In this paper we present a new method to group self-similar SIFT features in images. The aim is to automatically build groups of all SIFT features with the same semantics in an image. To achieve this a new distance between SIFT feature vectors taking into account their orientation and scale is introduced. The methods are presented in the context of recognition of buildings. A first evaluation s...

Bag-of-words model is implemented and tried on 10-class visual concept detection problem. The experimental results show that “DURF+ERT+SVM” outperforms “SIFT+ERT+SVM” both in detection performance and computation efficiency. Besides, combining DURF and SIFT results in even better detection performance. Real-time object detection using SIFT and RANSAC is also tried on simple objects, e.g. drink ...

Kurzfassung. Zur Bestimmung von Bildähnlichkeiten werden häufig charakteristische Punkte berechnet. Ein bewährtes Verfahren zur Extraktion solcher Punkte ist die Scale Invariant Feature Transform (SIFT). Gerade auf medizinischen Grauwertbildern liefert dieses Verfahren aber unbefriedigende Ergebnisse. In dieser Arbeit wird ein neuer Ansatz vorgestellt, mit dem auch strukturelle Informationen üb...

Natural Image Mosaicing based on Redundant Keypoint Elimination Method in SIFT algorithm and Adaptive RANSAC method

This study proposes augmented reality as a tool to access Internet information from mobile devices and prototypes for markerless outdoor augmented reality application based on SIFT (Scale Invariant Feature Transform) features are implemented. They comprise a reference data set of SIFT points extracted from images of the square Place des Terreaux in Lyons. These SIFT features are projected on a ...

Selected ion flow tube – mass spectrometry (SIFT-MS) is based on chemical reactivity of analytes with reactant ions. The complete understanding all the ion–molecule reactions key to deployment this technology for direct and rapid analysis VOCs in gas phase. In present work, we focused carboxylic acids esters, compounds involved many biochemical processes. negative precursor ions (OH–, O●−, O2●−...

RATIONALE It has been proposed that malondialdehyde (MDA) reflects free oxygen-radical lipid peroxidation and can be useful as a biomarker to track this process. For the analysis of MDA molecules in humid air by selected ion flow tube mass spectrometry (SIFT-MS), the rate coefficients and the ion product distributions for the reactions of the SIFT-MS reagent ions with volatile MDA in the presen...

First of all, we downloaded 8 directories from Caltech 101, and used “sift.m” as a function by David Lowe to get SIFT descriptors from each image. However, it took almost forever when we used 8 directories. Therefore, we ended up using only 3 directories: anchors, elephants, and helicopters. By using function ‘sift’ we gathered many descriptors for each image. Some of the images and their SIFT ...

Matching feature points between images is one of the most fundamental issues in computer vision tasks. As the number of feature points increases, the feature matching rapidly becomes a bottleneck. In this paper, a novel method is presented to accelerate features matching by two modifications of the popular SIFT algorithm. The first modification is based on splitting the SIFT features into two t...

The paper proposes the modified-SIFT algorithm which will be a modified form of the scale invariant feature transform. The modification consists of considering successive groups of 8 rows of pixel, along the height of the image. These are used to construct 8 bin histograms for magnitude as well as orientation individually. As a result the number of feature descriptors is significantly less (95%...