No module named cv

Question

I'm trying to run this script:

https://github.com/openalpr/train-detector/blob/master/crop_plates.py

I've never dealt with python before. First of all I had some syntax errors in the print lines. They were lacking parentheses...but I'm not sure if I get this error because of the Python version I installed or this was indeed a syntax error. After fixing the syntax error I'm receiving the following error:

C:\>py crop_plates.py
Traceback (most recent call last):
File "crop_plates.py", line 7, in <module>
import cv2, cv
ImportError: No module named cv

I did the following:

Installed Python 2.7.5 32 bits.

Installed numpy 1.9.1 32 bits (also tried different versions)

Installed matplotlib 1.3.0.

Installed OpenCv

Copied cv2.pyd from

C:\Users\Me\Downloads\opencv\build\python\2.7\x86

to

C:\Python27\Lib\site-packages

But I can't find anywhere the cv.pyd file that I'm missing.

I found references to this guide for installing Opencv but it's not working http://opencv.willowgarage.com/documentation/python/

Thank you very much,

Edit: I'm running Python in Windows 7.

In python 3, print statements expect parenthesis but not so in python 2. Thus, the first error is due to python version. — Dhruv Aggarwal, Aug 14 '17 at 13:39
Allright, I first tried with python 3 now with python 2 I don't get syntax error however the other error still shows — Vallo, Aug 14 '17 at 13:42

score 7 · Answer 1 · answered Aug 14 '17 at 13:42

7

For ImportError: No module named cv, try installing opencv-python module using below command:

pip install opencv-python

answered Aug 14 '17 at 13:42

JSN

2,035
13
27

@Vallo - Have you checked this https://stackoverflow.com/questions/17497033/python-importerror-no-module-named-cv? – JSN Aug 14 '17 at 13:45
Sounds like you've to build OpenCV from source. Please see if this is helpful https://avinton.com/en/academy/install-python2-7-opencv/ – JSN Aug 14 '17 at 13:52
I'll give it a try. I'm running windows but I've found another guide for Windows. Thank you – Vallo Aug 14 '17 at 13:56
I had the error in uploading images in Wagtail 2.8. You save my time a lot! I could handle it by installing this package. Thanks! – Hamed Feb 17 '20 at 09:29

score 3 · Answer 2 · answered Oct 12 '18 at 14:06

3

cv2.cv doesn't exists in OpenCV 3.0. Use simply cv2

Also, the attribute is no more CV_HOUGH_GRADIENT but HOUGH_GRADIENT

So what you looking for is probably:

cv2.HOUGH_GRADIENT

answered Oct 12 '18 at 14:06

Bechilled

71
7

score 1 · Answer 3 · answered Aug 14 '17 at 14:05

1

OK , I searched for a while and find the following :

First: you may write: import cv2.cv as cv to solve your proplem
cv and cv2 are both interface for python , and now , the newest "cv2" is the most used one , but clearly some libraries still use cv and others (like yours) use mix of the two,What is different between all these OpenCV Python interfaces?

answered Aug 14 '17 at 14:05

Yasin Yousif

969
7
23

1

Almost... moment = cv2.Moments(points) AttributeError: 'module' object has no attribute 'Moments' – Vallo Aug 14 '17 at 14:15
1

I'm gonna look if there's an equivalent of Moments for cv2 – Vallo Aug 14 '17 at 14:16
But I guess the original error is solved and this is another issue – Vallo Aug 14 '17 at 14:20
I get this error if i add the .cv extension `File "crop_plates1.py", line 8, in import cv2.cv as cv ImportError: No module named cv` – Vallo Aug 14 '17 at 14:23
ok , this is opencv3 , the mere setting to `cv2` should work , you type the function wrong.... – Yasin Yousif Aug 14 '17 at 14:28
Originally Moments was with capital M and it shows `AttributeError: 'module' object has no attribute 'Moments'` – Vallo Aug 14 '17 at 14:35
try parsing points array to a numpy array before using it. e.g. np.int32(points) – Muhammad Abdullah Aug 15 '17 at 08:57
this is not going to work. because cv means an older distribution of python. this cv2.cv wont help – King Alawaka Apr 05 '18 at 19:09
@Vallo, have you find the solution for Moments? – Bagusflyer Jun 13 '18 at 07:30
1

When I use **moment = cv2.moments(points)**, it shows another error: **TypeError: array is not a numpy array, neither a scalar**. Apparently this two moments are different function. – Bagusflyer Jun 13 '18 at 08:30

score 0 · Answer 4 · answered Aug 13 '18 at 03:44

0

It seems this code is using a old version of OpenCV. Unfortunately there is no mention of the exact version they used in their repo.

As the code is at least 2 years old, I would install opencv version 2.4.

pip install opencv-python==2.4

answered Aug 13 '18 at 03:44

Fred Guth

1,537
1
15
27

No module named cv

4 Answers4

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