This repository is split into two different parts. The general functionality is mostly the same between the two (SIFT for keypoint detection, RANSAC for robustness to outliers). The largest difference is that a homography (unlike an affine transformation) can not be solved with the pseudo-inverse, so SVD of the homogeneous matrix is necessary to estimate a transformation. Other than the use of the homogeneous matrix and SVD, both algorithms are pretty much the same, so the code between them is very similar.
Examples:
