OpenCV camshift.py sample broken after Diamondback upgrade

asked 2011-04-14 01:27:10 -0500

Pi Robot
4046 ●134 ●158 ●192 http://www.pirobot.org/

updated 2011-04-14 07:46:10 -0500

Eric Perko

8406 ●73 ●90 ●144 http://ericperko.com/

Hello OpenCV + ROS users,

I will submit a ticket for this but I'm wondering if anyone has a quick fix in the meantime. I was using the camshift.py OpenCV Python sample successfully under Cturtle. Now, using Diamondback (Debian packages), I get the following error after selecting a rectangle to track:

Traceback (most recent call last):
  File "camshift.py", line 115, in <module>
    demo.run()
  File "camshift.py", line 79, in run
    (iters, (area, value, rect), track_box) = cv.CamShift(backproject, self.track_window, crit)
TypeError: <unknown> is not a numpy array

Does anyone know how I can modify this line to make it work? I am using the latest camshift.py from SVN since the samples don't seem to be included in the ROS vision_opencv stack.

Thanks! patrick

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Hi Eric--thanks for the link. Alas, I get exactly the same error from camshift.py even after downloading and building from source...

Pi Robot ( 2011-04-14 14:47:52 -0500 )edit

I've submitted a ticket for this issue at https://code.ros.org/trac/ros-pkg/ticket/4919. Note that the C++ version of the demo works fine but when comparing the two, I couldn't figure out why the Python version fails. I think it might have something to do with using an Image type instead of Mat for the backproject image/matrix...

Pi Robot ( 2011-04-15 11:04:40 -0500 )edit

This problem seems to have been fixed in OpenCV 2.3 RC which I just now compiled and tried.

Pi Robot ( 2011-06-26 05:33:58 -0500 )edit

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OpenCV camshift.py sample broken after Diamondback upgrade

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OpenCV camshift.py sample broken after Diamondback upgrade