Re: problem with cvComputeCorrespondEpilines(): bug ???

Hi,

I have exactly the same problem with cvComputeCorrespondEpilines which
returns the error:
"The dimensionality of points must be 2 or 3"

is there a solution ?

thanks,
Simon

--- In OpenCV@xxxxxxxxxxxxxxx, seb_kramm <seb_kramm@xxxx> wrote:
>
> Hello,
> I have a problem with the 'cvComputeCorrespondEpilines()' function,
with OpenCv beta5.
> The thing is, that didn't happen with beta 4, and, after checking
the source, it is 
> obvious that the way the checking is performed has been changed a
bit, and I have a 
> slight feeling that this is where my problem comes from.
> 
> So the minimal "bug" code is: (build in 2 different projects, one
for beta 4, and one 
> for beta 5, linked with the correct headers and libs)
> ------------------------------------------------------
> #include "cv.h"
> int main( int argc, char** argv )
> {
>       CvMat *pt   = cvCreateMat( 2, 1, CV_32F );
>       CvMat *line = cvCreateMat( 3, 1, CV_32F );
>       CvMat *F    = cvCreateMat( 3, 3, CV_32F );
> 
>       cvmSet( pt, 0, 0, 1.2345 );
>       cvmSet( pt, 1, 0, 5.4321 );
> 
>       cvComputeCorrespondEpilines( pt, 1, F , line );
> }
> ------------------------------------------------------
> 
> It works fine with beta 4, and causes the following run-time error
with beta 5:
> "The dimensionality of points must be 2 or 3" (line  868 of
'cvfundam.cpp')
> 
> I tried to guess what the problem was, but I'm stuck on the
signification of the 
> "CV_MAT_CN()" macro. This "dimensionality" thing is computed as:
> 
> dims = CV_MAT_CN(points->type) * points->cols
> or
> dims = CV_MAT_CN(points->type) * points->rows
> 
> depending on if 'cols' bigger than 'rows'
> 
> This checking assumes that you are building epipolar lines for
_several_ points (more 
> than 3...?), and I think it is the cause of failure in my case,
where I only provide 
> ONE point for ONE line.
> 
> Can anybody confirm this issue ?  Any solution in sight ?
> 
> I'm not able to provide a patch, since I don't really see how to
keep the checking 
> without keeping the ability of giving points in lines OR in columns,
as it is 
> mentionned in the doc.
> 
> 
> Thanks for your feedback,
>






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