How do I know which argument throws an exception in Python (with OpenCV)?

Question

Python (with OpenCV) throws the following TypeError. But I have no idea which argument is throwing it. How can I tell?

Traceback (most recent call last):
  File "u.py", line 18, in <module>
    out = unravel2(img,pupil)
  File "/home/chris/code/opencv/iris/support.py", line 57, in unravel2
    cv2.logPolar(img, out, center, cv2.WARP_FILL_OUTLIERS)
TypeError: a float is required

For background, here is my code:

def unravel2(img, pupil):
  out = np.zeros((max_radius-min_radius,720,3), np.uint8)
  center = (297.5,234.5)
  cv2.logPolar(img, out, center, cv2.WARP_FILL_OUTLIERS)

  return out

None of them are floats- and AFAIK none of them are meant to be. — cjm2671
– cjm2671, Commented Apr 15, 2014 at 12:06

berak · Accepted Answer · 2014-04-15 12:15:42Z

2

you got the args for logPolar wrong (probably from the older cv api wrapper)

>>> import cv2
>>> help(cv2.logPolar)
Help on built-in function logPolar in module cv2:

logPolar(...)
    logPolar(src, center, M, flags[, dst]) -> dst

(M is the float in question)

answered Apr 15, 2014 at 12:15

berak

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2 Comments

cjm2671 Over a year ago

Amazing! You are my HERO! :)

berak Over a year ago

;) unfortunately the docs are outdated on this. so better rely on the builtin help, which will at least query the module you're using

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