importing opencv moduls

Question

I have a simple code as mentioned below:

import cv
from opencv.cv import *
from opencv.highgui import *

img = cv.LoadImage("test.jpg")
cap = cv.CreateCameraCapture(0)
while cv.WaitKey(1) != 10:
    img = cv.QueryFrame(cap)
    cv.ShowImage("cam view", img)
cascade = cv.LoadHaarClassifierCascade('haarcascade_frontalface_alt.xml', cv.Size(1,1))

But I faced to this error:

# AttributeError: 'module' object has no attribute 'LoadImage'

when I change the code to below:

import cv
#from opencv.cv import *
#from opencv.highgui import *

img = cv.LoadImage("test.jpg")
cap = cv.CreateCameraCapture(0)
while cv.WaitKey(1) != 10:
    img = cv.QueryFrame(cap)
    cv.ShowImage("cam view", img)
cascade = cv.LoadHaarClassifierCascade('haarcascade_frontalface_alt.xml', cv.Size(1,1))

now the first error got solve and another error raise.

AttributeError: 'module' object has no attribute 'LoadHaarClassifierCascade'

I need both of the modules but it seems that they have conflict to gether.

Now what I have to do?

Can you please specify which classes are contained in which module? — Nicola Coretti
– Nicola Coretti, Commented Jan 31, 2012 at 10:39
You aren't using any of the stuff you've imported in lines 2 and 3. And as far as I understand how python works, it is impossible for commenting out those lines to solve your AttributeError in the first case (It's either in cv module or it's not, and importing more stuff into the global namespace is not going to change that) — wim
– wim, Commented Jan 31, 2012 at 11:05
from the error message you can identify that the last line of code need to this module importing!!! — Amin Jalali
– Amin Jalali, Commented Jan 31, 2012 at 12:38
@Amin please provide a link to the opencv framework you are using, so that we can have a look at the package structure etc. — Nicola Coretti
– Nicola Coretti, Commented Jan 31, 2012 at 12:50

mathematical.coffee · Accepted Answer · 2012-01-31 13:26:22Z

5

In OpenCV to load a haar classifier (in the python interface anyway) you just use cv.Load.

import cv
cascade = cv.Load('haarcascade_frontalface_alt.xml')

See the examples here.

Also, the samples that come with the OpenCV source are really good (in OpenCV-2.xx/samples/python).

answered Jan 31, 2012 at 13:26

mathematical.coffee

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Nicola Coretti · Accepted Answer · 2012-01-31 10:56:40Z

1

How do you access the stuff you've imported?

# imports the cv module, all stuff contained in it and
# the module itself is now accessible via: cv.classname, cv.functionname
# where classname, functionname is the name of the class/function which
# the cv module provides..
import cv

# imports everything contained in the opencv.cv module
# after this import it is available via it's classname, functionname, etc.
# Attention: without prefix!!
from opencv.cv import *

# @see opencv.cv import 
from opencv.highgui import *

@see python modules for more details about modules and imports in python.

If you can provide which classes are contained in which module I could add a specific solution for your problem.

answered Jan 31, 2012 at 10:56

Nicola Coretti

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2 Comments

danr Over a year ago

I think this question is more related to how to import OpenCV libraries properly, than import in Python in general

Amin Jalali Over a year ago

python opencv has some library that are with different syntax.

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