Feature Extraction and Image Processing for Computer Vision, 4th Edition

4.4. Localised feature extraction

There are two main areas covered here. The traditional approaches aim to derive local features by measuring specific image properties. The main target has been to estimate curvature: peaks of local curvature are corners, and analysing an image by its corners is especially suited to image of man-made objects. The second area includes more modern approaches that improve performance by employing region or patch-based analysis. We shall start with the more established curvature-based operators, before moving to the patch- or region-based analysis.

4.4.1. Detecting image curvature (corner extraction)

4.4.1.1. Definition of curvature

Edges are perhaps the low-level image features that are most obvious to human ...