Results 221 to 230 of about 20,905 (259)

Ensemble of shape descriptors for shape retrieval and classification

International Journal of Advanced Intelligence Paradigms, 2014
Shape classification has long been a field of study in computer vision. In this work, we propose an ensemble of approaches using the weighted sum rule that is based on a set of widely used shape descriptors inner-distance shape context, shape context, and height functions. Features are obtained by transforming these shape descriptors into a matrix from
Loris Nanni, LUMINI, ALESSANDRA, Sheryl Brahnam   +2 more
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Molecular Shape Descriptors

1983
This section reviews the molecular shape descriptors developed by Amoore, Allinger, Simon et al. and Testa and Purcell. The illustrative examples discussed refer to the odour similarity and cardiotoxic aglycones. One has stressed the methods based on the reference structure because, correctly formulated, these methods seem to offer promising ...
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THE NORMALIZED WAVELET DESCRIPTOR FOR SHAPE RETRIEVAL

International Journal of Wavelets, Multiresolution and Information Processing, 2008
In many image analysis applications, such as image retrieval, the shape of an object is of primary importance. In this paper, a new shape descriptor, namely the Normalized Wavelet Descriptor (NWD), which is a generalization and extension of the Wavelet Descriptor (WD), is introduced.
Kimcheng Kith, Barend J. van Wyk, Michaël A. van Wyk   +2 more
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Shape Discrimination Using Fourier Descriptors

IEEE Transactions on Systems, Man, and Cybernetics, 1977
Description or discrimination of boundary curves (shapes) is an important problem in picture processing and pattern recognition Fourier descriptors (FD's) have interesting properties in this respect. First, a critical review is given of two kinds of FD's.
Eric Persoon, King-Sun Fu
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A Review of Shape Descriptors for Document Analysis

Ninth International Conference on Document Analysis and Recognition (ICDAR 2007), 2007
In this paper we review some of shape descriptors proposed in the last years. We propose the definitions of descriptor and primitive and introduce the notion of feature extraction method. With these definitions, we propose a new classification of shape descriptors according to their properties pointing out their strengths and weaknesses.
Ramos Terrades, Oriol, Tabbone, Salvatore, Valveny, Ernest   +2 more
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Affine invariant shape descriptors: The ICA-Fourier descriptor and the PCA-Fourier descriptor

2008 19th International Conference on Pattern Recognition, 2008
In this paper, we propose two new affine invariant shape descriptors, the ICA-Fourier descriptor and the PCA-Fourier descriptor. We tested the descriptors by using them as features for shape based silhouette image retrieval. Experiments on a 1000 silhouette image database show promising retrieval rates of 95.41% and 93.63%, using the ICA-Fourier ...
Ye Mei, Dimitrios Androutsos
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Novel Shape Descriptors for Molecular Graphs

Journal of Chemical Information and Computer Sciences, 2001
We report on novel graph theoretical indices which are sensitive to the shapes of molecular graphs. In contrast to the Kier's kappa shape indices which were based on a comparison of a molecular graph with graphs representing the extreme shapes, the linear graph and the "star" graph, the new shape indices are obtained by considering for all atoms the ...
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Distribution-Based Descriptors of the Molecular Shape

Journal of Chemical Information and Modeling, 2005
A rational design of economically cost-effective chemical libraries as well as successful data mining during a process of drug discovery employs a vast array of the molecular descriptors. Despite the huge importance of this area of the research there is still a need for the further development of the simple, intuitive, easily calculable, specific and ...
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Self-closed partial shape descriptor for shape retrieval

2012 19th IEEE International Conference on Image Processing, 2012
We propose a discriminative partial-based algorithm for shape recognition and retrieval. A key distinction of our approach is that we use pairwise geometric relations between contour fragments containing important and salient shape information to establish self-closed partial descriptor (SCPD), it can capture similar local parts in matching shape ...
Huijie Fan, Yang Cong, Yandong Tang
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Deformable HOG-Based Shape Descriptor

2013 12th International Conference on Document Analysis and Recognition, 2013
In this paper we deal with the problem of recognizing handwritten shapes. We present a new deformable feature extraction method that adapts to the shape to be described, dealing in this way with the variability introduced in the handwriting domain. It consists in a selection of the regions that best define the shape to be described, followed by the ...
Jon Almazán, Alicia Fornés, Ernest Valveny   +2 more
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