Feature extraction: Difference between revisions

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#REDIRECT[[Feature engineering]]
'''Feature extraction''' is an area of [[image processing]] which involves using [[algorithm]]s 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===
 
===[[Hough transform]]===
*Lines
*Circles/Ellipses
*Arbitrary shapes (Generalized Hough Transform)
 
==Flexible methods==
*Deformable, parameterized shapes
*Active contours (snakes)