Publications

This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.

Search for Publication


Year(s) from:  to 
Author:
Keywords (separated by spaces):

Local Features for Image Retrieval

L. Van Gool, T. Tuytelaars and A. Turina
State-of-the-Art in Content-Based Image and Video Retrieval
R. C. Veltkamp, H. Burkhardt and H-P. Kriegel, Ed.
Kluwer Academic Publishers, 2001

Abstract

Global image features, although quite successful for a surprisingly large number of queries, are nevertheless restricted in their usefulness. They are less effective when e.g. looking for other images that contain the same object or simply the same scene but seen from a very different viewpoint. Relative amounts of colour and texture typically change dramatically in such cases. Hence, more local features are needed as well, that capture local image structure in a way that is robust against changes in viewpoint and illumination. We propose affinely invariant regions. These are extracted from single images in isolation. Their image shapes are viewpoint dependent in that they systematically cover the same physical part of surfaces. These 'affinely invariant regions' work in principle perfectly for planar shapes under pseudo-orthographic viewing conditions. Keeping them small helps to fulfill these conditions. Several ways of extracting these regions are discussed. Next, features are extracted from the colour patterns within the regions. These are invariant under the geometric and photometric changes that are considered. As a consequence, they can be directly compared between images. This is the basis for our simple retrieval algorithm.


Download in postscript format
@InCollection{eth_biwi_00227,
  title = {Local Features for Image Retrieval},
  booktitle = {State-of-the-Art in Content-Based Image and Video Retrieval},
  pages = {21--41},
  year = {2001},
  publisher = {Kluwer Academic Publishers},
  keywords = {local features, affinely invariant regions, image retrieval}
}