I have the following code :
cv::Mat temp0 = R.t();
cv::Mat temp1 = R * temp0;
cv::Mat temp2(960, 960, CV_32FC1);
temp2 = temp1.inv();
cv::Size s = temp1.size();
std::cout<<s.height<<" "<<s.width<<std::endl;
std::cout<<cv::format(temp1, "numpy" ) << std::endl;
std::cout<<cv::format(temp2, "numpy" ) << std::endl;
The Transpose works correctly, so does the matrix multiplication. Thus the Mat temp1 has a size of 960x960. However, when I do temp2 =temp1.inv(), I recieve all zeroes in temp2. I mean zeroes is all of the 960x960 cells. Also, R is of type CV_32FC1 only. So it is probably not a datatype issue. I cannot understand the issue here. I googled so much. Can you please help.
EDIT
I am copying below the gdb output for the Mat::inv() function. I am having a hard time figuring it all out, but if someone is more familiar with opencv, maybe it will be of help :)
Breakpoint 1, CreateShares::ConstructShares (this=0x80556d0, channel=..., k=2, n=4) at CreateShares.cpp:165
165 temp2 = temp1.inv();
(gdb) step
cv::Mat::operator= (this=0xbffff294, e=...) at /usr/include/opencv2/core/mat.hpp:1373
1373 e.op->assign(e, *this);
(gdb)
1374 return *this;
(gdb) step
1375 }
(gdb) step
cv::MatExpr::~MatExpr (this=0xbfffef64, __in_chrg=<optimized out>) at /usr/include/opencv2/core/mat.hpp:1167
1167 class CV_EXPORTS MatExpr
(gdb) step
cv::Mat::~Mat (this=0xbfffefdc, __in_chrg=<optimized out>) at /usr/include/opencv2/core/mat.hpp:295
295 release();
(gdb) step
cv::Mat::release (this=0xbfffefdc) at /usr/include/opencv2/core/mat.hpp:381
381 if( refcount && CV_XADD(refcount, -1) == 1 )
(gdb) step
383 data = datastart = dataend = datalimit = 0;
(gdb) step
384 size.p[0] = 0;
(gdb) step
385 refcount = 0;
(gdb) step
386 }
(gdb) step
cv::Mat::~Mat (this=0xbfffefdc, __in_chrg=<optimized out>) at /usr/include/opencv2/core/mat.hpp:296
296 if( step.p != step.buf )
(gdb) step
298 }
(gdb) step
cv::Mat::~Mat (this=0xbfffefa4, __in_chrg=<optimized out>) at /usr/include/opencv2/core/mat.hpp:295
295 release();
(gdb) step
cv::Mat::release (this=0xbfffefa4) at /usr/include/opencv2/core/mat.hpp:381
381 if( refcount && CV_XADD(refcount, -1) == 1 )
(gdb) step
383 data = datastart = dataend = datalimit = 0;
(gdb) step
384 size.p[0] = 0;
(gdb) step
385 refcount = 0;
(gdb) step
386 }
(gdb) step
cv::Mat::~Mat (this=0xbfffefa4, __in_chrg=<optimized out>) at /usr/include/opencv2/core/mat.hpp:296
296 if( step.p != step.buf )
(gdb) step
298 }
(gdb) step
cv::Mat::~Mat (this=0xbfffef6c, __in_chrg=<optimized out>) at /usr/include/opencv2/core/mat.hpp:295
295 release();
(gdb) step
cv::Mat::release (this=0xbfffef6c) at /usr/include/opencv2/core/mat.hpp:381
381 if( refcount && CV_XADD(refcount, -1) == 1 )
(gdb) step
383 data = datastart = dataend = datalimit = 0;
(gdb) step
384 size.p[0] = 0;
(gdb) step
385 refcount = 0;
(gdb) step
386 }
(gdb) step
cv::Mat::~Mat (this=0xbfffef6c, __in_chrg=<optimized out>) at /usr/include/opencv2/core/mat.hpp:296
296 if( step.p != step.buf )
(gdb) step
298 }
(gdb) step
CreateShares::ConstructShares (this=0x80556d0, channel=..., k=2, n=4) at CreateShares.cpp:167
167 cv::Size s = temp1.size();
(gdb) step
cv::Mat::MSize::operator() (this=0xbffff284) at /usr/include/opencv2/core/mat.hpp:705
705 return Size(p[1], p[0]);
(gdb) step
cv::Size_<int>::Size_ (this=0xbffff2f8, _width=960, _height=960) at /usr/include/opencv2/core/operations.hpp:1624
1624 : width(_width), height(_height) {}
(gdb) step
cv::Mat::MSize::operator() (this=0xbffff284) at /usr/include/opencv2/core/mat.hpp:706
706 }
(gdb) step