Feature Extraction

Low-level

• Edge detection
• Scale invariant feature transform

Curvature

• Edge direction, changing intensity, autocorrelation

Image motion

• Area based, differential approach. Optical flow.

Shape Based

Thresholding

Template matching

Hough transform

• Lines
• Circles/Ellipses
• Arbitrary shapes (Generalized Hough Transform)

Flexible methods

• Deformable, parameterized shapes
• Active contours (snakes)

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