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Opencv/cv.h file was cancelled in opencv4, I used opencv2/opencv.hpp instead,
but in PnPsolver.h and PnPsolver.cc, cvMat is used for svd calculation.
Because opencv2 cancels the definitions of cvMat and cvSVD, So if opencv4 is used, how to solve these problems?
I think you are using opencv3.4.1. There should be the same problem. How did you solve it?

Hello! I'm trying to build mono_inertial_euroc, but I get the following error:
I'm using Windows 10 with VirtualBox.

Error LNK2019 unresolved external symbol __imp_strerror referenced in function png_image_begin_read_from_file mono_inertial_euroc C:\Users\ivan\Source\Repos\ORB-SLAM3forWindows\build\libpng16_static.lib(pngread.obj) 1
Error LNK2001 unresolved external symbol __imp_strerror mono_inertial_euroc C:\Users\ivan\Source\Repos\ORB-SLAM3forWindows\build\libpng16_static.lib(pngwrite.obj) 1
Error LNK2019 unresolved external symbol __imp_ferror referenced in function png_image_write_to_file mono_inertial_euroc C:\Users\ivan\Source\Repos\ORB-SLAM3forWindows\build\libpng16_static.lib(pngwrite.obj) 1
Error LNK2019 unresolved external symbol __imp_remove referenced in function png_image_write_to_file mono_inertial_euroc C:\Users\ivan\Source\Repos\ORB-SLAM3forWindows\build\libpng16_static.lib(pngwrite.obj) 1
Error LNK2019 unresolved external symbol __imp_atof referenced in function png_get_sCAL mono_inertial_euroc C:\Users\ivan\Source\Repos\ORB-SLAM3forWindows\build\libpng16_static.lib(pngget.obj) 1
Error LNK2019 unresolved external symbol __imp___stdio_common_vsscanf referenced in function sscanf mono_inertial_euroc C:\Users\ivan\Source\Repos\ORB-SLAM3forWindows\build\jpeg.lib(jmemmgr.obj) 1
Error LNK2001 unresolved external symbol __CxxFrameHandler4 mono_inertial_euroc C:\Users\ivan\Source\Repos\ORB-SLAM3forWindows\build\g2o.lib(property.obj) 1
Error LNK2001 unresolved external symbol __CxxFrameHandler4 mono_inertial_euroc C:\Users\ivan\Source\Repos\ORB-SLAM3forWindows\build\g2o.lib(optimization_algorithm_with_hessian.obj) 1
Error LNK2001 unresolved external symbol __CxxFrameHandler4 mono_inertial_euroc C:\Users\ivan\Source\Repos\ORB-SLAM3forWindows\build\g2o.lib(robust_kernel_factory.obj) 1

how can I use downloaded data

Hi,
Can you please let me know what usleep function you added in the example?
Since I have got an error by defining the following usleep finction and also got an error in line 181 of mono_inertial_euroc.cc std::chrono::monotonic_clock::time_point time2 = std::chrono::monotonic_clock::now();: which it said "Error (active) E0304 no instance of function template "std::chrono::duration_cast" matches the argument list mono_inertial_euroc"

#include <windows.h>
void usleep(__int64 usec)
{
HANDLE timer;
LARGE_INTEGER ft;

ft.QuadPart = -(10*usec); // Convert to 100 nanosecond interval, negative value indicates relative time

timer = CreateWaitableTimer(NULL, TRUE, NULL); 
SetWaitableTimer(timer, &ft, 0, NULL, NULL, 0); 
WaitForSingleObject(timer, INFINITE); 
CloseHandle(timer); 

}

I would greatly appreciate it if you could help me.