Keyphrases
- sift descriptors
- projective invariants
- affine invariant
- scale invariant feature transform
- keypoints
- image transformations
- image matching
- sift features
- affine transformation
- discriminative power
- visual words
- image features
- global context
- invariant features
- bag of features
- machine learning
- feature points
- object recognition
- multiscale
- computational cost
- feature space
- feature extraction
- computer vision