Feature extraction
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Feature extraction is an area of image processing which involves using algorithms to detect and isolate various desired portions of a digitized image or video stream.
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Low-level
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)