SIFT and Beyond =============== With the enormous succes of SIFT came a lot of papers that tried to improve upon it (and to circumvent the patent on SIFT). Viola and Jones Face Detection ------------------------------ - Not really a replacement for SIFT as it detects faces (but uses techniques that became famous, e.g. in SURF). - `V&J (pdf) `_ Speeded up Robust Features -------------------------- - `Wikipedia `_ - `SURF (pdf) `_ Local Binary Patterns --------------------- - An alternative for the descriptor. - The idea of using gradients taking to the extreme - `LBP (wikipedia) `_ Brief ----- - An alternative for the descriptor. - The idea of using gradients taking to the extreme - `Brief (pdf) `_ FAST ---- - a way to detect keypoints in images based on corner detection - adhoc way to define and detect corners... - can be used in scale space to detect scale invariant keypoints (variation AGAST). - `pdf `_ ORB --- - FAST (with orientation) + BRIEF - `ORB (pdf) `_ BRISK ----- - LBP like but with a retina like sampling of the descriptor neighborhood - `Brisk (pdf) `_ Freak ----- - Yet another LBP like descriptor - Again refering to the human eye sampling pattern - `(pdf) `_ Deep Convolutional Descriptor Learning -------------------------------------- - Of course... - `web `_ - `pdf `_ - Siamese network in learning, single network when running