Bill Cheatham Bill Cheatham - 4 months ago 86
Python Question

What is the cv2.cv replacement in OpenCV3?

I'm using OpenCV3, and with the python bindings there is no

cv2.cv
module:

In [1]: import cv2

In [2]: from cv2 import cv
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-2-15a6578c139c> in <module>()
----> 1 from cv2 import cv

ImportError: cannot import name cv


However, I have some legacy code of the form:

hsv_im = cv2.cvtColor(image, cv2.cv.CV_BGR2HSV)


When running this, I get the error:

In [7]: hsv_im = cv2.cvtColor(image, cv2.cv.CV_BGR2HSV)
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-7-e784072551f2> in <module>()
----> 1 hsv_im = cv2.cvtColor(image, cv2.cv.CV_BGR2HSV)

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


What is the equivalent of this code in OpenCV3?




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Answer

From OpenCV 2.X OpenCV 3.0 a few things changed.

Specifically:

  • cv2.cv doesn't exists in OpenCV 3.0. Use simply cv2.
  • some defines changed, e.g. CV_BGR2HSV is now COLOR_BGR2HSV.

So you need to change this line:

hsv_im = cv2.cvtColor(image, cv2.cv.CV_BGR2HSV)

to:

hsv_im = cv2.cvtColor(image, cv2.COLOR_BGR2HSV)
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