Images as Sets of Locally Weighted Features
Teo de Campos, Gabriela Csurka and Florent Perronnin
University of Surrey, Guildford, UK.
This paper presents a generic framework in which images are modelled as order-less sets of weighted visual features. Each visual feature is associated with a weight factor that may inform its relevance. This framework can be applied to various bag-of-patches approaches such as the bag-of-visual-word or the Fisher kernel representations. We suggest that if dense sampling is used, dierent schemes to weight local features can be evaluated, leading to results that are often better than the combination of multiple sampling schemes, at a much lower computational cost, because the features are extracted only once. This allows our framework to be a test-bed for saliency estimation methods in image categorisation tasks.
We explored two main possibilities for the estimation of local feature relevance. The first one is based on the use of saliency maps obtained from human feedback, either by gaze tracking or by mouse clicks. The method is able to prot from such maps, leading to a significant improvement in categorisation performance. The second possibility is based on automatic saliency estimation methods, including Itti&Koch's method and the SIFT's DoG. We evaluated the proposed framework and saliency estimation methods using an in house dataset and the PASCAL VOC 2008/2007 dataset, showing that some of the saliency estimation methods lead to a significant performance improvement in comparison to the standard unweighted representation.
|EPrint Type:||Monograph (Technical Report)|
|Additional Information:||Another version of this manuscript has been submitted to the CVIU on 27 November 2009.|
|Project Keyword:||Project Keyword UNSPECIFIED|
|Deposited By:||Teo de Campos|
|Deposited On:||02 July 2011|