EURASIP Journal on Image and Video Processing
Volume 2009 (2009), Article ID 959536, 10 pages
doi:10.1155/2009/959536
Review Article
Building Local Features from Pattern-Based Approximations of Patches: Discussion on Moments and Hough Transform
School of Computer Engineering, Nanyang Technological University, Blk N4, Nanyang Avenue, 639798, Singapore
Received 30 April 2008; Accepted 24 October 2008
Academic Editor: Simon Lucey
Copyright © 2009 Andrzej Sluzek. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The paper overviews the concept of using circular patches as local features for image description, matching, and retrieval. The contents of scanning circular windows are approximated by predefined patterns. Characteristics of the approximations are used as feature descriptors. The main advantage of the approach is that the features are categorized at the detection level, and the subsequent matching or retrieval operations are, thus, tailored to the image contents and more efficient. Even though the method is not claimed to be scale invariant, it can handle (as explained in the paper) image rescaling within relatively wide ranges of scales. The paper summarizes and compares various aspects of results presented in previous publications. In particular, three issues are discussed in detail: visual accuracy, feature localization, and robustness against “visual intrusions.” The compared methods are based on relatively simple tools, that is, area moments and modified Hough transform, so that the computational complexity is rather low.