@InProceedings{RangayyanFerrDesaFrèr:2000:DiAnIm,
author = "Rangayyan, R. M. and Ferrari, R. J. and Desautels, J. E. L. and
Fr{\`e}re, A. F.",
title = "Directional analysis of images with Gabor wavelets",
booktitle = "Proceedings...",
year = "2000",
editor = "Carvalho, Paulo Cezar Pinto and Walter, Marcelo",
pages = "170--177",
organization = "Brazilian Symposium on Computer Graphics and Image Processing, 13.
(SIBGRAPI)",
publisher = "IEEE Computer Society",
address = "Los Alamitos",
note = "The conference was held in Gramado, RS, Brazil, from October 17 to
20.",
keywords = "wavelet transforms linear directional component analysis images
multiresolution representation Gabor wavelets Gabor filter
dictionary tuning frequency orientation redundancy reduction
filter responses Karhunen-Loeve transform thresholding principal
components Rose diagrams phase images oriented patterns mammogram
asymmetry feature extraction parametric statistical classifier
distortion cases Mini-MIAS database leave-one-out methodology
diagnostic accuracy.",
abstract = "The paper presents a new scheme for analysis of linear directional
components in images by using a multiresolution representation
based on Gabor wavelets. A dictionary of Gabor filters with
varying tuning frequency and orientation, specifically designed in
order to reduce the redundancy in the wavelet-based
representation, is applied to the given image. The filter
responses for different scales and orientation are analyzed by
using the Karhunen-Loeve (KL) transform and Otsu's (1979) method
of thresholding. The KL transform is applied to select the
principal components of the filter responses, preserving only the
most relevant directional elements appearing at all scales. The
first N principal components, thresholded by using Otsu's method,
are used to reconstruct the magnitude and phase of the directional
components of the image. Rose diagrams computed from the phase
images are used for quantitative and qualitativeanalysis of the
oriented patterns. The proposed scheme is applied to the analysis
of asymmetry between left and right mammograms. For this purpose,
a set of three features is extracted from the Rose diagrams and
used in a parametric statistical classifier. A total of 80 images
from 20 normal cases, 14 asymmetric cases, and 6 distortion cases
from the Mini-MIAS database were used to evaluate the scheme using
the leave-one-out methodology, resulting in an average diagnostic
accuracy of 72.5%.",
conference-location = "Gramado, RS, Brazil",
conference-year = "17-20 Oct. 2000",
doi = "10.1109/SIBGRA.2000.883910",
url = "http://dx.doi.org/10.1109/SIBGRA.2000.883910",
organisation = "SBC - Brazilian Computer Society",
ibi = "6qtX3pFwXQZeBBx/w5u9t",
url = "http://urlib.net/ibi/6qtX3pFwXQZeBBx/w5u9t",
targetfile = "170-177.pdf",
urlaccessdate = "2024, May 04"
}