OpenCV in WorldViz

[JimC]

In your script (or at the Vizard Python prompt) type:

import sys
print sys.path

That will tell you where it's looking for modules.

[JimC]

Never mind. I tried it myself and got the same error. When I copied the dlls into the site-packages/opencv directory it went away.

[sircedric4]

Sweet! Thanks a lot. That did the trick. Now I can play with some of these OpenCV functions.

[sircedric4]

I just got finished trying the capture-cam.py example and got a runtime error. When I ran it, it first prompted me to select a web camera and then when it tried to run it gave the following error:

Microsoft Visual C++ Runtime Library
Runtime Error!

Program: C:\program files\WorldViz\Vizard31\bin\winviz.exe

This application has requested the Runtime to terminate it in an unusual way.  Please contact the application's support team for more information.

I would like to marry the capturing of a video camera with the square detection of squares.py. Does anyone know what runtime error it is running into. It looks like it is getting hung up on:

# get size of the frame
    frame_size = cv.cvGetSize (frame)

[JimC]

It works for me in Vizard (with a Logitech QuickCam). A camera driver issue? What do you get if you print type(frame) just before the crash?

[nige777]

Thanks for the upload - really appreciate it & once I can work out how to use vizards window instead of highGUI's i'll be flying!

Just one odd thing though, when I try to run the kalman example I get this error message:

Traceback (most recent call last):
File "<string>", line11, in ?
File "kalman.py", line 35, in ?
kalman.transition_matrix[:] = A;
File "C:\Program Files\Worldviz\Vizard30\bin\lib\site-packages\opencv\cv.py", line 1944, in __setitem__
return _cv.CvMat__setitem__(*args)
RuntimeError: openCV Error:
Status=Sizes of input arguments do not match
function name=cvConvertScale
error message=
file_name=C:\User\VP\opencv\cxcore\src\cxconvert.c pp
line=1600
Any idea's because I'm fresh out of them?

Thanks

[JimC]

return _cv.CvMat__setitem__(*args)
RuntimeError: openCV Error:
Status=Sizes of input arguments do not match

My guess would be to try looping through the two arrays and setting corresponding elements one at a time rather than trying to set the whole thing at once, e.g.:

for i in range(2):
  for j in range(2):
     transition_matrix[i][j] = A[i][j]

[sircedric4]

Originally Posted by JimC

It works for me in Vizard (with a Logitech QuickCam). A camera driver issue? What do you get if you print type(frame) just before the crash?

I get <type 'NoneType'>.

It would be nice if I could get the openCV camera frame capture stuff to work. I tried incorporating the Vizard (vizcapture) function into squares using the Vizard webcam capabilities and I have not found a means to convert the image from the vizcapture screen buffer into an IPLImage for openCV. I have tried a straight convert and also used adapter.py to try and convert the images, but apparantly there was an error in OpenCV 1.0 when moving from a PIL or other image type to IPLImage.

I have grown tired of going the viz cam route and am back onto trying to get the OpenCV camera handler to work, so any ideas you have I will entertain. I'll try and play with drivers and stuff and let you know how it goes. I have more than one camera plugged in right now, I'll pull those and see if they're causing conflicts.

[nige777]

Thanks you very much that worked perfectly.

Now I, like the original poster, just need to sort a method for converting frame buffer images to IPLImage!!

Came across this -

http://www.depthfirstsearch.net/blog...cv-and-python/

- which seems to address this prob however I am unable to utilize this at the moment due to my severe lack of C or C++ know-how. Any windows/C++ wizards out there who could help?