Compute projection matrix function (Feature #549)

Added by Georgios Petrou over 14 years ago. Updated over 14 years ago.

Status:Done Start date:
Priority:High Due date:
Assignee:- % Done:

0%
Category:imgproc, video
Target version:-
Difficulty: Pull request:

Description

I have made a small function that computes the projection matrix based on the type P = [R|T] to use with the cvTriangulatePoints function.

CvMat *cvGetProjectionMatrix(CvMat *intrinsicMatrix,
CvMat *rotationMatrix,
CvMat *translationVector) {
CvMat *cameraMatrix = cvCreateMat(3,4,CV_32FC1);
CvMat *rotationTranslationMatrix = cvCreateMat(3,4,CV_32FC1); 

for(int i=0; i<3; i++)
{
      for(int j=0; j<3; j++)                
         cvmSet( rotationTranslationMatrix, i, j, cvmGet( rotationMatrix, i, j ) );                
   }
for(int i=0; i<3; i++)            
      cvmSet( rotationTranslationMatrix, i, 3, cvmGet( translationVector, i, 0 ) );
                cvMatMul(intrinsicMatrix,rotationTranslationMatrix,projectionMatrix);
[[CvMat]] *projectionMatrix64 = cvCreateMat(3,4,CV_64FC1);         cvConvert(projectionMatrix,projectionMatrix64);
    cvReleaseMat(&rotationTranslationMatrix);            
cvReleaseMat(&projectionMatrix);

return projectionMatrix64;
}

Associated revisions

Revision 2304d536
Added by Andrey Kamaev about 12 years ago

Merge pull request #549 from asmorkalov:android_mips_static_build_fix

History

#1
Updated by Vadim Pisarevsky over 14 years ago

with the newly added hconcat() (horizontal concatenation) and vconcat() (vertical concatenation) the function becomes trivial (in the new C++ API):

Mat P;
hconcat(R, T, P);
P = cameraMatrix * P;

so, there is no need, perhaps, in a separate function

  • Status changed from Open to Done
  • (deleted custom field) set to wontfix

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