a specific implementation of Features - Feature Functions but used on images

image feature is an interesting part of an image
image feature detection is a low-level image processing operation that examines every pixel to see if there is a feature present at that pixel
image feature detector is an implementation of image feature detection

Image Feature Types

Image Feature Detectors - Basic Algorithms

Image Feature detector	Edge	Corner	Blob	Ridge
Canny	✔	✘	✘	✘
Sobel	✔	✘	✘	✘
Scharr	✔	✘	✘	✘
Laplacian	✔	✘	✘	✘
Kayyali	✔	✘	✘
Prewitt	✔	✘	✘
Deriche	✔	✘	✘
Differential	✔	✘	✘
Roberts Cross	✔	✘	✘
Harris & Stephens / Plessey / Shi–Tomasi	✔	✔	✘
SUSAN	✔	✔	✘
Hessian Feature Strength Measures		✔
Harris Operator		✔
Shi & Tomasi	✘	✔	✘
Level Curve Curvature	✘	✔	✘
FAST	✘	✔	✔
Laplacian of Gaussian (LoG)	✘	✔	✔
Difference of Gaussians (DoG)	✘	✔	✔
Determinant of Hessian (DoH)	✘	✔	✔
Maximally Stable External Regions (MSER)	✘	✘	✔
Principal Curvature-Based Region (PCBR)	✘	✘	✔
Grey-Level blobs	✘	✘	✔

Feature detector	What it Detects
Hough Transform	detecting simple shapes such as circles, lines etc in an image
Scale-Invariant Feature Transform (SIFT)	robust feature matching across different views or conditions