Python에서 OpenCV 임포트시 에러 - ImportError: numpy.core.multiarray failed to import

Windows10에서 Python 3.7에 OpenCV 4.4.0를 설치후 다음과 같은 에러가 날 경우 해결방법입니다.

** On entry to DGEBAL parameter number  3 had an illegal value

 ** On entry to DGEHRD  parameter number  2 had an illegal value

 ** On entry to DORGHR DORGQR parameter number  2 had an illegal value

 ** On entry to DHSEQR parameter number  4 had an illegal value

ImportError: numpy.core.multiarray failed to import

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "C:\Users\momo\AppData\Local\Programs\Python\Python37\lib\site-packages\cv2\__init__.py", line 5, in <module>

    from .cv2 import *

ImportError: numpy.core.multiarray failed to import

 

다음처럼 pip를 사용하여 opencv 패키지를 설치한 후, 

C:\Users\momo>pip install opencv-contrib-python

Collecting opencv-contrib-python

  Downloading opencv_contrib_python-4.4.0.46-cp37-cp37m-win_amd64.whl (40.1 MB)

     |████████████████████████████████| 40.1 MB 1.7 MB/s

Collecting numpy>=1.14.5

  Downloading numpy-1.19.4-cp37-cp37m-win_amd64.whl (12.9 MB)

     |████████████████████████████████| 12.9 MB 2.2 MB/s

Installing collected packages: numpy, opencv-contrib-python

Successfully installed numpy-1.19.4 opencv-contrib-python-4.4.0.46

WARNING: You are using pip version 20.1.1; however, version 20.2.4 is available.

You should consider upgrading via the 'c:\users\momo\appdata\local\programs\python\python37\python.exe -m pip install --upgrade pip' command.

python에서 OpenCV 모듈 cv2를 임포트하는 순간 에러가 났습니다.

C:\Users\momo>python

Python 3.7.9 (tags/v3.7.9:13c94747c7, Aug 17 2020, 18:58:18) [MSC v.1900 64 bit (AMD64)] on win32

Type "help", "copyright", "credits" or "license" for more information.

>>> import cv2

 ** On entry to DGEBAL parameter number  3 had an illegal value

 ** On entry to DGEHRD  parameter number  2 had an illegal value

 ** On entry to DORGHR DORGQR parameter number  2 had an illegal value

 ** On entry to DHSEQR parameter number  4 had an illegal value

ImportError: numpy.core.multiarray failed to import

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "C:\Users\momo\AppData\Local\Programs\Python\Python37\lib\site-packages\cv2\__init__.py", line 5, in <module>

    from .cv2 import *

ImportError: numpy.core.multiarray failed to import

>>> quit()

해결방법은 간단합니다. OpenCV 4.4.0 설치시 디폴트로 설치되는 numpy 1.19.4 대신에 numpy 1.19.3을 다시 설치해주면 됩니다.

C:\Users\momo>pip install numpy==1.19.3

Collecting numpy==1.19.3

  Downloading numpy-1.19.3-cp37-cp37m-win_amd64.whl (13.2 MB)

     |████████████████████████████████| 13.2 MB 1.7 MB/s

Installing collected packages: numpy

  Attempting uninstall: numpy

    Found existing installation: numpy 1.19.4

    Uninstalling numpy-1.19.4:

      Successfully uninstalled numpy-1.19.4

Successfully installed numpy-1.19.3

WARNING: You are using pip version 20.1.1; however, version 20.2.4 is available.

You should consider upgrading via the 'c:\users\momo\appdata\local\programs\python\python37\python.exe -m pip install --upgrade pip' command.

numpy 버전을 바꾼 후, 테스트해보면 문제없이 cv2 모듈이 임포트 됩니다. 

C:\Users\momo>python

Python 3.7.9 (tags/v3.7.9:13c94747c7, Aug 17 2020, 18:58:18) [MSC v.1900 64 bit (AMD64)] on win32

Type "help", "copyright", "credits" or "license" for more information.

>>> import cv2

>>> cv2.__version__

'4.4.0'

>>>