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Urgent!!! help with feature detection.

asked 2014-10-23 08:22:12 -0500

chim gravatar image

updated 2018-01-06 07:35:05 -0500

Hi, Everyone, i'm new to this and trying to learn real time feature matching. I try to do it first wit images but i stuck in this tutorial eventually - http://docs.opencv.org/trunk/doc/py_tutorials/py_feature2d/py_matcher/py_matcher.html#matcher I wrote the exactly same thing as the first example and i got this error:

Traceback (most recent call last): File "C:\Users\chimyun\Desktop\FYP\tutorial.py", line 25, in <module> img3 = cv2.drawMatches(img1,kp1,img2,kp2,matches[:10], flags=2) TypeError: Required argument 'outImg' (pos 6) not found

I'm using opencv 3.0.0 Alpha with python 2.7.6 as 2.7.10 doesnt have the method cv2.drawMatches(). Please help me as i need to learn it as soon as possible. Any help would be appreciated.

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unlike, what the docs say, the outImg param is mandatory.

berak gravatar imageberak ( 2014-10-23 11:21:22 -0500 )edit

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answered 2014-10-23 11:04:13 -0500

Hi, You should try with a more stable version (i.e. 2.4.X) as the alpha is not yet stable, and the documentation is not fully updated...

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answered 2014-12-08 16:28:31 -0500

tenspd137 gravatar image

CV3 isn't probably baked yet, but a workaround I found was to create a dummy array to send to the function since it thinks it needs it:

img3 = np.zeros((1,1)) and then

im4 = cv2.drawMatches(im1,kp1,ig2,kp2,matches[:10],img3,flags=2)

then imshow(im4/255.0) to view

Obviously, it probably isn't supposed to work this way, but since CV3 is in development it is probably a bug that needs to be worked out in the python interface still.

Your mileage may vary - but it worked for me pretty well. Once the python/C++ interface gets cleaned up, you shouldn't have to make that img3 to fill in the function.

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Asked: 2014-10-23 08:22:12 -0500

Seen: 4,234 times

Last updated: Dec 08 '14