Visual object recognition using daisy descriptor
Résumé
Visual content description is a key issue for the task of
machine-based visual object categorization (VOC). A good
visual descriptor should be both discriminative enough and
computationally efficient while possessing some properties
of robustness to viewpoint changes and lighting condition
variations. The recent literature has featured local image
descriptors, e.g. SIFT (Scale Invariant Feature Transform),
as the main trend in VOC. However, it is well known that
SIFT is computationally expensive and hardly scales when
the number of objects/concepts and learning data increase
significantly as the case in TRECVID. In this paper, we
investigate the DAISY, which is a new fast local descriptor
first introduced for wide baseline matching problem, in the
context of visual object recognition. We carefully evaluate
and compare the DAISY descriptor with SIFT both in terms
of performance and time complexity on two standard image
benchmarks – Caltech 101 and PASCAL VOC 2007. The
experimental results show that DAISY, while using shorter
descriptor length and operating 3 times faster, displays a
better recognition accuracy than SIFT. When displaying a
similar recognition accuracy to SIFT, DAISY can operate
12 times faster.