Optimization of reprojection error in C++ - looking for solver

[zacniewski]

Hi Matt,
I'm working on C++ version of this code. Only optimization of reprojection error left to translate. Could you suggest C++ library that could help in this problem? I'm looking for solver to translate lines 731-748 into C++. I tried dlib, now struggling with Ceres Solver. Do you have any suggestion?

Best regards
Artur

[lhwcv]

@zacniewski Maybe nlopt is another choice. I'm also working on C++ version, but blocked by 'Powell' sorver in C++ , I have tried some other optimization methods, the result is not good. Any share in ceres?

[zacniewski]

Ceres Solver requires computing derivatives w.r.t. parameters. I can't do that and no one on Stack Overflow and Ceres Google group could help me. But I found PRAXIS, which seems to be C++ equivalent of method used by Matt - https://people.sc.fsu.edu/~jburkardt/cpp_src/praxis/praxis.html
I modified code of praxis to my needs and it seems to work properly.

[starseeker]

Hi! Wanted to ask - is the C++ version of this code you're working on also open source? I didn't see it on github, so I wasn't sure...

Also, would the work in the https://github.com/ZiqianXie/page_dewarp branch be helpful for getting off the Powell solver?