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I ended up updating my version of OpenCV to 3.1.0 because I heard there had been an update on the Python bindings to cv::reduce since 2.4.13.

I also changed the function call to include 'dtype=' which I think is needed for all the optional arguments

dst = cv2.reduce(img, 0, cv2.REDUCE_SUM, dtype=cv2.CV_32S)

NB - img = the edges of an image i imported, dst did not need to be initialised

I no longer get an error! :)

I ended up updating my version of OpenCV to 3.1.0 because I heard there had been an update on the Python bindings to cv::reduce since 2.4.13.

I also changed the function call to include 'dtype=' which I think is needed for all the optional arguments

dst = cv2.reduce(img, 0, cv2.REDUCE_SUM, dtype=cv2.CV_32S)

NB - Notes

• img = the edges of an image i imported, imported

• dst did not need to be initialisedinitialised

• cv2.cv.CV_REDUCE_SUM changed to cv2.REDUCE_SUM somewhere between versions (I didn't see any
  documentation on this, I just got an error saying it was no longer there
  and I guessed the new name.

  I no longer get an error! :)

I ended up updating my version of OpenCV to 3.1.0 because I heard there had been an update on the Python bindings to cv::reduce since 2.4.13.

I also changed the function call to include 'dtype=' which I think is needed for all the optional arguments

dst = cv2.reduce(img, 0, cv2.REDUCE_SUM, dtype=cv2.CV_32S)

I no longer get an error! :)

Notes

• img = the edges of an image i that I imported

• dst did not need to be initialised

• cv2.cv.CV_REDUCE_SUM changed to cv2.REDUCE_SUM somewhere between versions (I didn't see any
  documentation on this, I just got an error saying it was no longer there
  and I guessed the new name.

  I no longer get an error! :)