunal704]

Not able to install OpenCV 4.1 using pip3 install opencv-python or sudo apt-get install python3-opencv

[deveshwaripujari]

Install opencv-python instead of cv2.
pip install opencv-python

WHY ???

[vesko-vujovic]

I had a problem with opencv, even if i installed everything inside my conda env I couldn't import cv2 module. I was getting the error "module not found".
What i did i removed pandas with pip unistall and conda remove after that i installed pandas and open cv with sudo pip3 intstall **.

Hope it helps.

[mkuangdotcom]

pip3 install opencv-python pip install opencv-python Collecting opencv-python Could not find a version that satisfies the requirement opencv-python (from versions: ) No matching distribution found for opencv-python

I use mac os 10.14.5 python 3.8

I found a lot of information to solve the problem

brew tap brewsci/bio
brew tap brewsci/science
brew install opencv

Source https://www.codingforentrepreneurs.com/blog/install-opencv-3-for-python-on-mac/

MacOS 13.1
Python 3.11.4

Works for me too

[mkuangdotcom]

i want install cv2 not cv3 please can anyone tell me the correct command?

Try this guide:

https://gist.github.com/innat/4af8e9a3accfdcf2511ee4ced26a1d77