| CSS | Curvature Scale Space |
| HOG | Histogram of Orientation Gradients |
| SIFT | Scale-Invariant Feature Transform |
| FLANN | Fast Library for Approximate Nearest Neighbours |
| RANSAC | Random Sample Consensus |
| HOFT | Histogram of Orientation Gradients Combined with Feature Transform |
| MI | Mutual Information |
| NCC | Normalised Cross-Correlation |
| SURF | Speeded-Up Robust Features |
| PIIFD | Partial-Intensity Invariant Feature Descriptor |
| EAT | Enhanced Affine Transform |
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