Noise estimation sometimes goes out-of-bounds

[tjof2]

Offending line no. 77 in noise.hpp - robust means and variance arrays are sometimes too small compared to the number of patches resulting from the quadtree segmentation:

// Perform quadtree decomposition of frames
// to generate patches for noise estimation
int maxVsize = (Nx/size)*(Ny/size);
arma::vec means = -1 * arma::ones<arma::vec>(T*maxVsize);
arma::vec vars = -1 * arma::ones<arma::vec>(T*maxVsize);

Current "fix" on line 84 doesn't always help - still get an Armadillo error on some noise estimation problems. Thanks to @bm424 for reminding me.

[tjof2]

Simplest fix is to over-compensate with the array size by replacing int maxVsize = (Nx/size)*(Ny/size) with int maxVsize = (Nx*Ny), since the code subsequently deletes all irrelevant elements anyway (I couldn't think of a smarter way around this at the time, and I'm sure the actual problem is not line no. 77 but another one - but this should fix it anyway).