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.
The following is just a list of subject headings to be filled in later
- Template operations & Fourier Transforms
Low-level
Edge detection
- 1st order: Prewitt, Sobel, Canny, Spacek
- 2nd Order: Laplacian, Marr-Hildreth
Curvature
- Edge direction, changing intensity, autocorrelation
Image motion
- Area based, differential approach. Optical flow.
Shape Based
Thresholding
Template matching
- Lines
- Circles/Ellipses
- Arbitrary shapes (Generalized Hough Transform)
Flexible methods
- Deformable, parameterized shapes
- Active contours (snakes)