Re: Tracking Warning/Error Message on Toolbox_Calib

[c.]

On 12 Feb 2013, at 22:10, niverik2k <address@hidden> wrote:

> I recently got Octave to use the Toolbox_Calib Package for MatLab, located
> at; http://www.vision.caltech.edu/bouguetj/calib_doc/
> 
> I followed the instructions to use this package on Octave at;
> http://www.sparetimelabs.com/cameracalib/index.html
> Example Steps;
> http://www.vision.caltech.edu/bouguetj/calib_doc/htmls/example.html
> 
> Everything was working as expected to follow the instructions above until I
> got to "extract the grid" step (from example page) corners, and got a flurry
> of warnings and error messages. Although I could easily trace the Error
> Messages, I could not figure out where the warning messages where coming
> from in order to try and resolve this issue. I believe the warning messages
> where causing the error messages, but I don't know how to trace the root of
> the problem.
> 
> Here is the steps I take and the error message I received;
> 
> octave:6>* click_calib*
> 
> Extraction of the grid corners on the images
> Number(s) of image(s) to process ([] = all images) = 
> Window size for corner finder (wintx and winty):
> wintx ([] = 5) = 
> winty ([] = 5) = 
> Window size = 11x11
> Do you want to use the automatic square counting mechanism (0=[]=default)
>  or do you always want to enter the number of squares manually (1,other)? 
> 
> Processing image 1...
> Using (wintx,winty)=(5,5) - Window size = 11x11      (Note: To reset the
> window size, run script clearwin)
> Click on the four extreme corners of the rectangular complete pattern (the
> first clicked corner is the origin)...
> warning: division by zero
> warning: division by zero
> Size of each square along the X direction: dX=30mm
> Size of each square along the Y direction: dY=30mm   (Note: To reset the
> size of the squares, clear the variables dX and dY)
> warning: division by zero
> warning: division by zero
> warning: division by zero
> warning: division by zero
> error: svd: cannot take SVD of matrix containing Inf or NaN values
> error: called from:
> error:   /home/parallels/toolbox_calib/compute_homography.m at line 87,
> column 10
> error:   /home/parallels/toolbox_calib/click_ima_calib.m at line 194, column
> 25
> error:   /home/parallels/toolbox_calib/click_calib.m at line 157, column 9
> 
> Any help you can give is greatly appreciated. Thank you.
You could try the setting the option

debug_on_warning (1)

to have Octave stop and open a debug prompt when a warning is issued, then type

dbstack

to show the location in your code where the warning was generated.

HTH,
c.