# How to get the SIFT features of an image?

According to the documentation, the function KeyPoints[] computes features only using SURF, but what about SIFT or FAST features?

• SIFT is patented. FAST is rather special-purpose, focusing only on corner detection. Those are IMO the most probable reasons why these algorithms have not been implemented. – Oleksandr R. Jan 5 '15 at 1:56
• @OleksandrR as the user mentions SURF is patented too... – M.R. Nov 3 '15 at 16:16