Surf missing in opencv 2.4 for python

Question

I'm trying to instantiate a SURF object in python using OpenCV as described here but this happens:

>>> import cv2
>>> cv2.__version__
'2.4.0'
>>> cv2.SURF()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'SURF'

Does anyone know why this happens or if SURF is missing from the Python version of OpenCV?

Bezique

That works just fine up to 2.3.2, and the docs say it should work too. What does dir(cv2) show you? – Hillaryhillbilly

Answer 1

It is a regression which should be fixed in the next library update.

But SURF is not really absent. You still can access it via the generic wrappers:

surf_detector = cv2.FeatureDetector_create("SURF")
surf_descriptor = cv2.DescriptorExtractor_create("SURF")

---

Update: cv2.SURF() is restored in OpenCV 2.4.1

Casar

Thanks, that works. What do you mean when you say it's a regression? – Bezique

Can someone tell we what is the difference between the two versions (cv2.FeatureDetector_create("SURF") + cv2.DescriptorExtractor_create("SURF") vs. cv2.SURF()) expect that the second version is more compact? – Arrowworm

Is it really fixed in 2.4.1? I'm trying to use 2.4.2 and am seeing the same error. – Chiffchaff

@AndreyKamaev: I get a segfault when calling getParams() on the resulting object; how do I e.g. set upright to True? – Pascia