Re: [ros-users] Camera_calibration Error: Stereo calibration

The assertion fails because the size is hardcoded to 640x480 in the
calibrator.py script. Look at line 313. We encountered this issue with
higher res cameras. Change 313-317 to match your camera resolution and
it should be fine.



Mike



From: Adam Stambler [mailto:adasta@gmail.com]
Sent: Sunday, April 25, 2010 7:39 PM
To: ros-users@code.ros.org
Subject: Re: [ros-users] Camera_calibration Error: Stereo calibration



Hi,

I am working with the stereo calibrator. I am trying to calibrate a
stereo rig with two logitech webcams whose images are 320 by 240. The
camera drivers are based off of modified v4l2stereo code. Is it
possible that we introduced this kind of error with an incorrectly
written image publisher?

Thank you again for the help,
Adam

On Sun, Apr 25, 2010 at 6:57 PM, James Bowman <jamesb@willowgarage.com>
wrote:

Hi Adam,

Is this the monocular or stereo calibrator?
And what size image /camera is this working with?

On Sun, Apr 25, 2010 at 2:50 PM, Adam Stambler <adasta@gmail.com> wrote:

    Hello Folks,

    

    I am using boxturtle to do stereo calibration.  I have been
running the cameracalibrator.py node with no trouble up until the point
where it needs to calibrate.  When I hit the green calibrate button, and
it outputs this error message:

    

    epipolar error: 0.740361764685
    OpenCV Error: Assertion failed (src.type() == dst.type() &&
dst.size() == mapx.size()) in cvRemap, file
/home/asher/ros/stacks/vision_opencv/opencv2/build/opencv-svn/src/cv/cvi
mgwarp.cpp, line 3083
    Exception in thread Thread-9:
    Traceback (most recent call last):
      File "/usr/lib/python2.6/threading.py", line 525, in
__bootstrap_inner
        self.run()
      File "./cameracalibrator.py", line 59, in run
        self.function(m)
      File "./cameracalibrator.py", line 233, in handle_stereo
        lscrib = self.c.lremap(lrgb)
      File
"/home/asher/ros/stacks/image_pipeline/camera_calibration/src/camera_cal
ibration/calibrator.py", line 407, in lremap
        cv.Remap(src, r, self.lmapx, self.lmapy)
    error: src.type() == dst.type() && dst.size() == mapx.size()

    

    I am a bit flummoxed by the error as the arguments to lremap all
seem to be OK.  Is there some way I could be making a mistake in setting
up the calibrator?

    

    Have other people had this problem with the current revision of
boxturtle?  

    

    Thank you for the help and guidance,
    Adam Stambler

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--
J.


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