I'm converting code from Matlab to C++, and one of the functions that I don't understand is imtransform. I need to "register" an image, which basically means stretching, skewing, and rotating my image so that it overlaps correctly with another image.
Matlab's imtransform does the registration for you, but as I'm programming this in C++ I need to know what's been abstracted. What is the normal math involved in image registration? How can I go from 2 arrays of data (which make up images) to 1 array, which is the combined image overlapped?
Raw C++ does not have any of the concepts you refer to built into it. However, there are many image processing libraries for C++ you can use that can do various transforms. DevIL and FreeImage should be able to do layering, as well as some transforms.