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POFinding camera and distortion matrix usinc cvCalibrateCamera2( )
 

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  1. POFinding camera and distortion matrix usinc cvCalibrateCamera2( )
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    <p>I was trying to find out the camera matrix and distortion coefficients using <code>cvCalibrateCamera2</code>. There were no compilation errors, but when I am trying to execute the program it gives:</p> <blockquote> <p>OpenCV error: Sizes of input arguments do not match( both matrices must have the same number of points) in cvConvertPointsHomogenous, file /build/buildd/opencv-2.3.1/modules/calib3d/src/fundam.cpp</p> </blockquote> <p>size of the matrix storing object points in 4 x 3 and that of the matrix storing image points in 4 X2, what could be wrong?</p> <p>Now I made certain changes to my code. This is the code that I am using:</p> <pre><code>#include "opencv2/highgui/highgui.hpp" #include "opencv2/core/core.hpp" #include "opencv2/imgproc/imgproc_c.h" #include "opencv2/calib3d/calib3d.hpp" #include &lt;iostream&gt; #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;math.h&gt; //function to call cvCalibrateCamera2() void calibrate(CvMat* object_points, CvMat* image_points, CvMat* intrinsic,CvMat* distortion) { const int point_count= object_points-&gt;rows; const int image_count=object_points-&gt;rows/point_count; CvMat* const full_object_points = cvCreateMat(image_count*point_count,3,CV_32FC1); CvMat* const point_counts= cvCreateMat(image_count,1,CV_32SC1); for(int i =0; i&lt;image_count;i++) { CV_MAT_ELEM(*point_counts,float , i,0)= point_count; for(int j=0;j&lt;point_count;j++) { for(int k=0; k&lt;3;k++){ CV_MAT_ELEM(*full_object_points,float,i*point_count+j,k)=CV_MAT_ELEM(*object_points,float,j,k); } } } cvCalibrateCamera2(full_object_points,image_points,point_counts,cvSize(1,1),intrinsic, distortion,NULL,NULL,0); } int main() { const float points[][2]={{1,2},{0,0},{3,5},{5,2}}; const int image_count=5; const int point_count=sizeof(points)/sizeof(points[1]); CvMat* const object_points=cvCreateMat(point_count,3,CV_32FC1); for(int i=0; i&lt;point_count;i++) { CV_MAT_ELEM(*object_points, float, i,0)=points[i][0]; CV_MAT_ELEM(*object_points, float, i,1)=points[i][1]; CV_MAT_ELEM(*object_points, float, i,2)=0; } CvMat* const image_points=cvCreateMat(image_count*point_count,2,CV_32FC1); CvMat* const intrinsic=cvCreateMat(3,3,CV_32FC1); CvMat* const distortion=cvCreateMat(5,1,CV_32FC1); calibrate(object_points,image_points,intrinsic,distortion); } </code></pre> <p>On execution I am getting the following error:</p> <blockquote> <p>OpenCV Error: Bad argument (The total number of matrix elements is not divisible by the new number of rows) in cvReshape, file /build/buildd/opencv-2.3.1/modules/core/src/array.cpp, line 2755 terminate called after throwing an instance of 'cv::Exception' what(): /build/buildd/opencv-2.3.1/modules/core/src/array.cpp:2755: error: (-5) The total number of matrix elements is not divisible by the new number of rows in function cvReshape</p> <p>Aborted (core dumped)</p> </blockquote>
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