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Unable to run cameracalibration: module cv2 not found

asked 2011-08-08 08:04:08 -0500

avin111 gravatar image

updated 2014-01-28 17:10:10 -0500

ngrennan gravatar image

I am trying to run the camera calibration for my videre stereo camera's.I built the camera calibration package and it did nt give any errors.But when i am trying the camera calibrator node it is givving erors like "no module cv2 found".I tried to find find but i found only i commented out import cv2 and just used import cv.Also i changed everywhere in the code where there is cv2 to cv.Now when i am trying to run the node i am getting the following errors.

Exception in thread Thread-4:

Traceback (most recent call last):

File "/usr/lib/python2.6/", line 532, in __bootstrap_inner

File "/home/srik/ros/image_pipeline/camera_calibration/nodes/", line 73,

in run


File "/home/srik/ros/image_pipeline/camera_calibration/nodes/", line

146, in handle_stereo


File "/home/srik/ros/image_pipeline/camera_calibration/nodes/", line

292, in redraw_stereo

if len(drawable.params) != 0:

TypeError: object of type 'NoneType' has no len()

I am stuck at this point.I dont know how to proceed from here.Any suggestions would be greatly appreciated.Thanking you

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Are you running against Diamondback or E-Turtle beta or trunk?
Eric Perko gravatar image Eric Perko  ( 2011-08-08 08:06:35 -0500 )edit
I am running ros diamondback on Ubuntu 10.04..
avin111 gravatar image avin111  ( 2011-08-08 08:11:26 -0500 )edit

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answered 2011-08-08 08:37:12 -0500

Eric Perko gravatar image

This looks like you have mismatched versions of code. The Diamondback version of camera_calibration does an import cv, not an import cv2 (source is here). However, trunk (i.e. E-Turtle development) does do an import cv2 (source is here). So if you were running all Diamondback code, there shouldn't have been an import cv2 in the first place. The rest of your errors likely follow from E-Turtle using a newer version of OpenCV than Diamondback.

Make sure that all of your code is checked out from Diamondback tags or branches and not image_pipeline trunk.

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Really thanks for the quick reply...It worked.....Thank you
avin111 gravatar image avin111  ( 2011-08-08 09:16:41 -0500 )edit

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Asked: 2011-08-08 08:04:08 -0500

Seen: 689 times

Last updated: Aug 08 '11