Re: homography matrix

--- In OpenCV@xxxxxxxxxxxxxxx, Fadi Chakik <fadichakik@...> wrote:
>
> Hello,
>    
>   Is there any possible way using OpenCV to initialize MANUALLY 
and explicitly the homography matrix. I have only one view (image) 
on which I would like to apply a random projective transformation.
>    
>   I tried to define H like:
>    
>   #define PI 3.1415926535897932384626433832795
> 
>   CvMat* HomographyMatrix = cvCreateMatHeader(3,3,CV_64FC1);
>   IplImage *srcImage, *srcImageWarped;
>   double m[9];
>    
>   float theta=phi=PI; //random values just for testing
>   float lambda1=1, lambda2=0.2; //random values just for testing
>    
>   m[0]= cos(theta);
> m[1]= -sin(theta)*sin(phi);
> m[2]= -sin(theta)*cos(phi);
>   m[3]= 0;
> m[4]= 1/(lambda1*cos(phi));
> m[5]= -1/(lambda1*sin(phi));
>   m[6]= sin(theta);
> m[7]= 1/(lambda2*cos(theta)*sin(phi));
> m[8]= 1/(lambda2*cos(theta)*cos(phi));
>   cvInitMatHeader( HomographyMatrix, 3, 3, CV_64FC1, m );
> 
>   cvWarpPerspective(srcImage, srcImageWarped, HomographyMatrix, 
CV_WARP_FILL_OUTLIERS,  cvScalarAll(0));
>    
>    
>   I got always error on cvWarpPerspective: "bad flag (parameter or 
structure field) (unrecognized or unsupported arraytype) in function 
cvGetMat, cxcore\src\cxarray.cpp (2863)".
>    
>   Help will be appreciated.
>    
>   Is there any way to initialize the matrix without randmoly 
without passing throught phi, theta and lambdai.
>    
>   Thank you.
>   -Fadi
> 
>                       
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> [Non-text portions of this message have been removed]
>
Hi,
I am studying perspective transform. And the same 
error "unrecognized or unsupported arraytype" occured during 
calculation of matrix. I change CV_64FC1 type. Look at carefully 
function definiton. And change number that end of type "CV_64FC'1'" 
1,2,3,4 .
When you compile it OpenCV give error and line number due to error.
In MS Visual studio Edit->GoTo: write line number when page that 
contain opencv function you use. It will show you why error occured.

Sinan 






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