Importing openCV in python idle error: shared object file - opencv

Question

I have been trying to use the cv2 library in python (in IDLE on raspberry pi 3) but I can't manage to import it successfully.
when I type import cv2, I get this:
Traceback (most recent call last):
File "/home/pi/Desktop/python/test.py", line 2, in <module>
from .cv2 import *
ImportError: libjasper .so.1: cannot open shared object file: No such file or directory
I have used the terminal to update, upgrade, and install opencv along with pretty much every other thing I could find relating to opencv or lib. I currently can import cv2 in the terminal but not in IDLE. What do I need to do to be able to import the cv2 library? Thanks in advance.

Answer 1

Recommended way of installing opencv on linux as given by opencv docs "https://docs.opencv.org/4.2.0/d2/de6/tutorial_py_setup_in_ubuntu.html" for python3 is:
sudo apt install python3-opencv
for python2:
sudo apt install python-opencv
On Raspberry pi you may occasionally need to run:
sudo apt update --fix-missing
It will auto-install all the dependencies.

Answer 2

As discussed here, below installations seemed to resolve the issue. It worked for me.
pip3 install opencv-python
sudo apt-get install libatlas-base-dev
sudo apt-get install libjasper-dev
sudo apt-get install libqtgui4
sudo apt-get install python3-pyqt5
sudo apt-get install libqt4-test
Or
the newer OpenCV version handles other installations themselves.
pip install opencv-python==4.1.2.30

Answer 3

Follow the commands for opencv and face recognition : (it worked for me)
-> sudo apt update
-> sudo apt upgrade
-> sudo apt-get install python3-pip
pi#raspberrypi:~ $ python3 -V
Python 3.5.3
pi#raspberrypi:~ $ python2 -V
Python 2.7.13
-> pip3 install numpy
-> pip3 install pillow
-> pip3 install dlib
-> sudo apt-get install cmake
-> pip3 install face_recognition
-> sudo apt-get install python-opencv
-> sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev
-> sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev
-> sudo apt-get install libatlas-base-dev
-> sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev -y
-> sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev -y
-> sudo apt-get install libgtk2.0-dev libgtk-3-dev -y
-> sudo pip3 install opencv-python
-> sudo apt-get install libavformat-dev libswscale-dev openexr libopenexr-dev
-> sudo apt-get install libqt4-dev
-> sudo apt-get install libgstreamer0.10-0-dbg libgstreamer0.10-0 libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev
pi#raspberrypi:~ $ python3
Python 3.5.3 (default, Sep 27 2018, 17:25:39)
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> import dlib
>>> import face_recognition
>>>
Depends on the system.
for PI will take : 2 to 3 hr. (total time)
thanks :)