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